Roy Johnsen

About

Information about myself

After receiving a Dr.ing. degree from NTH in 1984, I joined Statoil Research Centre in Trondheim in 1985 to work within their “Material Technology” group. During this period I was involved in several research projects, material selection activities for new fields and failure analysis for existing fields. I also worked as Department Manager for some years.

In 1991 I joined CorrOcean in a combined management/technical position to develop the company from a small national company to be a leading international company within “Corrosion monitoring and corrosion management”. During my 13 years with CorrOcean the company grew from 30 people to 350 people with activities in all the major oil regions in the world. I also got the opportunity to visit the most important regions with oil activities in the world including Asia, Australia , South America, North America and Europe working with the leading oil companies and supplier industry. During my years in CorrOcean the company was listed on the Oslo Stock Exchange.

After 20 years in oil industry I accepted an offer to be a Professor within “Corrosion and Surface Technology” at IPM in 2004. I still have good contact with the industry and use my contact and experience to develop my courses and to get interesting industrial related projects both for master students and for PhD candidates.

I am present manager for the Strategic Area Materials (Tematisk Satsingsområde Materialer) at NTNU.

Fields of interest

Material technology for the oil industry
Corrosion of metallic materials for the process industry
Corrosion protection by cathodic protection and/or coating
Corrosion, erosion and wear resistant materials and surfaces
Tribology (including tribo-corrosion)
Integrity management of production systems
Hydrogen embrittlement of metals

Research

In the following is given a short presentation of the main research projects I’m involved in:

HISC - Hydrogen induced stress cracking of stainless steels
(2005 – 2011) JIP sponsored by Statoil, ConocoPhillips, Total, Shell, Petrobras, Chevron and supply industry.

Prevention of hydrogen induced stress cracking (HISC) in subsea pipelines and production systems made from stainless steels
(2006- 2012) Project sponsored by the Norwegian Research Council through the Petromaks program.

NODE Advanced Riser Tensioning project
(2007-2010) Project sponsored by the Norwegian Research Council through the Petromaks program together with National Oilwell Varco, Aker Solutions Maritime Hydraulics, Bosch Rexroth, Umoe Mandal, Statoil.

Pulsed plasma surface treatment (PPST) – effect on hydrogen embrittlement and hydrogen absorption and diffusion
(2009-2012) JIP sponsored by Total, Aker Solutions, FMC Kongsberg and MoTECH Plasma.

Smartpipe
(2006-2010) Project sponsored by the Norwegian Research Council through the Petromaks program together with oil companies and service industry.

NOWITECH – Norwegian Research Centre for OffshoreWind (2009-2015) FME sponsored by The Norwegian Research Council and the industry. Participating in activities related to optimization of maintenance including coating technology.

Courses

TMM4100 / TMM4105 - Materialteknikk
TMM4170 / TMT4255 - Corrosion and corrosion protection
TMM4205 - Tribology and Surface technology
TMM4535 - Robust material selection and design – offshore applications

Publications

2023

Karimi, Shabnam; Taji, Iman; Hajilou, Tarlan; Palencsar, Simona; Dugstad, Arne; Barnoush, Afrooz; Verbeken, Kim; Depover, Tom; Johnsen, Roy. (2023) Role of cementite morphology on corrosion layer formation of high-strength carbon steels in sweet and sour environments. Corrosion Science. volum 214.
Academic article
Karimi, Shabnam; Taji, Iman; Palencsar, Simona; Dugstad, Arne; Hajilou, Tarlan; Barnoush, Afrooz; Verbeken, Kim; Johnsen, Roy; Depover, Tom. (2023) Evaluation of microstructural and environmental effects on the hydrogen uptake and desorption in high-strength carbon steels: A thermal desorption spectroscopy study. Corrosion Science. volum 219.
Academic article
Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2023) Experimental comparison of gaseous and electrochemical hydrogen charging in X65 pipeline steel using the permeation technique. Corrosion Science. volum 215.
Academic article
Lu, Xu; Kattuputhur Soundararajan, Chandrahaasan; Wang, Dong; Johnsen, Roy. (2023) Failure investigation of Alloy 725 drive screw. 2023.
Report

2022

Hornus, Edgar; Vouilloz, Francisco; Long, Yu; Andersen, Kjetil; Krosness, Ola; King, Mike; Johnsen, Roy; Salasa, Mobin; Iannuzzi, Mariano. (2022) Growth Kinetics of Calcareous Deposits on Thermally Sprayed Aluminum Coatings in Natural Seawater. Corrosion. volum 78 (12).
Academic article
Karimi, Shabnam; Taji, Iman; Hajilou, Tarlan; Barnoush, Afrooz; Johnsen, Roy. (2022) Evaluation of the cementite morphology influence on the hydrogen induced crack nucleation and propagation path in carbon steels. International Journal of Hydrogen Energy. volum 47 (30).
Academic article
Lu, Xu; Depover, Tom; Johnsen, Roy. (2022) Evaluation of hydrogen diffusion and trapping in nickel Alloy 625 by thermal desorption spectroscopy. International Journal of Hydrogen Energy. volum 47 (74).
Academic article
Lu, Xu; Díaz, Andrés; Ma, Jun; Wang, Dong; He, Jianying; Zhang, Zhiliang; Johnsen, Roy. (2022) The effect of plastic deformation on hydrogen diffusion in nickel Alloy 625. Scripta Materialia. volum 226.
Academic article
Lu, Xu; Ma, Yan; Peng, Ding; Johnsen, Roy; Wang, Dong. (2022) In situ nanomechanical characterization of hydrogen effects on nickel-based alloy 725 under different metallurgical conditions. Journal of Materials Science & Technology. volum 135.
Academic article
Lu, Xu; Wang, Dong; Johnsen, Roy. (2022) Hydrogen diffusion and trapping in nickel-based alloy 625: An electrochemical permeation study. Electrochimica Acta. volum 421.
Academic article
Lu, Xu; Wang, Dong; Wan, Di; Guo, Xiaofei; Johnsen, Roy. (2022) Reveal hydrogen behavior at grain boundaries in Fe-22Mn-0.6C TWIP steel via in-situ micropillar compression test. Acta Metallurgica Sinica (English Letters).
Academic article
Maicas Esteve, Héctor; Taji, Iman; Wilms, Marc; Gonzalez-Garcia, Yaiza; Johnsen, Roy. (2022) Corrosion and Microstructural Investigation on Additively Manufactured 316L Stainless Steel: Experimental and Statistical Approach. Materials. volum 15 (4).
Academic article
Skilbred, Ellen Synnøve; Palencsar, Simona; Dugstad, Arne; Johnsen, Roy. (2022) Hydrogen uptake during active CO2-H2S corrosion of carbon steel wires in simulated annulus fluid. Corrosion Science. volum 199.
Academic article
Taji, Iman; Hajilou, Tarlan; Ebner, Anna Sophie; Scheiber, Daniel; Karimi, Shabnam; Plesiutschnig, Ernst; Ecker, Werner; Barnoush, Afrooz; Maier-Kiener, Verena; Johnsen, Roy; Razumovskiy, Vsevolod I.. (2022) Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying. Corrosion Science. volum 203.
Academic article
Taji, Iman; Hajilou, Tarlan; Karimi, Shabnam; Schott, Florian; Plesiutschnig, Ernst; Barnoush, Afrooz; Johnsen, Roy. (2022) Role of grain boundaries in hydrogen embrittlement of alloy 725: single and bi-crystal microcantilever bending study. International Journal of Hydrogen Energy. volum 47 (25).
Academic article
Wang, Dong; Hagen, Anette Brocks; Undrum Fathi, Pernille; Lin, Meichao; Johnsen, Roy; Lu, Xu. (2022) Investigation of hydrogen embrittlement behavior in X65 pipeline steel under different hydrogen charging conditions. Materials Science & Engineering: A. volum 860.
Academic article

2021

Parow, Hanna; Johnsen, Roy; Skovhus, Torben Lund. (2021) MIC in the Fire Water Sprinkler System at St. Olavs Hospital, Trondheim, Norway. Failure Analysis of Microbiologically Influenced Corrosion.
Academic chapter/article/Conference paper
Skilbred, Ellen Synnøve; Kappes, Mariano; Iannuzzi, Mariano; Johnsen, Roy. (2021) Hydrogen uptake and diffusivity in steel armor wires with different chemical composition, carbide distribution, grain size, and degree of deformation. Materials and corrosion - Werkstoffe und Korrosion. volum 73 (3).
Academic article
Torres Rodriguez, Cristian; Johnsen, Roy; Iannuzzi, Mariano. (2021) Crevice corrosion of solution annealed 25Cr duplex stainless steels: Effect of W on critical temperatures. Corrosion Science. volum 178.
Academic article
Wang, Dong; Hagen, Anette Brocks; Wan, Di; Lu, Xu; Johnsen, Roy. (2021) Probing hydrogen effect on nanomechanical properties of X65 pipeline steel using in-situ electrochemical nanoindentation. Materials Science & Engineering: A. volum 824.
Academic article
Wang, Dong; Lu, Xu; Lin, Meichao; Wan, Di; Li, Zhiming; He, Jianying; Johnsen, Roy. (2021) Understanding the hydrogen effect on pop-in behavior of an equiatomic high-entropy alloy during in-situ nanoindentation. Journal of Materials Science & Technology. volum 98.
Academic article
Wang, Dong; Lu, Xu; Wan, Di; Guo, Xiaofei; Johnsen, Roy. (2021) Effect of hydrogen on the embrittlement susceptibility of Fe-22Mn-0.6C TWIP steel revealed by in-situ tensile tests. Materials Science & Engineering: A. volum 802.
Academic article

2020

Lervik, Adrian; Walmsley, John; Lodgaard, Lars; Marioara, Calin Daniel; Johnsen, Roy; Lunder, Otto; Holmestad, Randi. (2020) Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy. Metals. volum 10 (9).
Academic article
Skilbred, Ellen Synnøve; Lootz, Signe Aarthun; Johnsen, Roy. (2020) Hydrogen Embrittlement Susceptibility of Steel Armor Wires for Flexible Pipes. International Corrosion Conference Series.
Academic article
Stenerud, Gaute; Hajilou, Tarlan; Olsen, Jim Stian; Taji, Iman; Barnoush, Afrooz; Johnsen, Roy. (2020) The Effect of Hydrogen on the Nanoindentation Behavior of Heat Treated 718 Alloy. Metals. volum 10 (11).
Academic article
Torres Rodriguez, Cristian; Hazarabedian, Maria Sofia; Quadir, Zakaria; Johnsen, Roy; Iannuzzi, Mariano. (2020) The Role of Tungsten on the Phase Transformation Kinetics and its Correlation with the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels. Journal of the Electrochemical Society. volum 167 (8).
Academic article
Torres Rodriguez, Cristian; Iannuzzi, Mariano; Johnsen, Roy. (2020) Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels. Metals. volum 10 (10).
Academic article

