2023

• Academic lecture
  Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2023) Hydrogen diffusion in X65 pipeline steels. SINTEF/NTNU/Kyushu University SNEAC - Environmental assisted cracking workshop , Trondheim 2023-06-06 - 2023-06-08
• Academic lecture
  Olden, Vigdis; Alvaro, Antonio; Nyhus, Bård; Hagen, Anette Brocks; Johnsen, Roy; Di, Wan. (2023) Hydrogen embrittlement in subsea pipelines - From natural gas to hydrogen gas transport. Engineering Conferences International International Hydrogen Conference 2023 , Park City, Utah, USA 2023-09-17 - 2023-09-21
• Academic lecture
  Johnsen, Roy; Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Lu, Xu; Wang, Dong. (2023) Main take aways from the HYLINE project WP1 - Relationship between gaseous and electrochemical hydrogen charging of X65 pipeline steel using the permeation technique. SINTEF INDUSTRI og NTNU SNEAC II - NTNU/SINTEF , Trondheim 2023-06-07 - 2023-06-08
• Academic lecture
  Lu, Xu; Ma, Yan; Ma, Yuan; Johnsen, Roy. (2023) H-assisted failure in nickel alloys and possible mitigation approaches . 19th Asian Pacific Corrosion Control Conference 2023-11-17 - 2023-11-18

2022

• Academic lecture
  Johnsen, Roy. (2022) Hydrogen uptake and embrittlement of X65 pipeline steel. Qatar Environment and Energy Research Institute (QEERI) Material Science day at Qatar Environment and Energy Research Institute (QEERI) , Doha, Qatar 2022-09-15 - 2022-09-15
• 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. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-06 - 2022-03-10
• Lecture
  Johnsen, Roy; Salasi, Mobin; Iannizzi, Mariano; Andersen, Kjetil; Krosness, Ola. (2022) Calcareous deposition on thermally sprayed aluminum surfaces. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-05 - 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. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-05 - 2022-03-10
• 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. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-06 - 2022-03-10
• 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
  Nyhus, Bård; Alvaro, Antonio; Myhre, Aleksander Omholt; Hagen, Anette Brocks; Wang, Dong; Koren, Erik Aas. (2022) Hydrogen-materials research on the influence of pressurized H2 gas on pipeline steel - Recent results from the HyLINE project. Norsk Petroleumsforening Subsea Pipelines & Cables , Trondheim 2022-10-11 - 2022-10-12
• Lecture
  Olden, Vigdis; Vinogradov, Alexei; Johnsen, Roy; Zhang, Zhiliang; Alvaro, Antonio; Hagen, Catalina Hoem Musinoi. (2022) Hydrogen embrittlement resistance of X65 pipeline steel – recent results from the HyLINE project. Norsk Forening for vedlikehold Robust materialvalg i energisektoren , Quality Hotel Olavsgaard, Skjetten 2022-04-04 - 2022-04-05
• Academic lecture
  Olden, Vigdis; Vinogradov, Alexei; Johnsen, Roy; Zhang, Zhiliang; Alvaro, Antonio; Hagen, Catalina Hoem Musinoi. (2022) Hydrogen embrittlement resistance of X65 pipeline steels - Results from the HyLINE project. HYDROGENIUS, I2CNER, HYDROMATE AND SINTEF HYDROGEN-MATERIALS INTERACTIONS - HYDROGENIUS, I2CNER, HYDROMATE AND SINTEF JOINT RESEARCH SYMPOSIUM 2022 , Fukuoka, Kyushu Universitet 2022-01-27 - 2022-01-28
• Academic lecture
  Lu, Xu; Johnsen, Roy. (2022) H-assisted failure in nickel alloys and possible mitigation approach. Swerim 4th Sweden hydrogen seminar 2022-10-27 - 2022-10-27
• Academic lecture
  Lu, Xu; Johnsen, Roy. (2022) Hydrogen diffusion and trapping in nickel Alloys 625 and 725. NTNU HEiNS symposium , Trondheim 2022-12-05 - 2022-12-06
• 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
  Alvaro, Antonio; Myhre, Aleksander Omholt; Olden, Vigdis; Hagen, Anette Brocks; Wang, Dong; Nyhus, Bård. (2022) Mechanical performance of subsea pipeline steels for hydrogen transport application. OCAS International Conference on Metals and Hydrogen , Ghent 2022-10-11 - 2022-10-13
• 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. European Structural Integrity Society ECF23, European Conference on Fracture 2022 , 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​. European Federation of Corrosion EUROCORR2022 , Berlin, Tyskland 2022-08-28 - 2022-09-01