2019

Ingdal, Mats; Johnsen, Roy; Harrington, David A.. (2019) The Akaike information criterion in weighted regression of immittance data. Electrochimica Acta. volum 317.
Academic article
Johnsen, Roy; Gjelseng, Linn Cecilie; Heimsæter, Martin Arne; Jernberg, Anders; Qvale, Atle H. (2019) Influence of Manufacturing Process and Resulting Microstructure on HISC Susceptibility of 25Cr Duplex Stainless Steel Pipe. International Corrosion Conference Series.
Academic article
Johnsen, Roy; Olavesen, Henrik Horten; Hossein Zavieh, Amin; Erlien, Tomas Laugsand. (2019) Effect of cathodic polarization on localized corrosion of 25Cr in seawater. International Corrosion Conference Series. volum 2019-March.
Academic article
Kheradmand, Nousha; Rogne, Bjørn Rune Sørås; Dumoulin, Stephane; Deng, Yun; Johnsen, Roy; Barnoush, Afrooz. (2019) Small scale testing approach to reveal specific features of slip behavior in BCC metals. Acta Materialia. volum 174.
Academic article
Stefansson, Njall; Dunn, John; Strand, Einar; Johnsen, Roy; Heimsæter, Martin Arne. (2019) Performance of high strength UNS N08830 in hydrogen stress crack testing to simulate conditions arising from subsea cathodic protection. International Corrosion Conference Series. volum 2019-March.
Academic article
Torres Rodriguez, Cristian; Johnsen, Roy; Østvold, Hege Kokslien; Bernås, Mia; Iannuzzi, Mariano. (2019) Effect ofW on Phase Transformation Kinetics and its Correlation with Localized Corrosion Resistance for UNS S39274. International Corrosion Conference Series. volum 2019-March.
Academic article
Wilson, Håvard; Johnsen, Roy; Torres Rodriguez, Cristian; Hesjevik, Sven Morten. (2019) Properties of TSA in natural seawater at ambient and elevated temperature. Materials and corrosion - Werkstoffe und Korrosion. volum 70 (2).
Academic article

2018

Bernås, Mia; Westermann, Ida; Johnsen, Roy; Torres Rodriguez, Cristian; Jernberg, Anders; Qvale, Atle H; Iannuzzi, Manuela. (2018) Effect of tungsten on the precipitation kinetics and localized corrosion resistance of super duplex stainless steels. International Corrosion Conference Series. volum 2018-April.
Academic article
Hajilou, Tarlan; Hope, Malin Sofie B.; Hossein Zavieh, Amin; Kheradmand, Nousha; Johnsen, Roy; Barnoush, Afrooz. (2018) In situ small-scale hydrogen embrittlement testing made easy: An electrolyte for preserving surface integrity at nano-scale during hydrogen charging. International Journal of Hydrogen Energy. volum 43 (27).
Academic article
Husby, Hans; Iannuzzi, Mariano; Johnsen, Roy; Mariano, Kappes; Barnoush, Afrooz. (2018) Effect of nickel on hydrogen permeation in ferritic/ pearlitic low alloy steels. International Journal of Hydrogen Energy. volum 43 (7).
Academic article
Husby, Hans; Wagstaff, Philip Haakon; Iannuzzi, Mariano; Johnsen, Roy; Kappes, Mariano A. (2018) Effect of Nickel on the Hydrogen Stress Cracking Resistance of Ferritic/Pearlitic Low Alloy Steels. Corrosion. volum 74 (7).
Academic article
Johnsen, Roy; Lange, Torstein; Stenerud, Gaute; Olsen, Jim Stian. (2018) Environmentally assisted degradation of spinodal copper alloy C72900. Corrosion Science. volum 142.
Academic article
Krogstad, Hedda Nordby; Johnsen, Roy; Coey, Michael. (2018) Effect of a time-dependent magnetic field on the corrosion of Ni-Al bronze. Corrosion. volum 74 (3).
Academic article
Krogstad, Hedda Nordby; Johnsen, Roy; Coey, Michael. (2018) Effect of a uniform magnetic field on corrosion of Ni-Al bronze in 3.5wt% NaCl. Corrosion. volum 74 (2).
Academic article
Ryen, Audun; Johnsen, Roy; Iannuzzi, Mariano; Årtun, Lars. (2018) Cathodic protection by distributed sacrificial anodes - Performance at elevated temperature and in mud. International Corrosion Conference Series. volum 2018-April.
Academic article
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian. (2018) Hydrogen stress cracking and crack initiation in precipitation hardened Ni-alloys. Engineering Failure Analysis. volum 89.
Academic article
Stenerud, Gaute; Wenner, Sigurd; Olsen, Jim Stian; Johnsen, Roy. (2018) Effect of different microstructural features on the hydrogen embrittlement susceptibility of alloy 718. International Journal of Hydrogen Energy. volum 43 (13).
Academic article
Torres Rodriguez, Cristian; Kappes, Mariano A; Johnsen, Roy; Iannuzzi, Mariano. (2018) Influence of tungsten on passivity breakdown and repassivation of 25CR super duplex stainless steel. International Corrosion Conference Series. volum 2018-April.
Academic article
Wold, Kristian; Johnsen, Roy; Iannuzzi, Mariano; Årtun, Lars. (2018) Integrated cathodic protection (CP) sensor network development of the CP sensor. International Corrosion Conference Series. volum 2018-April.
Academic article

2017

Bernås, Mia; Westermann, Ida; Johnsen, Roy; Lauritsen, Christian; Iannuzzi, Mariano. (2017) Effect of microstructure on the corrosion resistance of duplex stainless steels: Materials performance maps. International Corrosion Conference Series. volum 8.
Academic article
Farhat, Hanan; Johnsen, Roy. (2017) Hydrogen sulfide tube failure in a seawater heat exchanger. Materials performance. volum 56 (9).
Academic article
Haugan, Eirik; Næss, Monika; Torres Rodriguez, Cristian; Johnsen, Roy; Iannuzzi, Mariano. (2017) Effect of tungsten on the pitting and crevice corrosion resistance of Type 25Cr super duplex stainless steels. Corrosion. volum 73 (1).
Academic article
Iannuzzi, Mariano; Barnoush, Afrooz; Johnsen, Roy. (2017) Materials and corrosion trends in offshore and subsea oil and gas production. npj Materials Degradation.
Academic article
Johnsen, Roy; Nese, Ove. (2017) AA5083 and AA6082 exposed to seawater - Effect of potential on corrosion behaviour. International Corrosion Conference Series. volum 3.
Academic article
Krogstad, Hedda Nordby; Johnsen, Roy. (2017) Corrosion properties of nickel-aluminium bronze in natural seawater?Effect of galvanic coupling to UNS S31603. Corrosion Science. volum 121.
Academic article
Krogstad, Hedda Nordby; Johnsen, Roy; Coey, M. (2017) Corrosion of nickel aluminium bronze - Effect of a uniform magnetic field. International Corrosion Conference Series. volum 3.
Academic article
Krogstad, Hedda Nordby; Skilbred, Ellen Synnøve; Johnsen, Roy. (2017) Corrosion of nickel aluminium bronze - Effect of alloying elements and pH. International Corrosion Conference Series. volum 3.
Academic article
Quale, Geir; Iannuzzi, Mariano; Johnsen, Roy. (2017) Cathodic protection by distributed sacrificial anodes - A new cost-effective solution to prevent corrosion of subsea structures. International Corrosion Conference Series. volum 2.
Academic article
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian; He, Jianying; Barnoush, Afrooz. (2017) Effect of hydrogen on dislocation nucleation in alloy 718. International Journal of Hydrogen Energy. volum 42 (24).
Academic article

2016

Kheradmand, Nousha; Johnsen, Roy; Olsen, Jim Stian; Barnoush, Afrooz. (2016) Effect of Hydrogen on the hardness of different phases in super duplex stainless steel. International Journal of Hydrogen Energy. volum 41 (1).
Academic article
Lange, Torstein; Bengtsson Blucher, Daniel; Venkataraman, Shankar; Jakobi, Dietinde; Asteman, Henrik; Johnsen, Roy. (2016) A new cast Ni-base alloy suitable for severe sour service. International Corrosion Conference Series. volum 4.
Academic article
Næss, Monika; Johnsen, Roy; Haugan, Eirik Bjørge; Iannuzzi, Mariano. (2016) Effect of tungsten on pitting and crevice corrosion of type 25Cr super duplex stainless steel. International Corrosion Conference Series. volum 2.
Academic article

2015

Castberg, Tore Støren; Johnsen, Roy; Berget, J. (2015) Corrosion and subsequent erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition. Materials and corrosion - Werkstoffe und Korrosion. volum 66 (9).
Academic article
Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2015) Corrosion of thermally sprayed aluminum in flowing seawater. International Corrosion Conference Series.
Academic article
Næss, Monika E; Iannuzzi, Mariano; Johnsen, Roy. (2015) Use of electrochemical techniques to determine the effect of sigma (σ)-phase precipitation on a 25 wt% CR super duplex stainless steel. International Corrosion Conference Series. volum 2015-January.
Academic article
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian. (2015) Susceptibility to Hydrogen Induced Stress Cracking of UNS N07718 and UNS N07725 under cathodic polarization. International Corrosion Conference Series.
Academic article

2014

Olden, Vigdis; Saai, Afaf; Jemblie, Lise; Johnsen, Roy. (2014) FE simulation of hydrogen diffusion in duplex stainless steel. International Journal of Hydrogen Energy. volum 39 (2).
Academic article

2013

Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2013) Small-scale structural and mechanical characterization of the nitrided layer in martensitic steel. Tribology International. volum 61.
Academic article
Asgari, Masoud; Johnsen, Roy; Barnoush, Afrooz. (2013) Nanomechanical characterization of the hydrogen effect on pulsed plasma nitrided super duplex stainless steel. International Journal of Hydrogen Energy. volum 38 (35).
Academic article
Asgari, Masoud; S. Azar, Amin; Barnoush, Afrooz; Johnsen, Roy. (2013) Orientation Relationships and Texture of the Iron-Nitride Phase Constituents in Pulsed Plasma Nitriding. Metallurgical and Materials Transactions A. volum 44 (10).
Academic article
Baltzersen, Øystein; Johnsen, Roy; Martinussen, H; Nerbø, Ingar Stian. (2013) Using permanently installed ultrasound monitoring to maximize the lifetime of a pipeline. International Corrosion Conference Series. volum 2013.
Academic article
Barnoush, Afrooz; Asgari, Masoud; Johnsen, Roy; Hoel, Rune. (2013) Hydrogen Effect on Nanomechanical Properties of the Nitrided Steel. Metallurgical and Materials Transactions A. volum 44 (2).
Academic article
Brataas, Arne; Mathiesen, Ragnvald; Grande, Tor; Roven, Hans Jørgen; Grepstad, Jostein; Echtermeyer, Andreas; Johnsen, Roy; Krøkje, Åse. (2013) Enabling technologies at NTNU; materials science and engineering. 2013.
Report
Castberg, Tore Støren; Johnsen, Roy; Berget, John. (2013) Erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition. Wear. volum 300 (1-2).
Academic article
Espallargas, Nuria; Johnsen, Roy; Torres, Christian Rodriguez; Igual Munoz, Anna. (2013) A new experimental technique for quantifying the galvanic coupling effects on stainless steel during tribocorrosion under equilibrium conditions. Wear. volum 307 (1-2).
Academic article

2012

Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2012) Nanomechanical evaluation of the protectiveness of nitrided layers against hydrogen embrittlement. Corrosion Science. volum 62 (Sept).
Academic article
Barnoush, Afrooz; Asgari, Masoud; Johnsen, Roy. (2012) Resolving the hydrogen effect on dislocation nucleation and mobility by electrochemical nanoindentation. Scripta Materialia. volum 66 (6).
Academic article
De Ridder, Karin; Pape, Kristine; Johnsen, Roy; Westin, Steinar; Holmen, Turid Lingaas; Bjørngaard, Johan Håkon. (2012) Adolescent health is associated with high school dropout, independent of parental socioeconomic status: a prospective population study, The Young-HUNT 1 study (Norway). European Journal of Public Health. volum 22.
Abstract
Perez Ramirez, Pedro Agustin; Johnsen, Roy; Utne, Ingrid Bouwer. (2012) Probabilistic condition assessment of aging equipment considering the effect of operating conditions and maintenance. 2012 Proceedings of the ASME 31st International Conference on Ocean, Offshore and Arctic Engineering (OMAE2012): Volume 2 Structures, Safety and Reliability.
Academic chapter/article/Conference paper
Von der Ohe, Christian Bertil; Johnsen, Roy; Espallargas, Nuria. (2012) Multi-degradation behavior of austenitic and super duplex stainless steel - The effect of 4-point static and cyclic bending applied to a simulated seawater tribocorrosion system. Wear. volum 288.
Academic article

2011

Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2011) Microstructural characterization of pulsed plasma nitrided 316L stainless steel. Materials Science & Engineering: A. volum 529.
Academic article
Hörnlund, Erik; Ersdal, Gerhard; Hinderaker, Rolf H.; Johnsen, Roy; Sharp, John M.. (2011) Material Issues in Ageing and Life Extension (OMAE2011-49363). 30th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2011) - Vol. III.
Academic chapter/article/Conference paper
Johnsen, Roy. (2011) Tribocorrosion in Marine Environments. Tribocorrosion of passive metals and coatings.
Academic chapter/article/Conference paper
Rommetveit, Tarjei; Johansen, Tonni Franke; Johnsen, Roy. (2011) Using a multi-layered transducer model to estimate the properties of paraffin wax deposited on steel. Ultrasonics. volum 51 (1).
Academic article
Von der Ohe, Christian Bertil; Johnsen, Roy; Espallargas, Nuria. (2011) A multi-degradation test rig for studying the synergy effects of tribocorrosion interacting with 4-point static and cyclic bending. Wear. volum 271 (11-12).
Academic article

2010

Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Adhesion Properties of Polysiloxane Topcoats. Corrosion. volum 66 (12).
Academic article
Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Internal Stress in Polysiloxane Topcoats. Corrosion. volum 66 (6).
Academic article
Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Mechanical Properties of Polysiloxane Topcoats. Corrosion. volum 66 (6).
Academic article
Axelsen, Sten Bjarne; Knudsen, Ole Øystein; Johnsen, Roy. (2010) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 2: Framework Establishment. Corrosion. volum 66 (1).
Academic article
Axelsen, Sten Bjarne; Sjaastad, A; Knudsen, Ole Øystein; Johnsen, Roy. (2010) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 3: A Case Study. Corrosion. volum 66 (1).
Academic article
Laustad, Gro; Johnsen, Roy; Asbjørnsen, Ingvild; Bjurstrøm, Martin; Hjorth, C.G. (2010) Resistance Toward Hydrogen-Induced Stress Cracking of Hot Isostatically Pressed Duplex Stainles Steel under Cathodic Protection. Corrosion. volum 66 (11).
Academic article
Rommetveit, Tarjei; Johansen, Tonni Franke; Johnsen, Roy. (2010) A Combined Approach for High-Resolution Corrosion Monitoring and Temperature Compensation Using Ultrasound. IEEE Transactions on Instrumentation and Measurement. volum 59 (11).
Academic article
von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2010) Modeling the multi-degradation mechanisms of combined tribocorrosion interacting with static and cyclic loaded surfaces of passive metals exposed to seawater. Wear. volum 269 (7-8).
Academic article

2009

Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd. (2009) Influence of hydrogen from cathodic protection on the fracture susceptibility of 25%Cr duplex stainless steel - Constant load SENT testing and FE-modelling using hydrogen influenced cohesive zone elements. Engineering Fracture Mechanics. volum 76 (7).
Academic article
Axelsen, Sten Bjarne; Knudsen, Ole Øystein; Johnsen, Roy. (2009) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System - Part 1: Risk Analysis Methodology. Corrosion. volum 65 (12).
Academic article
Johnsen, Roy; Nyhus, Bård; Wästberg, Stig. (2009) Hydrogen Embrittlement of Stainless Steels Under Cathodic Protection in Seawater - Presentation of a New Test Method. Proceedings of the ASME 28th International Conference on Ocean, Offshore and Arctic Engineering - OMAE2009.
Academic chapter/article/Conference paper
von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2009) Hydraulic Cylinders for Offshore Splash Zone Operation: A Review of Piston Rod Failure Cases and Alternative Concepts. Proceedings of the ASME 28th International Conference on Ocean, Offshore and Arctic Engineering - OMAE2009.
Academic chapter/article/Conference paper

2008

Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd. (2008) Application of hydrogen influenced cohesive laws in the prediction of hydrogen induced stress cracking in 25%Cr duplex stainless steel. Engineering Fracture Mechanics. volum 75 (8).
Academic article
Olden, Vigdis; Thaulow, Christian; Johnsen, Roy. (2008) Modelling of hydrogen diffusion and hydrogen induced cracking in supermartensitic and duplex stainless steels. Materials & design. volum 29 (10).
Academic literature review

2007

Johnsen, Roy. (2007) Experience with the use of copper alloys in seawater systems on the Norwegian Continental Shelf. Corrosion behaviour and protection of copper and aluminium alloys in seawater.
Academic chapter/article/Conference paper
Okstad, Trine; Rannestad, Øyvind; Johnsen, Roy; Nisancioglu, Kemal. (2007) Significance of hydrogen evolution during cathodic protection of carbon steel in Seawater. Corrosion. volum 63 (9).
Academic article
Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling. (2007) Cohesive Zone Modeling of hydrogen-induced stress cracking in 25% Cr duplex stainless steel. Scripta Materialia. volum 57 (7).
Academic article

2006

Johnsen, Roy; Gjerding-Smith, Knut; Lange, Hans Iver; Leinum, Bente; Gundersen, Gunnar; Isaksen, Bjørn; Nærum, Gunnar. (2006) Wire fracture in locked coil cables. Bridge Structures - Assessment, Design and Construction. volum 2 (6).
Academic article