2021

• 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) Study on hydrogen trapping and diffusion in nickel alloys. NTNU Academic Seminar on the M-HEAT project , NTNU 2021-06-15 - 2021-06-15
• Academic lecture
  Lu, Xu; Johnsen, Roy. (2021) Evaluation of hydrogen diffusion behavior in nickel alloy 625. NTNU Academic Seminar on the M-HEAT project , NTNU 2021-03-23 - 2021-03-23
• 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 International/AMMP NACE Corrosion 2021 , Salt Lake City, USA 2021-04-19 - 2022-01-30

2017

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

2016

• Academic lecture
  Johnsen, Roy. (2016) Hydrogen Induced Stress Cracking of Duplex Stainless Steel under Cathodic Protection in Seawater – Historical overview and Lessons Learned. ACerS, AIST, ASM International, TMS, NACE International Material Science & TEchnology 2016 , Salt Lake City 2016-10-23 - 2016-10-27
• 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
  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 NACE International Corrosion 2016 Conference & Expo , Vancouver 2016-03-06 - 2016-03-10
• 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 NACE International Corrosion 2016 Conference & Expo , Vancouver 2016-03-06 - 2016-06-10
• 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 NACE International Corrosion 2016 Conference & Expo , Vancouver 2016-03-06 - 2016-03-10
• Lecture
  Johnsen, Roy; Iannuzzi, Mariano. (2016) Distributed Sacrificial Anode (DSA) – a new cost effective solution for corrosion protection of structures in seawater . Norsk Korrosjonsteknisk Forening, Stavanger avdeling Materialdagen , Stavanger 2016-06-02 - 2016-06-03
• 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. Norsk Materialteknisk Selskap/Norsk Metallografisk Forening Nasjonal Konferanse for Materialteknologi , Trondheim 2016-08-24 - 2016-08-25
• Academic lecture
  Johnsen, Roy; Stenerud, Gaute; Barnoush, Afrooz; Olsen, Jim Stian. (2016) In Situ Electrochemical Nanoindentation of Alloy 718. European Federation of Corrosion EUROCORR 2016 , Montpellier 2016-09-11 - 2016-09-15
• 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. European Federation of Corrosion EUROCORR/16 , Montpellier 2016-09-11 - 2016-09-15
• Academic lecture
  Olden, Vigdis; Johnsen, Roy; Zhang, Zhiliang. (2016) Hydrogen induced stress cracking (HISC) . SINTEF og NTNU SINTEF and NTNU's Environmental Assisted Cracking workshop - SNEAC , Trondheim 2016-06-08 - 2016-06-10
• 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. European Federation of Corrosion EUROCORR 2016 , Montpellier 2016-09-11 - 2016-09-15

2015

• 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. NACE International CORROSION/15 , Dallas 2015-03-16 - 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. Norwegian Corrosion Society 16th Nordic Corrosion Congress , Stavanger 2015-05-20 - 2015-05-22
• Academic lecture
  Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2015) Corrosion of Thermally Sprayed Aluminum in Flowing Seawater. NACE International NACE Corrosion 2015 , Dallas, Texas 2015-03-15 - 2015-03-19
• 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
• Academic lecture
  Johnsen, Roy. (2015) Corrosion Challenges for the oil and gas industry in the State of Qatar. TMS TMS Middle East – Mediterranean Materials Congress and Energy and Infrastructure Systems (MEMA 2015). , Doha 2015-01-11 - 2015-01-14
• Academic lecture
  Johnsen, Roy. (2015) Corrosion and hydrogen embrittlement in production systems – effect on process safety. College of North Atlantic Qatar Qatar Process Safety Symposium “Successfully Managing Changes for a safer future , Doha 2015-03-30 - 2015-03-31

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. ESIS EFC20 , TRONDHEIM 2014-06-30 - 2014-07-04
• Academic lecture
  Olden, Vigdis; Saai, Afaf; Jemblie, Lise; Johnsen, Roy. (2014) A finite element study of hydrogen diffusion in duplex stainless steel. Lode Duprez, Department Manager Metallurgy at OCAS, Zelzate Steel & Hydrogen Conference 2014 , Gent 2014-05-05 - 2014-05-07
• Academic lecture
  Johnsen, Roy. (2014) Hydrogen embrittlement of corrosion resistant alloys in oil/gas environment. Texas A&M Qatar Oryx GTL Excellence Series in Chemical Engineering , Doha 2014-02-18 - 2014-02-18
• Academic lecture
  Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2014) Corrosion of Thermally Sprayed Aluminium in Flowing Seawater. European Federation of Chemical Engineering 10th European Symposium on Electrochemical Engineering , Cagliari 2014-09-28 - 2014-10-02
• Academic lecture
  Wesmann, Johan Andre; Johnsen, Roy; Espallargas, Nuria; Herland, j; Twist, Dag; Araki, H. (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
  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; 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
• 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; 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
  Barnoush, Afrooz; Zamanzade, Mohammad; Asgari, Masoud; Johnsen, Roy; Vehoff, Horst. (2013) Hydrogen embrittlement revisited by novel nanomechanical approach. German physic society (DPG) DPG Spring Meeting of the Condensed Matter Section , Regensburg 2013-03-10 - 2013-03-15