Journal publications

Karimi, Shabnam; Taji, Iman; Hajilou, Tarlan; Palencsar, Simona; Dugstad, Arne; Barnoush, Afrooz; Verbeken, Kim; Depover, Tom; Johnsen, Roy. (2023) Role of cementite morphology on corrosion layer formation of high-strength carbon steels in sweet and sour environments. Corrosion Science. volum 214.
Academic article
Karimi, Shabnam; Taji, Iman; Palencsar, Simona; Dugstad, Arne; Hajilou, Tarlan; Barnoush, Afrooz; Verbeken, Kim; Johnsen, Roy; Depover, Tom. (2023) Evaluation of microstructural and environmental effects on the hydrogen uptake and desorption in high-strength carbon steels: A thermal desorption spectroscopy study. Corrosion Science. volum 219.
Academic article
Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2023) Experimental comparison of gaseous and electrochemical hydrogen charging in X65 pipeline steel using the permeation technique. Corrosion Science. volum 215.
Academic article
Hornus, Edgar; Vouilloz, Francisco; Long, Yu; Andersen, Kjetil; Krosness, Ola; King, Mike; Johnsen, Roy; Salasa, Mobin; Iannuzzi, Mariano. (2022) Growth Kinetics of Calcareous Deposits on Thermally Sprayed Aluminum Coatings in Natural Seawater. Corrosion. volum 78 (12).
Academic article
Karimi, Shabnam; Taji, Iman; Hajilou, Tarlan; Barnoush, Afrooz; Johnsen, Roy. (2022) Evaluation of the cementite morphology influence on the hydrogen induced crack nucleation and propagation path in carbon steels. International Journal of Hydrogen Energy. volum 47 (30).
Academic article
Lu, Xu; Depover, Tom; Johnsen, Roy. (2022) Evaluation of hydrogen diffusion and trapping in nickel Alloy 625 by thermal desorption spectroscopy. International Journal of Hydrogen Energy. volum 47 (74).
Academic article
Lu, Xu; Díaz, Andrés; Ma, Jun; Wang, Dong; He, Jianying; Zhang, Zhiliang; Johnsen, Roy. (2022) The effect of plastic deformation on hydrogen diffusion in nickel Alloy 625. Scripta Materialia. volum 226.
Academic article
Lu, Xu; Ma, Yan; Peng, Ding; Johnsen, Roy; Wang, Dong. (2022) In situ nanomechanical characterization of hydrogen effects on nickel-based alloy 725 under different metallurgical conditions. Journal of Materials Science & Technology. volum 135.
Academic article
Lu, Xu; Wang, Dong; Johnsen, Roy. (2022) Hydrogen diffusion and trapping in nickel-based alloy 625: An electrochemical permeation study. Electrochimica Acta. volum 421.
Academic article
Lu, Xu; Wang, Dong; Wan, Di; Guo, Xiaofei; Johnsen, Roy. (2022) Reveal hydrogen behavior at grain boundaries in Fe-22Mn-0.6C TWIP steel via in-situ micropillar compression test. Acta Metallurgica Sinica (English Letters).
Academic article
Maicas Esteve, Héctor; Taji, Iman; Wilms, Marc; Gonzalez-Garcia, Yaiza; Johnsen, Roy. (2022) Corrosion and Microstructural Investigation on Additively Manufactured 316L Stainless Steel: Experimental and Statistical Approach. Materials. volum 15 (4).
Academic article
Skilbred, Ellen Synnøve; Palencsar, Simona; Dugstad, Arne; Johnsen, Roy. (2022) Hydrogen uptake during active CO2-H2S corrosion of carbon steel wires in simulated annulus fluid. Corrosion Science. volum 199.
Academic article
Taji, Iman; Hajilou, Tarlan; Ebner, Anna Sophie; Scheiber, Daniel; Karimi, Shabnam; Plesiutschnig, Ernst; Ecker, Werner; Barnoush, Afrooz; Maier-Kiener, Verena; Johnsen, Roy; Razumovskiy, Vsevolod I.. (2022) Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying. Corrosion Science. volum 203.
Academic article
Taji, Iman; Hajilou, Tarlan; Karimi, Shabnam; Schott, Florian; Plesiutschnig, Ernst; Barnoush, Afrooz; Johnsen, Roy. (2022) Role of grain boundaries in hydrogen embrittlement of alloy 725: single and bi-crystal microcantilever bending study. International Journal of Hydrogen Energy. volum 47 (25).
Academic article
Wang, Dong; Hagen, Anette Brocks; Undrum Fathi, Pernille; Lin, Meichao; Johnsen, Roy; Lu, Xu. (2022) Investigation of hydrogen embrittlement behavior in X65 pipeline steel under different hydrogen charging conditions. Materials Science & Engineering: A. volum 860.
Academic article
Skilbred, Ellen Synnøve; Kappes, Mariano; Iannuzzi, Mariano; Johnsen, Roy. (2021) Hydrogen uptake and diffusivity in steel armor wires with different chemical composition, carbide distribution, grain size, and degree of deformation. Materials and corrosion - Werkstoffe und Korrosion. volum 73 (3).
Academic article
Torres Rodriguez, Cristian; Johnsen, Roy; Iannuzzi, Mariano. (2021) Crevice corrosion of solution annealed 25Cr duplex stainless steels: Effect of W on critical temperatures. Corrosion Science. volum 178.
Academic article
Wang, Dong; Hagen, Anette Brocks; Wan, Di; Lu, Xu; Johnsen, Roy. (2021) Probing hydrogen effect on nanomechanical properties of X65 pipeline steel using in-situ electrochemical nanoindentation. Materials Science & Engineering: A. volum 824.
Academic article
Wang, Dong; Lu, Xu; Lin, Meichao; Wan, Di; Li, Zhiming; He, Jianying; Johnsen, Roy. (2021) Understanding the hydrogen effect on pop-in behavior of an equiatomic high-entropy alloy during in-situ nanoindentation. Journal of Materials Science & Technology. volum 98.
Academic article
Wang, Dong; Lu, Xu; Wan, Di; Guo, Xiaofei; Johnsen, Roy. (2021) Effect of hydrogen on the embrittlement susceptibility of Fe-22Mn-0.6C TWIP steel revealed by in-situ tensile tests. Materials Science & Engineering: A. volum 802.
Academic article
Lervik, Adrian; Walmsley, John; Lodgaard, Lars; Marioara, Calin Daniel; Johnsen, Roy; Lunder, Otto; Holmestad, Randi. (2020) Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy. Metals. volum 10 (9).
Academic article
Skilbred, Ellen Synnøve; Lootz, Signe Aarthun; Johnsen, Roy. (2020) Hydrogen Embrittlement Susceptibility of Steel Armor Wires for Flexible Pipes. International Corrosion Conference Series.
Academic article
Stenerud, Gaute; Hajilou, Tarlan; Olsen, Jim Stian; Taji, Iman; Barnoush, Afrooz; Johnsen, Roy. (2020) The Effect of Hydrogen on the Nanoindentation Behavior of Heat Treated 718 Alloy. Metals. volum 10 (11).
Academic article
Torres Rodriguez, Cristian; Hazarabedian, Maria Sofia; Quadir, Zakaria; Johnsen, Roy; Iannuzzi, Mariano. (2020) The Role of Tungsten on the Phase Transformation Kinetics and its Correlation with the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels. Journal of the Electrochemical Society. volum 167 (8).
Academic article
Torres Rodriguez, Cristian; Iannuzzi, Mariano; Johnsen, Roy. (2020) Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels. Metals. volum 10 (10).
Academic article
Ingdal, Mats; Johnsen, Roy; Harrington, David A.. (2019) The Akaike information criterion in weighted regression of immittance data. Electrochimica Acta. volum 317.
Academic article
Johnsen, Roy; Gjelseng, Linn Cecilie; Heimsæter, Martin Arne; Jernberg, Anders; Qvale, Atle H. (2019) Influence of Manufacturing Process and Resulting Microstructure on HISC Susceptibility of 25Cr Duplex Stainless Steel Pipe. International Corrosion Conference Series.
Academic article
Johnsen, Roy; Olavesen, Henrik Horten; Hossein Zavieh, Amin; Erlien, Tomas Laugsand. (2019) Effect of cathodic polarization on localized corrosion of 25Cr in seawater. International Corrosion Conference Series. volum 2019-March.
Academic article
Kheradmand, Nousha; Rogne, Bjørn Rune Sørås; Dumoulin, Stephane; Deng, Yun; Johnsen, Roy; Barnoush, Afrooz. (2019) Small scale testing approach to reveal specific features of slip behavior in BCC metals. Acta Materialia. volum 174.
Academic article
Stefansson, Njall; Dunn, John; Strand, Einar; Johnsen, Roy; Heimsæter, Martin Arne. (2019) Performance of high strength UNS N08830 in hydrogen stress crack testing to simulate conditions arising from subsea cathodic protection. International Corrosion Conference Series. volum 2019-March.
Academic article
Torres Rodriguez, Cristian; Johnsen, Roy; Østvold, Hege Kokslien; Bernås, Mia; Iannuzzi, Mariano. (2019) Effect ofW on Phase Transformation Kinetics and its Correlation with Localized Corrosion Resistance for UNS S39274. International Corrosion Conference Series. volum 2019-March.
Academic article
Wilson, Håvard; Johnsen, Roy; Torres Rodriguez, Cristian; Hesjevik, Sven Morten. (2019) Properties of TSA in natural seawater at ambient and elevated temperature. Materials and corrosion - Werkstoffe und Korrosion. volum 70 (2).
Academic article
Bernås, Mia; Westermann, Ida; Johnsen, Roy; Torres Rodriguez, Cristian; Jernberg, Anders; Qvale, Atle H; Iannuzzi, Manuela. (2018) Effect of tungsten on the precipitation kinetics and localized corrosion resistance of super duplex stainless steels. International Corrosion Conference Series. volum 2018-April.
Academic article
Hajilou, Tarlan; Hope, Malin Sofie B.; Hossein Zavieh, Amin; Kheradmand, Nousha; Johnsen, Roy; Barnoush, Afrooz. (2018) In situ small-scale hydrogen embrittlement testing made easy: An electrolyte for preserving surface integrity at nano-scale during hydrogen charging. International Journal of Hydrogen Energy. volum 43 (27).
Academic article
Husby, Hans; Iannuzzi, Mariano; Johnsen, Roy; Mariano, Kappes; Barnoush, Afrooz. (2018) Effect of nickel on hydrogen permeation in ferritic/ pearlitic low alloy steels. International Journal of Hydrogen Energy. volum 43 (7).
Academic article
Husby, Hans; Wagstaff, Philip Haakon; Iannuzzi, Mariano; Johnsen, Roy; Kappes, Mariano A. (2018) Effect of Nickel on the Hydrogen Stress Cracking Resistance of Ferritic/Pearlitic Low Alloy Steels. Corrosion. volum 74 (7).
Academic article
Johnsen, Roy; Lange, Torstein; Stenerud, Gaute; Olsen, Jim Stian. (2018) Environmentally assisted degradation of spinodal copper alloy C72900. Corrosion Science. volum 142.
Academic article
Krogstad, Hedda Nordby; Johnsen, Roy; Coey, Michael. (2018) Effect of a time-dependent magnetic field on the corrosion of Ni-Al bronze. Corrosion. volum 74 (3).
Academic article
Krogstad, Hedda Nordby; Johnsen, Roy; Coey, Michael. (2018) Effect of a uniform magnetic field on corrosion of Ni-Al bronze in 3.5wt% NaCl. Corrosion. volum 74 (2).
Academic article
Ryen, Audun; Johnsen, Roy; Iannuzzi, Mariano; Årtun, Lars. (2018) Cathodic protection by distributed sacrificial anodes - Performance at elevated temperature and in mud. International Corrosion Conference Series. volum 2018-April.
Academic article
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian. (2018) Hydrogen stress cracking and crack initiation in precipitation hardened Ni-alloys. Engineering Failure Analysis. volum 89.
Academic article
Stenerud, Gaute; Wenner, Sigurd; Olsen, Jim Stian; Johnsen, Roy. (2018) Effect of different microstructural features on the hydrogen embrittlement susceptibility of alloy 718. International Journal of Hydrogen Energy. volum 43 (13).
Academic article
Torres Rodriguez, Cristian; Kappes, Mariano A; Johnsen, Roy; Iannuzzi, Mariano. (2018) Influence of tungsten on passivity breakdown and repassivation of 25CR super duplex stainless steel. International Corrosion Conference Series. volum 2018-April.
Academic article
Wold, Kristian; Johnsen, Roy; Iannuzzi, Mariano; Årtun, Lars. (2018) Integrated cathodic protection (CP) sensor network development of the CP sensor. International Corrosion Conference Series. volum 2018-April.
Academic article
Bernås, Mia; Westermann, Ida; Johnsen, Roy; Lauritsen, Christian; Iannuzzi, Mariano. (2017) Effect of microstructure on the corrosion resistance of duplex stainless steels: Materials performance maps. International Corrosion Conference Series. volum 8.
Academic article
Farhat, Hanan; Johnsen, Roy. (2017) Hydrogen sulfide tube failure in a seawater heat exchanger. Materials performance. volum 56 (9).
Academic article
Haugan, Eirik; Næss, Monika; Torres Rodriguez, Cristian; Johnsen, Roy; Iannuzzi, Mariano. (2017) Effect of tungsten on the pitting and crevice corrosion resistance of Type 25Cr super duplex stainless steels. Corrosion. volum 73 (1).
Academic article
Iannuzzi, Mariano; Barnoush, Afrooz; Johnsen, Roy. (2017) Materials and corrosion trends in offshore and subsea oil and gas production. npj Materials Degradation.
Academic article
Johnsen, Roy; Nese, Ove. (2017) AA5083 and AA6082 exposed to seawater - Effect of potential on corrosion behaviour. International Corrosion Conference Series. volum 3.
Academic article
Krogstad, Hedda Nordby; Johnsen, Roy. (2017) Corrosion properties of nickel-aluminium bronze in natural seawater?Effect of galvanic coupling to UNS S31603. Corrosion Science. volum 121.
Academic article
Krogstad, Hedda Nordby; Johnsen, Roy; Coey, M. (2017) Corrosion of nickel aluminium bronze - Effect of a uniform magnetic field. International Corrosion Conference Series. volum 3.
Academic article
Krogstad, Hedda Nordby; Skilbred, Ellen Synnøve; Johnsen, Roy. (2017) Corrosion of nickel aluminium bronze - Effect of alloying elements and pH. International Corrosion Conference Series. volum 3.
Academic article
Quale, Geir; Iannuzzi, Mariano; Johnsen, Roy. (2017) Cathodic protection by distributed sacrificial anodes - A new cost-effective solution to prevent corrosion of subsea structures. International Corrosion Conference Series. volum 2.
Academic article
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian; He, Jianying; Barnoush, Afrooz. (2017) Effect of hydrogen on dislocation nucleation in alloy 718. International Journal of Hydrogen Energy. volum 42 (24).
Academic article
Kheradmand, Nousha; Johnsen, Roy; Olsen, Jim Stian; Barnoush, Afrooz. (2016) Effect of Hydrogen on the hardness of different phases in super duplex stainless steel. International Journal of Hydrogen Energy. volum 41 (1).
Academic article
Lange, Torstein; Bengtsson Blucher, Daniel; Venkataraman, Shankar; Jakobi, Dietinde; Asteman, Henrik; Johnsen, Roy. (2016) A new cast Ni-base alloy suitable for severe sour service. International Corrosion Conference Series. volum 4.
Academic article
Næss, Monika; Johnsen, Roy; Haugan, Eirik Bjørge; Iannuzzi, Mariano. (2016) Effect of tungsten on pitting and crevice corrosion of type 25Cr super duplex stainless steel. International Corrosion Conference Series. volum 2.
Academic article
Castberg, Tore Støren; Johnsen, Roy; Berget, J. (2015) Corrosion and subsequent erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition. Materials and corrosion - Werkstoffe und Korrosion. volum 66 (9).
Academic article
Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2015) Corrosion of thermally sprayed aluminum in flowing seawater. International Corrosion Conference Series.
Academic article
Næss, Monika E; Iannuzzi, Mariano; Johnsen, Roy. (2015) Use of electrochemical techniques to determine the effect of sigma (σ)-phase precipitation on a 25 wt% CR super duplex stainless steel. International Corrosion Conference Series. volum 2015-January.
Academic article
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian. (2015) Susceptibility to Hydrogen Induced Stress Cracking of UNS N07718 and UNS N07725 under cathodic polarization. International Corrosion Conference Series.
Academic article
Olden, Vigdis; Saai, Afaf; Jemblie, Lise; Johnsen, Roy. (2014) FE simulation of hydrogen diffusion in duplex stainless steel. International Journal of Hydrogen Energy. volum 39 (2).
Academic article
Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2013) Small-scale structural and mechanical characterization of the nitrided layer in martensitic steel. Tribology International. volum 61.
Academic article
Asgari, Masoud; Johnsen, Roy; Barnoush, Afrooz. (2013) Nanomechanical characterization of the hydrogen effect on pulsed plasma nitrided super duplex stainless steel. International Journal of Hydrogen Energy. volum 38 (35).
Academic article
Asgari, Masoud; S. Azar, Amin; Barnoush, Afrooz; Johnsen, Roy. (2013) Orientation Relationships and Texture of the Iron-Nitride Phase Constituents in Pulsed Plasma Nitriding. Metallurgical and Materials Transactions A. volum 44 (10).
Academic article
Baltzersen, Øystein; Johnsen, Roy; Martinussen, H; Nerbø, Ingar Stian. (2013) Using permanently installed ultrasound monitoring to maximize the lifetime of a pipeline. International Corrosion Conference Series. volum 2013.
Academic article
Barnoush, Afrooz; Asgari, Masoud; Johnsen, Roy; Hoel, Rune. (2013) Hydrogen Effect on Nanomechanical Properties of the Nitrided Steel. Metallurgical and Materials Transactions A. volum 44 (2).
Academic article
Castberg, Tore Støren; Johnsen, Roy; Berget, John. (2013) Erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition. Wear. volum 300 (1-2).
Academic article
Espallargas, Nuria; Johnsen, Roy; Torres, Christian Rodriguez; Igual Munoz, Anna. (2013) A new experimental technique for quantifying the galvanic coupling effects on stainless steel during tribocorrosion under equilibrium conditions. Wear. volum 307 (1-2).
Academic article
Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2012) Nanomechanical evaluation of the protectiveness of nitrided layers against hydrogen embrittlement. Corrosion Science. volum 62 (Sept).
Academic article
Barnoush, Afrooz; Asgari, Masoud; Johnsen, Roy. (2012) Resolving the hydrogen effect on dislocation nucleation and mobility by electrochemical nanoindentation. Scripta Materialia. volum 66 (6).
Academic article
De Ridder, Karin; Pape, Kristine; Johnsen, Roy; Westin, Steinar; Holmen, Turid Lingaas; Bjørngaard, Johan Håkon. (2012) Adolescent health is associated with high school dropout, independent of parental socioeconomic status: a prospective population study, The Young-HUNT 1 study (Norway). European Journal of Public Health. volum 22.
Abstract
Von der Ohe, Christian Bertil; Johnsen, Roy; Espallargas, Nuria. (2012) Multi-degradation behavior of austenitic and super duplex stainless steel - The effect of 4-point static and cyclic bending applied to a simulated seawater tribocorrosion system. Wear. volum 288.
Academic article
Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2011) Microstructural characterization of pulsed plasma nitrided 316L stainless steel. Materials Science & Engineering: A. volum 529.
Academic article
Rommetveit, Tarjei; Johansen, Tonni Franke; Johnsen, Roy. (2011) Using a multi-layered transducer model to estimate the properties of paraffin wax deposited on steel. Ultrasonics. volum 51 (1).
Academic article
Von der Ohe, Christian Bertil; Johnsen, Roy; Espallargas, Nuria. (2011) A multi-degradation test rig for studying the synergy effects of tribocorrosion interacting with 4-point static and cyclic bending. Wear. volum 271 (11-12).
Academic article
Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Adhesion Properties of Polysiloxane Topcoats. Corrosion. volum 66 (12).
Academic article
Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Internal Stress in Polysiloxane Topcoats. Corrosion. volum 66 (6).
Academic article
Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Mechanical Properties of Polysiloxane Topcoats. Corrosion. volum 66 (6).
Academic article
Axelsen, Sten Bjarne; Knudsen, Ole Øystein; Johnsen, Roy. (2010) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 2: Framework Establishment. Corrosion. volum 66 (1).
Academic article
Axelsen, Sten Bjarne; Sjaastad, A; Knudsen, Ole Øystein; Johnsen, Roy. (2010) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 3: A Case Study. Corrosion. volum 66 (1).
Academic article
Laustad, Gro; Johnsen, Roy; Asbjørnsen, Ingvild; Bjurstrøm, Martin; Hjorth, C.G. (2010) Resistance Toward Hydrogen-Induced Stress Cracking of Hot Isostatically Pressed Duplex Stainles Steel under Cathodic Protection. Corrosion. volum 66 (11).
Academic article
Rommetveit, Tarjei; Johansen, Tonni Franke; Johnsen, Roy. (2010) A Combined Approach for High-Resolution Corrosion Monitoring and Temperature Compensation Using Ultrasound. IEEE Transactions on Instrumentation and Measurement. volum 59 (11).
Academic article
von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2010) Modeling the multi-degradation mechanisms of combined tribocorrosion interacting with static and cyclic loaded surfaces of passive metals exposed to seawater. Wear. volum 269 (7-8).
Academic article
Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd. (2009) Influence of hydrogen from cathodic protection on the fracture susceptibility of 25%Cr duplex stainless steel - Constant load SENT testing and FE-modelling using hydrogen influenced cohesive zone elements. Engineering Fracture Mechanics. volum 76 (7).
Academic article
Axelsen, Sten Bjarne; Knudsen, Ole Øystein; Johnsen, Roy. (2009) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System - Part 1: Risk Analysis Methodology. Corrosion. volum 65 (12).
Academic article
Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd. (2008) Application of hydrogen influenced cohesive laws in the prediction of hydrogen induced stress cracking in 25%Cr duplex stainless steel. Engineering Fracture Mechanics. volum 75 (8).
Academic article
Olden, Vigdis; Thaulow, Christian; Johnsen, Roy. (2008) Modelling of hydrogen diffusion and hydrogen induced cracking in supermartensitic and duplex stainless steels. Materials & design. volum 29 (10).
Academic literature review
Okstad, Trine; Rannestad, Øyvind; Johnsen, Roy; Nisancioglu, Kemal. (2007) Significance of hydrogen evolution during cathodic protection of carbon steel in Seawater. Corrosion. volum 63 (9).
Academic article
Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling. (2007) Cohesive Zone Modeling of hydrogen-induced stress cracking in 25% Cr duplex stainless steel. Scripta Materialia. volum 57 (7).
Academic article
Johnsen, Roy; Gjerding-Smith, Knut; Lange, Hans Iver; Leinum, Bente; Gundersen, Gunnar; Isaksen, Bjørn; Nærum, Gunnar. (2006) Wire fracture in locked coil cables. Bridge Structures - Assessment, Design and Construction. volum 2 (6).
Academic article

Part of book/report

Parow, Hanna; Johnsen, Roy; Skovhus, Torben Lund. (2021) MIC in the Fire Water Sprinkler System at St. Olavs Hospital, Trondheim, Norway. Failure Analysis of Microbiologically Influenced Corrosion.
Academic chapter/article/Conference paper
Perez Ramirez, Pedro Agustin; Johnsen, Roy; Utne, Ingrid Bouwer. (2012) Probabilistic condition assessment of aging equipment considering the effect of operating conditions and maintenance. 2012 Proceedings of the ASME 31st International Conference on Ocean, Offshore and Arctic Engineering (OMAE2012): Volume 2 Structures, Safety and Reliability.
Academic chapter/article/Conference paper
Hörnlund, Erik; Ersdal, Gerhard; Hinderaker, Rolf H.; Johnsen, Roy; Sharp, John M.. (2011) Material Issues in Ageing and Life Extension (OMAE2011-49363). 30th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2011) - Vol. III.
Academic chapter/article/Conference paper
Johnsen, Roy. (2011) Tribocorrosion in Marine Environments. Tribocorrosion of passive metals and coatings.
Academic chapter/article/Conference paper
Johnsen, Roy; Nyhus, Bård; Wästberg, Stig. (2009) Hydrogen Embrittlement of Stainless Steels Under Cathodic Protection in Seawater - Presentation of a New Test Method. Proceedings of the ASME 28th International Conference on Ocean, Offshore and Arctic Engineering - OMAE2009.
Academic chapter/article/Conference paper
von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2009) Hydraulic Cylinders for Offshore Splash Zone Operation: A Review of Piston Rod Failure Cases and Alternative Concepts. Proceedings of the ASME 28th International Conference on Ocean, Offshore and Arctic Engineering - OMAE2009.
Academic chapter/article/Conference paper
Johnsen, Roy. (2007) Experience with the use of copper alloys in seawater systems on the Norwegian Continental Shelf. Corrosion behaviour and protection of copper and aluminium alloys in seawater.
Academic chapter/article/Conference paper

Report

Lu, Xu; Kattuputhur Soundararajan, Chandrahaasan; Wang, Dong; Johnsen, Roy. (2023) Failure investigation of Alloy 725 drive screw. 2023.
Report
Brataas, Arne; Mathiesen, Ragnvald; Grande, Tor; Roven, Hans Jørgen; Grepstad, Jostein; Echtermeyer, Andreas; Johnsen, Roy; Krøkje, Åse. (2013) Enabling technologies at NTNU; materials science and engineering. 2013.
Report

Teaching

Courses

Media

2022

Academic lecture

Johnsen, Roy. (2022) Hydrogen uptake and embrittlement of X65 pipeline steel. Material Science day at Qatar Environment and Energy Research Institute (QEERI) . Qatar Environment and Energy Research Institute (QEERI); Doha, Qatar. 2022-09-15 - 2022-09-15.
Academic lecture

Johnsen, Roy; Djupvik, Veronika; Hartung, Cathrine; Qvale, Atle Helge; Westermann, Ida. (2022) The Susceptibility of Spheroidal Graphite Cast Iron to Hydrogen Induced Stress Cracking. AMPP Corrosion . Association for Materials Protection and Performance (AMPP); San Antonio, Texas. 2022-03-06 - 2022-03-10.
Lecture

Johnsen, Roy; Duparc, Marion; Skar, Jan-Ivar; Saxegård, Tov Eivind. (2022) Determination of Oxygen Limits for Corrosion Resistant Alloys (CRAs) in Oil & Gas Produced Water Based on Electrochemical Test Methods – Part 2. AMPP Corrosion . Association for Materials Protection and Performance (AMPP); San Antonio, Texas. 2022-03-05 - 2022-03-10.
Lecture

Johnsen, Roy; Salasi, Mobin; Iannizzi, Mariano; Andersen, Kjetil; Krosness, Ola. (2022) Calcareous deposition on thermally sprayed aluminum surfaces. AMPP Corrosion . Association for Materials Protection and Performance (AMPP); San Antonio, Texas. 2022-03-05 - 2022-03-10.
Lecture

Johnsen, Roy; Torres, Cristian; Skar, Jan-Ivar; Duparc, Marion; Hesjevik, Sven Morten. (2022) Determination of oxygen limits for corrosion resistant alloys (CRAs) in oil & gas produced water based on electrochemical test methods Part 1: Crevice corrosion and repassivation potentials without oxygen. AMPP Corrosion . Association for Materials Protection and Performance (AMPP); San Antonio, Texas. 2022-03-06 - 2022-03-10.
Academic lecture

Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2022) Correlating electrochemical and gaseous hydrogen charging of a X65 pipeline steel by the permeation technique. ECF23, European Conference on Fracture 2022 . European Structural Integrity Society; Madeira, Portugal. 2022-06-27 - 2022-07-01.
Academic lecture

Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2022) Experimental comparison of gaseous and electrochemical hydrogen charging in a X65 pipeline steel using the permeation technique. EUROCORR2022 . European Federation of Corrosion; Berlin, Tyskland. 2022-08-28 - 2022-09-01.
Academic lecture

Lu, Xu; Johnsen, Roy. (2022) H-assisted failure in nickel alloys and possible mitigation approach. 4th Sweden hydrogen seminar . Swerim; 2022-10-27 - 2022-10-27.
Academic lecture

Lu, Xu; Johnsen, Roy. (2022) Hydrogen diffusion and trapping in nickel Alloys 625 and 725. HEiNS symposium . NTNU; Trondheim. 2022-12-05 - 2022-12-06.
Academic lecture

Lu, Xu; Johnsen, Roy. (2022) Hydrogen diffusion and uptake in nickel Alloy 625. Eurocorr Conference ; Berlin. 2022-08-28 - 2022-09-01.
Academic lecture

Lu, Xu; Johnsen, Roy. (2022) Hydrogen diffusion and uptake in nickel alloy 625. Nasjonal konferanse for materialteknologi ; Oslo. 2022-06-01 - 2022-06-02.
Academic lecture

Nyhus, Bård; Alvaro, Antonio; Myhre, Aleksander Omholt; Hagen, Anette Brocks; Wang, Dong; Koren, Erik Aas; Lin, Meichao; Matsunaga, Hisao; Johnsen, Roy; Vinogradov, Alexei; Olden, Vigdis. (2022) Hydrogen-materials research on the influence of pressurized H2 gas on pipeline steel - Recent results from the HyLINE project. Subsea Pipelines & Cables . Norsk Petroleumsforening; Trondheim. 2022-10-11 - 2022-10-12.
Academic lecture

Olden, Vigdis; Vinogradov, Alexei; Johnsen, Roy; Zhang, Zhiliang; Alvaro, Antonio; Hagen, Catalina Hoem Musinoi; Hagen, Anette Brocks; Koren, Erik Aas; Wang, Dong; Myhre, Aleksander Omholt. (2022) Hydrogen embrittlement resistance of X65 pipeline steels - Results from the HyLINE project. HYDROGEN-MATERIALS INTERACTIONS - HYDROGENIUS, I2CNER, HYDROMATE AND SINTEF JOINT RESEARCH SYMPOSIUM 2022 . HYDROGENIUS, I2CNER, HYDROMATE AND SINTEF; Fukuoka, Kyushu Universitet. 2022-01-27 - 2022-01-28.
Lecture

Olden, Vigdis; Vinogradov, Alexei; Johnsen, Roy; Zhang, Zhiliang; Alvaro, Antonio; Hagen, Catalina Hoem Musinoi; Hagen, Anette Brocks; Koren, Erik Aas; Wang, Dong; Myhre, Aleksander Omholt; Lin, Meichao. (2022) Hydrogen embrittlement resistance of X65 pipeline steel – recent results from the HyLINE project. Robust materialvalg i energisektoren . Norsk Forening for vedlikehold; Quality Hotel Olavsgaard, Skjetten. 2022-04-04 - 2022-04-05.

2021

Academic lecture

Hagen, Catalina Hoem Musinoi; Knudsen, Ole Øystein; Johnsen, Roy; Pfleging, Wilhelm. (2021) Oxidation of coated steel during exposure to humid air and effects on cathodic disbonding. EUROCORR 2021 ; 2021-09-20 - 2021-09-24.
Lecture

Johnsen, Roy; Eriksen, Kristian; Hauger, Stian. (2021) Welding of CRA with insufficient purging gas Impact on mechanical properties and corrosion resistance. NACE Corrosion 2021 . NACE International/AMMP; Salt Lake City, USA. 2021-04-19 - 2022-01-30.
Academic lecture

Lu, Xu; Johnsen, Roy. (2021) Effect of temperature on hydrogen uptake in nickel alloy 625. Academic Seminar on the M-HEAT project ; 2021-10-12 - 2021-10-12.
Academic lecture

Lu, Xu; Johnsen, Roy. (2021) Evaluation of hydrogen diffusion behavior in nickel alloy 625. Academic Seminar on the M-HEAT project . NTNU; NTNU. 2021-03-23 - 2021-03-23.
Academic lecture

Lu, Xu; Johnsen, Roy. (2021) Study on hydrogen trapping and diffusion in nickel alloys. Academic Seminar on the M-HEAT project . NTNU; NTNU. 2021-06-15 - 2021-06-15.

2017

Academic lecture

Johnsen, Roy. (2017) Hydrogen Induced Stress Cracking of Stainless Steel in Seawater – what do we know and what is still unknown?. EUROCORR 2017 . European Federation of Corrosion; Praha. 2017-07-03 - 2017-07-07.

2016

Academic lecture

Bengtsson Blucher, Daniel; Lange, Torstein; Venkataraman, Shankar; Asteman, Henrik; Jakobi, Dietlinde; Johnsen, Roy. (2016) A new centrifugally cast austenitic Ni-base alloy suitable for severe sour service heavy wall thickness piping application. EUROCORR 2016 ; 2016-09-11 - 2016-09-15.
Academic lecture

Bernås, Mia; Westermann, Ida; Johnsen, Roy; Iannuzzi, Mariano. (2016) Microstructural evolution during isothermal heat treatment of a W-rich super duplex stainless steel. Nasjonal Konferanse for Materialteknologi . Norsk Materialteknisk Selskap/Norsk Metallografisk Forening; Trondheim. 2016-08-24 - 2016-08-25.
Academic lecture

Johnsen, Roy. (2016) Hydrogen Induced Stress Cracking of Duplex Stainless Steel under Cathodic Protection in Seawater – Historical overview and Lessons Learned. Material Science & TEchnology 2016 . ACerS, AIST, ASM International, TMS, NACE International; Salt Lake City. 2016-10-23 - 2016-10-27.
Academic lecture

Johnsen, Roy; husby, hans; Barnoush, Afrooz; Iannuzzi, Mariano. (2016) Effect of nickel in solid solution on hydrogen transport kinetics in low alloy steels. EUROCORR/16 . European Federation of Corrosion; Montpellier. 2016-09-11 - 2016-09-15.
Lecture

Johnsen, Roy; Iannuzzi, Mariano. (2016) Distributed Sacrificial Anode (DSA) – a new cost effective solution for corrosion protection of structures in seawater. Materialdagen . Norsk Korrosjonsteknisk Forening, Stavanger avdeling; Stavanger. 2016-06-02 - 2016-06-03.
Academic lecture

Johnsen, Roy; Iannuzzi, Mariano; Haugan, Eirik; Næss, Monika E. (2016) Effect of Tungsten on Pitting and Crevice Corrosion of type 25Cr Super Duplex Stainless Steel. NACE International Corrosion 2016 Conference & Expo . NACE International; Vancouver. 2016-03-06 - 2016-03-10.
Academic lecture

Johnsen, Roy; Lange, Torstein; Olsen, Jim Stian. (2016) Susceptibility to hydrogen embrittlement for C72900 exposed to H2S environment and under cathodic polarization in simulated seawater. EUROCORR 2016 . European Federation of Corrosion; Montpellier. 2016-09-11 - 2016-09-15.
Academic lecture

Johnsen, Roy; Stenerud, Gaute; Barnoush, Afrooz; Olsen, Jim Stian. (2016) In Situ Electrochemical Nanoindentation of Alloy 718. EUROCORR 2016 . European Federation of Corrosion; Montpellier. 2016-09-11 - 2016-09-15.
Academic lecture

Krogstad, Hedda Nordby; Johnsen, Roy. (2016) The effect of a Magnetic Field on the Galvanic corrosion of NiAlBronze in Natural Seawater. NACE International Corrosion 2016 Conference & Expo . NACE International; Vancouver. 2016-03-06 - 2016-06-10.
Academic lecture

Olden, Vigdis; Johnsen, Roy; Zhang, Zhiliang. (2016) Hydrogen induced stress cracking (HISC). SINTEF and NTNU's Environmental Assisted Cracking workshop - SNEAC . SINTEF og NTNU; Trondheim. 2016-06-08 - 2016-06-10.
Academic lecture

Venkataraman, Shankar; Bengtsson Blucher, Daniel; Jakobi, Dietinde; Asteman, Dr. Henrik; Johnsen, Roy; Lange, Torstein. (2016) A New Cast Ni-Base Alloy Suitable for Severe Sour Service. NACE International Corrosion 2016 Conference & Expo . Nace International; Vancouver. 2016-03-06 - 2016-03-10.

2015

Academic lecture

Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2015) Corrosion of Thermally Sprayed Aluminum in Flowing Seawater. NACE Corrosion 2015 . NACE International; Dallas, Texas. 2015-03-15 - 2015-03-19.
Academic lecture

Iannuzzi, Mariano; Johnsen, Roy; Næss, Monika E. (2015) Use of electrochemical techniques to determine localized corrosion resistance of 25-wt% Cr Super Duplex Stainless Steels. 16th Nordic Corrosion Congress . Norwegian Corrosion Society; Stavanger. 2015-05-20 - 2015-05-22.
Academic lecture

Iannuzzi, Mariano; Johnsen, Roy; Næss, Monika E. (2015) Use of electrochemical techniques to determine the degree of σ-phase precipitation in Type 25Cr SDSS. CORROSION/15 . NACE International; Dallas. 2015-03-16 - 2015-03-19.
Academic lecture

Johnsen, Roy. (2015) Corrosion Challenges for the oil and gas industry in the State of Qatar. TMS Middle East – Mediterranean Materials Congress and Energy and Infrastructure Systems (MEMA 2015). . TMS; Doha. 2015-01-11 - 2015-01-14.
Academic lecture

Johnsen, Roy. (2015) Corrosion and hydrogen embrittlement in production systems – effect on process safety. Qatar Process Safety Symposium “Successfully Managing Changes for a safer future . College of North Atlantic Qatar; Doha. 2015-03-30 - 2015-03-31.
Lecture

Kheradmand, Nousha; Hajilou, Tarlan; Deng, Yun; Johnsen, Roy; Barnoush, Afrooz. (2015) In situ electrochemical-micro-compression test: An investigation of dislocation-grain boundary interaction in presence of hydrogen. TMS 2015, 144th Annual Meeting and Exhibition ; 2015-03-15 - 2015-03-19.
Lecture

Kheradmand, Nousha; Johnsen, Roy; Barnoush, Afrooz. (2015) Hydrogen Embrittlement in Advanced Materials for Oil and Gas Industry: A Nanomechanical Approach. TMS 2015, 144th Annual Meeting and Exhibition ; 2015-03-15 - 2015-03-19.