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
• 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
• Academic lecture
  Johnsen, Roy. (2012) Hydrogen embrittlement of carbon steel and stainless steel. Qatar University and Texas A&M Materials and Science Engineering Symposium 2012 , Doha 2012-02-28 - 2012-02-28
• Popular scientific lecture
  Johnsen, Roy. (2012) Corrosion and corrosion fatigue properties of aluminium components – Focus on oil & gas. Qatar University Aluminium Workshop , Doha 2012-05-12 - 2012-05-12

2011

• Academic lecture
  Johnsen, Roy. (2011) Replacement of "Hard Chrome" with HVOF on piston rods for offshore hydraulic sylinders. Svetskommissionen Nordic Conference on Thermal Spraying , Trollhättan 2011-04-13 - 2011-04-14
• 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. Engineering Conferences International (ECI 2011) Nanomechanical Testing in Materials Research and Development , 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. The Electrochemical Society 220th ECS Meeting , 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. The european federation of chemical engineering 9th ESEE (European Symposium on Electrochemical Engineering) 2011 , 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. European Federation of Corrosion Eurocorr (The European Corrosion Congress) 2011 , Stockholm 2011-09-04 - 2011-09-08
• 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. DVS – German Welding Society, ASM International International Thermal Spray Conference 2011 , Hamburg 2011-09-27 - 2011-09-29
• 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

2010

• 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. Dechema EuroCorr 2010 , Moskva 2010-09-13 - 2010-09-17
• Popular scientific lecture
  Johnsen, Roy. (2010) Thirty Years Experience with the use of stainless steels on the Norwegian Continental Shelf. Swerea/KIMAB 21st Seminar on Stainless Steel May 19th 2010 , Stockholm 2010-05-19 - 2010-05-19
• Popular scientific lecture
  Johnsen, Roy. (2010) Kan termisk sprøyting erstatte ”forkromming” på komponenter offshore?. Korrosjonsteknisk Forening, Bergen / Overflateteknikk Overflate 2010 , Bergen 2010-11-10 - 2010-11-11
• Popular scientific lecture
  Johnsen, Roy. (2010) Corrosion related problems on the Norwegian Continental Shelf - Topside and subsea. Petronas, Pertrad and Intsok Workshop on Corrosion Management , Kuala Lumpur 2010-01-26 - 2010-01-27
• 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 NACE Corrosion 2010 , San Antonio, Texas 2010-03-13 - 2010-03-17
• Academic lecture
  Smirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal. (2010) Effect of tensile stress on hydrogen permeation in 13% Cr super martensitic stainless steel. Dechema EuroCorr 2010 , Moskva 2010-09-13 - 2010-09-17
• Popular scientific lecture
  Johnsen, Roy. (2010) Improved corrosion protection of topside structures by thermal spraying. Petronas, Pertrad and Intsok Workshop on Corrosion Management , Kuala Lumpur 2010-01-26 - 2010-01-27

2009

• Academic lecture
  Johnsen, Roy; Stangeland, Helga Wiig. (2009) Cathodic Protection in Cold Seawater - current density requirements. NACE International Corrosion 2009 , Atlanta, Georgia 2009-03-22 - 2009-03-26
• 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. European Federation of Corrosion EUROCORR 2009 , NICE 2009-09-07 - 2009-09-10
• Academic lecture
  Bjørgum, Astrid Jørgine; Knudsen, Ole Øystein; Johnsen, Roy. (2009) Zinc rich primers - Effect of zinc loading. European Ferderation of Corrosion EUROCORR 2009 , Nice 2009-09-07 - 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. European Federation of Corrosion EUROCORR 2009 , 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?. ATI Wah Chang Corrosion Solution 2009 7th International Conference , Park City - Utah 2009-09-20 - 2010-09-24
• 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. European Federation of Corrosion EUROCORR 2009 , Nice 2009-09-07 - 2009-09-10
• Academic lecture
  Johnsen, Roy; Vingsand, Håvard. (2009) Corrosion properties of UNS S32750, UNS N06022 and UNS N10276 in seawater. NACE International Corrosion 2009 , 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. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
• 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
  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. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
• Academic lecture
  Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2009) Protective Coatings Offshore: Introducing a risk based maintenance management system. NACE International Corrosion 2009 , 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