2014

Academic lecture

Andersen, Kjetil; Johnsen, Roy; Olsen, Jim Stian. (2014) Effect of grain size on HISC resistance in 25% Cr super duplex stainless steels. EFC20 . ESIS; TRONDHEIM. 2014-06-30 - 2014-07-04.
Academic lecture

Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2014) Corrosion of Thermally Sprayed Aluminium in Flowing Seawater. 10th European Symposium on Electrochemical Engineering . European Federation of Chemical Engineering; Cagliari. 2014-09-28 - 2014-10-02.
Academic lecture

Johnsen, Roy. (2014) Hydrogen embrittlement of corrosion resistant alloys in oil/gas environment. Oryx GTL Excellence Series in Chemical Engineering . Texas A&M Qatar; Doha. 2014-02-18 - 2014-02-18.
Academic lecture

Olden, Vigdis; Saai, Afaf; Jemblie, Lise; Johnsen, Roy. (2014) A finite element study of hydrogen diffusion in duplex stainless steel. Steel & Hydrogen Conference 2014 . Lode Duprez, Department Manager Metallurgy at OCAS, Zelzate; Gent. 2014-05-05 - 2014-05-07.
Academic lecture

Wesmann, Johan Andre; Johnsen, Roy; Espallargas, Nuria; Herland, j; Twist, Dag; Araki, H; Watanabe, M; Kuroda, Seiji. (2014) Investigation of oxide formation on sliding interfaces of WC-CoCr in relation to friction and wear. Foredrag - proceedings ; 2014-05-21 - 2014-05-23.

2013

Academic lecture

Barnoush, Afrooz; Zamanzade, Mohammad; Asgari, Masoud; Johnsen, Roy; Vehoff, Horst. (2013) Hydrogen embrittlement revisited by novel nanomechanical approach. DPG Spring Meeting of the Condensed Matter Section . German physic society (DPG); Regensburg. 2013-03-10 - 2013-03-15.
Academic lecture

Lange, Hans Iver; Johnsen, Roy; Gundersen, Gunnar. (2013) Sensitivity for fracture from defects in wires of bridge suspension cables. The 8th International cable supported bridge operators' conference, Edinburgh, Scotland ; 2013-06-03 - 2013-06-05.
Academic lecture

Wesmann, Johan Andre; Herland, j; Twist, Dag; Johnsen, Roy; Espallargas, Nuria. (2013) FRICTION EVOLUTION OF WC-CoCr THERMALLY SPRAYED COATINGS DURING DRY SLIDING IN DIFFERENT ENVIRONMENTS. International Tribology Symposium of IFToMM ; 2013-03-19 - 2013-03-21.
Academic lecture

Wesmann, Johan Andre; Herland, j; Twist, Dag; Johnsen, Roy; Espallargas, Nuria. (2013) Influence of environmental conditions on friction of WC-CoCr coatings. World Tribology Conference 2013 ; 2013-09-08 - 2013-09-13.
Academic lecture

Wesmann, Johan Andre; Twist, Dag; Johnsen, Roy; Espallargas, Nuria. (2013) Friction and wear of coatings for subsea valves. International Thermal Spray Conference 2013 ; 2013-05-13 - 2013-05-15.

2012

Academic lecture

Espallargas, Nuria; von der Ohe, Christian B.; Johnsen, Roy. (2012) Effect of fatigue on tribocorrosion of passive materials used in offshore drilling applications – new test rig combining cyclic/static bending and tribocorrosion. foredrag ; 2012-04-19 - 2012-04-20.
Popular scientific lecture

Johnsen, Roy. (2012) Corrosion and corrosion fatigue properties of aluminium components – Focus on oil & gas. Aluminium Workshop . Qatar University; Doha. 2012-05-12 - 2012-05-12.
Academic lecture

Johnsen, Roy. (2012) Hydrogen embrittlement of carbon steel and stainless steel. Materials and Science Engineering Symposium 2012 . Qatar University and Texas A&M; Doha. 2012-02-28 - 2012-02-28.
Academic lecture

Perez Ramirez, Pedro Agustin; Johnsen, Roy; Utne, Ingrid Bouwer. (2012) Probabilistic condition assessment of aging equipment considering the effect of operating conditions and maintenance. 31st International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2012) ; Rio de Janeiro. 2012-07-01 - 2012-07-06.

2011

Poster

Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2011) Effect of In-situ Hydrogen Charging on the Pulsed Plasma Nitriding Layer in Stainless steel. Nanomechanical Testing in Materials Research and Development . Engineering Conferences International (ECI 2011); Lanzarote, Canary Islands. 2011-10-09 - 2011-10-14.
Academic lecture

Bjørnsdotter, Marte; Holme, Caroline; Johnsen, Roy; Nisancioglu, Kemal. (2011) A simple approach for measuring slow rates of hydrogen entrainment and diffusion in metals. 220th ECS Meeting . The Electrochemical Society; Boston. 2011-10-09 - 2011-10-14.
Academic lecture

Bjørnsdotter, Marte; Holme, Caroline; Johnsen, Roy; Nisancioglu, Kemal. (2011) A simple electrochemical engineering approach for measuring very slow rates of hydrogen entrainment and diffusion in metals. 9th ESEE (European Symposium on Electrochemical Engineering) 2011 . The european federation of chemical engineering; Chania, Kreta. 2011-06-19 - 2011-06-23.
Academic lecture

Bjørnsdotter, Marte; Johnsen, Roy; Nisancioglu, Kemal. (2011) A simple method for measuring hydrogen entrainment and diffusion in stainless steel. Eurocorr (The European Corrosion Congress) 2011 . European Federation of Corrosion; Stockholm. 2011-09-04 - 2011-09-08.
Academic lecture

Johnsen, Roy. (2011) Replacement of "Hard Chrome" with HVOF on piston rods for offshore hydraulic sylinders. Nordic Conference on Thermal Spraying . Svetskommissionen; Trollhättan. 2011-04-13 - 2011-04-14.
Academic lecture

Johnsen, Roy; Espallargas, Nuria; von der Ohe, Christian B.. (2011) The effect of cyclic and static tensile stresses on the tribocorrosion behavior of austenitic and duplex stainless steels in marine environment. NACE Corrosion 2011 ; Houston. 2011-03-13 - 2011-03-17.
Academic lecture

Johnsen, Roy; Nyhus, B.; Kongsten, O.E.. (2011) Susceptibility of hydrogen induced stress cracking of duplex stainless steel at elevated temperature. NACE Corrosion 2011 ; Houston. 2011-03-13 - 2011-03-17.
Academic lecture

Mubarok, Fahmi; Puranen, Jouni; Vuoristo, Petri; Johnsen, Roy; Espallargas, Nuria. (2011) Effect of suspension characteristics on microstructure of suspension plasma sprayed SiC submicron coatings. International Thermal Spray Conference 2011 . DVS – German Welding Society, ASM International; Hamburg. 2011-09-27 - 2011-09-29.

2010

Popular scientific lecture

Johnsen, Roy. (2010) Corrosion related problems on the Norwegian Continental Shelf - Topside and subsea. Workshop on Corrosion Management . Petronas, Pertrad and Intsok; Kuala Lumpur. 2010-01-26 - 2010-01-27.
Popular scientific lecture

Johnsen, Roy. (2010) Improved corrosion protection of topside structures by thermal spraying. Workshop on Corrosion Management . Petronas, Pertrad and Intsok; Kuala Lumpur. 2010-01-26 - 2010-01-27.
Popular scientific lecture

Johnsen, Roy. (2010) Kan termisk sprøyting erstatte ”forkromming” på komponenter offshore?. Overflate 2010 . Korrosjonsteknisk Forening, Bergen / Overflateteknikk; Bergen. 2010-11-10 - 2010-11-11.
Popular scientific lecture

Johnsen, Roy. (2010) Thirty Years Experience with the use of stainless steels on the Norwegian Continental Shelf. 21st Seminar on Stainless Steel May 19th 2010 . Swerea/KIMAB; Stockholm. 2010-05-19 - 2010-05-19.
Academic lecture

Johnsen, Roy; Nisancioglu, Kemal. (2010) INFLUENCE OF TEMPERATURE AND HYDROSTATIC PRESSURE ON HYDROGEN DIFFUSIVITY AND PERMEABILITY IN 13%Cr SUPER MARTENSITIC STAINLESS STEEL UNDER CATHODIC PROTECTION. NACE Corrosion 2010 . NACE; San Antonio, Texas. 2010-03-13 - 2010-03-17.
Academic lecture

Skjellerudsveen, Magnus; Akselsen, Odd Magne; Olden, Vigdis; Johnsen, Roy. (2010) Effect of microstructure and temperature on hydrogen diffusion and trapping in X70 pipeline steel and its weldments. EuroCorr 2010 . Dechema; Moskva. 2010-09-13 - 2010-09-17.
Academic lecture

Smirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal. (2010) Effect of tensile stress on hydrogen permeation in 13% Cr super martensitic stainless steel. EuroCorr 2010 . Dechema; Moskva. 2010-09-13 - 2010-09-17.

2009

Academic lecture

Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2009) Protective Coatings Offshore: Introducing a risk based maintenance management system. Corrosion 2009 . NACE International; Atlanta. 2009-03-22 - 2009-03-26.
Academic lecture

Bjørgum, Astrid Jørgine; Knudsen, Ole Øystein; Johnsen, Roy. (2009) Zinc rich primers - Effect of zinc loading. EUROCORR 2009 . European Ferderation of Corrosion; Nice. 2009-09-07 - 2009-09-10.
Academic lecture

Espallargas, Nuria; Johnsen, Roy; von der Ohe, Christian B.. (2009) Tribocorrosion properties of super duplex stainless steel in 3.4% NaCl and H2SO4 0.5M solution. EUROCORR 2009 . European Federation of Corrosion; Nice. 2009-09-07 - 2009-09-10.
Academic lecture

Johnsen, Roy. (2009) Hydraulic piston rods for hash environment - Can 25% Cr super duplex stainless steel be the preffered material?. Corrosion Solution 2009 7th International Conference . ATI Wah Chang; Park City - Utah. 2009-09-20 - 2010-09-24.
Academic lecture

Johnsen, Roy; Nyhus, Bård; Kongstein, Ole Edvard. (2009) Effect of temperature on Hydrogen Induced Stress Cracking (HISC) of UNS S32750 under cathodic protection in seawater. EUROCORR 2009 . European Federation of Corrosion; NICE. 2009-09-07 - 2009-09-10.
Academic lecture

Johnsen, Roy; Stangeland, Helga Wiig. (2009) Cathodic Protection in Cold Seawater - current density requirements. Corrosion 2009 . NACE International; Atlanta, Georgia. 2009-03-22 - 2009-03-26.
Academic lecture

Johnsen, Roy; Vingsand, Håvard. (2009) Corrosion properties of UNS S32750, UNS N06022 and UNS N10276 in seawater. Corrosion 2009 . NACE International; Atlanta. 2009-03-22 - 2009-03-26.
Academic lecture

Rommetveit, Tarjei; Johnsen, Roy; Johansen, Tonni Franke; Baltzersen, Øystein. (2009) High resolution ultrasound thickness measurements through polyester coating and real-time process control. Corrosion 2009 . NACE International; Atlanta. 2009-03-22 - 2009-03-26.
Poster

Smirnova, Anna; Johnsen, Roy. (2009) New equipment for studying hydrogen diffusion in metals under varying temperature, stress/strain and hydrostatic pressure. EuroCorr2009 ; 2009-09-06 - 2009-09-10.
Academic lecture

Smirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal. (2009) Influence of calcareous deposits on hydrogen uptake in 13% Cr super martensitic stainless steel under cathodic protection. EuroCorr2009 ; 2009-09-06 - 2009-09-10.
Academic lecture

Smirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal. (2009) The influence of calcareous deposit on hydrogen uptake in 13% Cr super martensittic stainles steel under cathodic protection. EUROCORR 2009 . European Federation of Corrosion; Nice. 2009-09-07 - 2009-09-10.
Academic lecture

von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2009) Premature failure of riser tensioner piston rods exposed to offshore splash zone operation – status and review of critical multi-degradation factors. Corrosion 2009 . NACE International; Atlanta. 2009-03-22 - 2009-03-26.