2008

• 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. NACE International Corrosion 2008 , New Orleans 2008-03-16 - 2008-03-20
• Academic lecture
  Okstad, Trine; Rannestad, Øyvind; Johnsen, Roy; Nisancioglu, Kemal. (2008) Significance of hydrogen evolution in cathodic protection of steel in seawater. Izmir University XI. International Corrosion Symposium (KORSEM08) , Izmir 2008-10-22 - 2008-10-25
• 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
  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. (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
  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
  Johnsen, Roy. (2008) Hydrogensprøhet for materialer i sjøvann - hva vet vi?. Norsk Forening for Vedlikehold Oppshore Prosessanlegg og Rørledninger , Bergen 2008-10-21 - 2008-10-22
• Academic lecture
  Johnsen, Roy. (2008) HISC testing of stainless components in seawater under cathodic protection. National Physical laboratory FESI-NPL Workshop "How best to qualify a material for resistance to hydrogen assisted cracking? , Teddington 2008-02-12 - 2008-02-12

2007

• Academic lecture
  Johnsen, Roy; Okstad, Trine; Nicansioglu, Kemal; Rannestad, Øyvind. (2007) Significance of hydrogen evolution during cathodic protection. NACE International NACE Corrosion 2007 , 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 International NACE Corrosion 2007 , 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 International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
• 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 International NACE Corrosion 2007 , Nashville, TX 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. European Federation of Corrosion Event No. 289 Konferanse , Freiburg im Breisgau 2007-09-09 - 2007-09-13
• 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. European Federation of Corrosion Event No. 289 Eurocorr 2007 , Freiburg im Breisgau 2007-09-09 - 2007-09-13
• 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 International NACE Corrosion 2007 , 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 International NACE Corrosion 2007 , Nashville, TN 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 International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
• 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 International NACE Corrosion 2007 , 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
• 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. European Federation of Corrosion Event No. 289 Eurocorr 2007 , Freiburg im Breisgau 2007-09-09 - 2009-09-13
• 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 NACE Corrosion 2007-01-01 - 2007-02-01

2006

• Academic lecture
  Johnsen, Roy; Berget, John; Rogne, Trond. (2006) Improved Corrosion Resistance of HVOF sprayed ceramic-metallic coatings. International Association of Corrosion Engineers NACE CORROSION2006 , San Diego 2006-03-12 - 2006-03-16
• Academic lecture
  Johnsen, Roy. (2006) Korrosjonstekniske utfordringer i oljeindustrien. Norsk Forening for Vedlikerhold Årsmøte i Norsk Forening for Vedlikehold , Molde 2006-05-10 - 2006-05-11
• 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. Intenational Association of Corrosion Engineers NACE CORROSION 2006 , 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. Intarnational Accosiation of Corrosion Engineers NACE CORROSION2006 , 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. International Association of Corrosion Engineers NACE CORROSION 2006 , San Diego 2006-03-12 - 2006-03-16
• Popular scientific lecture
  Johnsen, Roy. (2006) Hva er korrosjon?. Tekniske Foreningers Servicekontor Strategisk Inspeksjonsstyring , Stavanger 2006-04-25 - 2006-04-26
• Popular scientific lecture
  Johnsen, Roy. (2006) Belegg for hydrauliske sylindere i marint miljø - Erfaringer og fremtidig behov. Norges Forskningsråd og Sveiseteknisk Forening Materialdagen , Stavanger 2006-10-25 - 2006-10-25

2005

• Academic lecture
  Johnsen, Roy. (2005) HISC - Problemstillinger og utfordringer. Stålmat / Norsk Sveiseteknisk Forening Materialdagen 2005 , Stavanger 2005-10-26 - 2005-10-26
• Academic lecture
  Johnsen, Roy. (2005) A New Multichannel Ultrasonic System for Subsea Corrosion amd Erosion Monitoring. NACE International CORROSION'2005 , Houston TX 2005-04-03 - 2005-04-07
• Academic lecture
  Johnsen, Roy. (2005) Hydrogen Induced Stress Cracking of Stainless Steels. European Federation of Corrosion (EFC) EUROCORR'2005 , 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. European Federation of Corrosion Eurocorr 2004 , NICE 2004-09-12 - 2004-09-16
• Popular scientific lecture
  Johnsen, Roy. (2004) Robuste beleggsystem for offshore konstruksjoner. Norsk Korrosjonsteknisk Forening - Avd. Stavanger Bransjeseminar Materialer og Belegg , Stavanger 2004-05-25 - 2004-05-26
• Popular scientific lecture
  Johnsen, Roy. (2004) Malingsvedlikehold - Verktøy for planlegging og utførelse. Teknologisk Institutt Overflatedagene 2004 , Oslo 2004-11-08 - 2004-11-10
• Popular scientific lecture
  Johnsen, Roy. (2004) Korrosjonsproblem i offshore industrien - Hva har vi lært?. Stålmat (NFR) Materialdagen 2004 , Stavanger 2004-10-27 - 2004-10-27