2008

Academic lecture

Axelsen, Sten Bjarne; Røsseland, T.; Johnsen, Roy; Knudsen, Ole Øystein. (2008) Topcoat flaking - A mechanism study. NACE Corrosion 2008 ; New Orleans. 2008-03-16 - 2008-03-20.
Academic lecture

Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd; Nyhus, Bård. (2008) Influence of hydrogen from CP on the fracture susceptibility of 25% Cr duplex stainless steel - FE modeling of constant load testing using hydrogen influenced cohesive zone elements. ISOPE 2008 ; Vancouver. 2008-07-06 - 2008-07-11.
Academic lecture

Espallargas, Nuria; Johnsen, Roy; Lunde, Lars; Berget, Jon. (2008) Coatings for use in Telescopic Joint used in Workover riser systems. Eurocorr 2008 ; Edinburgh. 2008-09-07 - 2008-09-11.
Academic lecture

Johnsen, Roy. (2008) HISC testing of stainless components in seawater under cathodic protection. FESI-NPL Workshop "How best to qualify a material for resistance to hydrogen assisted cracking? . National Physical laboratory; Teddington. 2008-02-12 - 2008-02-12.
Academic lecture

Johnsen, Roy. (2008) Hydrogensprøhet for materialer i sjøvann - hva vet vi?. Oppshore Prosessanlegg og Rørledninger . Norsk Forening for Vedlikehold; Bergen. 2008-10-21 - 2008-10-22.
Academic lecture

Johnsen, Roy; Nyhus, Bård; Wästberg, Stig. (2008) HISC testing of stainless steels under cathodic protection in seawater. Aurocorr 2008 ; Edinburgh. 2008-09-07 - 2008-09-11.
Academic lecture

Johnsen, Roy; Vingsand, Håvard. (2008) Comparion of corrosion properties of UNS S32750, UNS N06022 and UNS N10276 in seawater. Eurocorr 2008 ; Edinburgh. 2008-09-07 - 2008-09-11.
Academic lecture

Okstad, Trine; Rannestad, Øyvind; Johnsen, Roy; Nisancioglu, Kemal. (2008) Significance of hydrogen evolution in cathodic protection of steel in seawater. XI. International Corrosion Symposium (KORSEM08) . Izmir University; Izmir. 2008-10-22 - 2008-10-25.
Academic lecture

Olden, Vigdis; Thaulow, Christian; Johnsen, Roy. (2008) FE modeling of hydrogen induced stress cracking in 25% Cr duplex stainless steel. 2008 International Hydrogen Conference ; Jackson Lake Lodge, Grand Teton National Park, Wyoming. 2008-09-07 - 2008-09-10.
Academic lecture

Rommetveit, Tarjei; Johnsen, Roy; Baltzersen, Øystein. (2008) Using ultrasound measurements for real-time process control of pipelines and process equipment subjected to corrosion and/or erosion. Corrosion 2008 . NACE International; New Orleans. 2008-03-16 - 2008-03-20.

2007

Academic lecture

Baltzersen, Øystein; Waag, Tor Inge; Johnsen, Roy; Ahlén, Carl Henrik; Tveit, Edd. (2007) Wall Thickness Monitoring of new and existing subsea pipelines using ultrasound. NACE Corrosion . NACE; 2007-01-01 - 2007-02-01.
Academic lecture

Bjørgum, Astrid Jørgine; Johnsen, Roy; Knudsen, Ole Øystein; Kvernbråten, Ann-Karin. (2007) Repair coating systems for bare steel: Effect of pre-treatment and conditions during application and curing. NACE Corrosion 2007 . NACE International; Nashville, TN. 2007-03-11 - 2007-03-15.
Academic lecture

Johnsen, Roy. (2007) Cathodic protection in natural seawater - current practice and effect on probability of hydrogen induced stress cracking. Konferanse . European Federation of Corrosion Event No. 289; Freiburg im Breisgau. 2007-09-09 - 2007-09-13.
Academic lecture

Johnsen, Roy; Baltzersen, Øystein; Waag, Tor Inge; Ahlén, Carl Henrik; Tveit, Edd. (2007) Wall thickness monitoring of new and existing subsea pipelines using ultrasound. NACE Corrosion 2007 . NACE International; Nashville, TX. 2007-03-11 - 2007-03-15.
Academic lecture

Johnsen, Roy; Berget, John; Nilsen, Tonelill. (2007) Influence of porosity on corrosion properties of thermally sprayed coatings. NACE Corrosion 2007 . NACE International; Nashville, TN. 2007-03-11 - 2007-03-15.
Academic lecture

Johnsen, Roy; Bjørgum, Astrid Jørgine; Knudsen, Ole Øystein; Kvernbråten, Ann-Karin. (2007) Bare steel maintenance offshore - effect of different mechanical pre-treatment methods. Eurocorr 2007 . European Federation of Corrosion Event No. 289; Freiburg im Breisgau. 2007-09-09 - 2007-09-13.
Academic lecture

Johnsen, Roy; Lauvstad, Gro Ø.; Asbjørnsen, Ingvild; Bjurstrøm, Martin; Hjort, Carl Gustav. (2007) The resistance towards hydrogen induced stress cracking (HISC) of hot isostatically pressed (HIP) duplex stainless steels under cathodic protection. Eurocorr 2007 . European Federation of Corrosion Event No. 289; Freiburg im Breisgau. 2007-09-09 - 2009-09-13.
Academic lecture

Johnsen, Roy; Nyhus, Bård; Wästberg, Stig; Lauvstad, Gro Ø.. (2007) New improved method for HISC testing of stainless steels under cathodic protection. NACE Corrosion 2007 . NACE International; Nashville, TN. 2007-03-11 - 2007-03-15.
Academic lecture

Johnsen, Roy; Okstad, Trine; Nicansioglu, Kemal; Rannestad, Øyvind. (2007) Significance of hydrogen evolution during cathodic protection. NACE Corrosion 2007 . NACE International; Nashville, TN. 2007-03-11 - 2007-03-15.
Academic lecture

Knudsen, Ole Øystein; Johnsen, Roy; Bjørgum, Astrid Jørgine; Polanco-Loria, Mario A.; Øyen, Anne. (2007) Internal stress and mechanical properties of pant films. NACE Corrosion 2007 . NACE International; Nashville, TN. 2007-03-11 - 2007-03-15.
Academic lecture

Lauvstad, Gro Ø.; Johnsen, Roy; Borch, Øyvind; Da Silva, Erik Falck; Walmsley, John C. (2007) Breakdown in passivity of austenitic stainless steels in Cl- and H2S - modeling and characterization of the pit initiation process. NACE Corrosion 2007 . NACE International; Nashville, TN. 2007-03-11 - 2007-03-15.
Academic lecture

Lauvstad, Gro Ø.; Johnsen, Roy; Nyhus, Bård. (2007) Improved resistance towards hydrogen induced stress cracking (HISC) of hot isostatically pressed (HIP) duplex stainless steels under cathodic protection. NACE Corrosion 2007 . NACE International; Nashville, TN. 2007-03-11 - 2007-03-15.
Academic lecture

Smirnova, Anna; Johnsen, Roy. (2007) Hydrogen Permeation in Super Martensitic and Duplex Stainless Steels under Cathodic Charging and Exposed to Artificial Seawater and 3.5% NaCl Solution. EuroCorr 2007 ; Freiburg. 2007-09-09 - 2007-09-13.

2006

Popular scientific lecture

Johnsen, Roy. (2006) Belegg for hydrauliske sylindere i marint miljø - Erfaringer og fremtidig behov. Materialdagen . Norges Forskningsråd og Sveiseteknisk Forening; Stavanger. 2006-10-25 - 2006-10-25.
Popular scientific lecture

Johnsen, Roy. (2006) Hva er korrosjon?. Strategisk Inspeksjonsstyring . Tekniske Foreningers Servicekontor; Stavanger. 2006-04-25 - 2006-04-26.
Academic lecture

Johnsen, Roy. (2006) Korrosjonstekniske utfordringer i oljeindustrien. Årsmøte i Norsk Forening for Vedlikehold . Norsk Forening for Vedlikerhold; Molde. 2006-05-10 - 2006-05-11.
Academic lecture

Johnsen, Roy; Berget, John; Rogne, Trond. (2006) Improved Corrosion Resistance of HVOF sprayed ceramic-metallic coatings. NACE CORROSION2006 . International Association of Corrosion Engineers; San Diego. 2006-03-12 - 2006-03-16.
Academic lecture

Johnsen, Roy; Mikkelsen, Andre; Wästberg, Stig; Nyhus, Bård; Rogne, Trond. (2006) Influence of ambient pressure on Hydrogen Induced Stress Cracking (HISC) of Duplex Stainless Steels under Cathodic Protection. NACE CORROSION 2006 . International Association of Corrosion Engineers; San Diego. 2006-03-12 - 2006-03-16.
Academic lecture

Johnsen, Roy; Nilsen, Anders Calder. (2006) Cathodic Protection of FPSO's - Current density requirements at potentials more negative than -1000 mV Ag/AgCl. NACE CORROSION 2006 . Intenational Association of Corrosion Engineers; San Diego. 2006-03-12 - 2006-03-16.
Academic lecture

Johnsen, Roy; Knudsen, Ole Øystein; Bjørgum, Astrid Jørgine; Frydenberg, Tone. (2006) Development of internal stress in organic coatings during curing and exposure. NACE CORROSION2006 . Intarnational Accosiation of Corrosion Engineers; San Diego. 2006-03-12 - 2006-03-16.

2005

Academic lecture

Johnsen, Roy. (2005) A New Multichannel Ultrasonic System for Subsea Corrosion amd Erosion Monitoring. CORROSION'2005 . NACE International; Houston TX. 2005-04-03 - 2005-04-07.
Academic lecture

Johnsen, Roy. (2005) HISC - Problemstillinger og utfordringer. Materialdagen 2005 . Stålmat / Norsk Sveiseteknisk Forening; Stavanger. 2005-10-26 - 2005-10-26.
Academic lecture

Johnsen, Roy. (2005) Hydrogen Induced Stress Cracking of Stainless Steels. EUROCORR'2005 . European Federation of Corrosion (EFC); Lisboa. 2005-09-05 - 2005-09-08.

2004

Academic lecture

Johnsen, Roy. (2004) Experience with the use of Copper Alloys in seawater systems in the Norwegian Sector of the North Sea. Eurocorr 2004 . European Federation of Corrosion; NICE. 2004-09-12 - 2004-09-16.
Popular scientific lecture

Johnsen, Roy. (2004) Korrosjonsproblem i offshore industrien - Hva har vi lært?. Materialdagen 2004 . Stålmat (NFR); Stavanger. 2004-10-27 - 2004-10-27.
Popular scientific lecture

Johnsen, Roy. (2004) Malingsvedlikehold - Verktøy for planlegging og utførelse. Overflatedagene 2004 . Teknologisk Institutt; Oslo. 2004-11-08 - 2004-11-10.
Popular scientific lecture

Johnsen, Roy. (2004) Robuste beleggsystem for offshore konstruksjoner. Bransjeseminar Materialer og Belegg . Norsk Korrosjonsteknisk Forening - Avd. Stavanger; Stavanger. 2004-05-25 - 2004-05-26.

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Roy Johnsen

Roy Johnsen

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