TMT4266 - Metal Fabrication and Forming - Microstructure and Crystal Plasticity

About

Examination arrangement

Examination arrangement: Written examination
Grade: Letters

Evaluation form Weighting Duration Examination aids Grade deviation
Written examination 100/100 4 hours D

Course content

Descriptions are given of: (i) Common materials in fabrication and forming processes. (ii) Features of fabrication and forming processes (iii) Microstructure and texture development. (iv) Constitutive relation (relation between stress, strain, strain rate and temperature) in a deformation gap (rolling, extrusion or forging). (iii) Technological test methods (physical simulation). An introduction is given to texture and crystal plasticity and the influence on anisotropic mechanical properties. Furthermore, forming properties of plates and profiles are handled (localisation of strain, formability diagrams and damage evolution) Industrial rolling, extrusion and forging processes are considered in relation to microstructure control. Tool friction geometry tolerances, end-product properties (aluminium) are also treated.

Learning outcome

After completing the course the student should be able to:
- Recognize a constitutive relation for hot forming.
- Derive and apply theory relating to torsion testing.
- Describe test methods for creep behavior.
- Deriving power law creep out from assumptions about vacansy diffusion and dislocation climb
- Derive Coble and Nabarro-Herring creep out from assumptions about vacancy diffusion.
- Constructing creep map of the normal creep mechanisms for pure metals.
- Perform basic life limitations wrt. creep.
- Evaluating the selection and parameters of process steps during extrusion of aluminum alloys.
- Choosing the appropriate mechanical tests and assess process step by forging.
- Sketching fcc unit cell orientation when a rolling texture is given and identify grain orientations in a pole figure.
- Constructing pole figures for fiber textures for axis symmetric stretching and compression from the knowledge of stable orientations in 001 inverse pole figures.
- Recognize common rolling and heat treatment textures for steel and aluminum alloys.
- Relate Euler angles, the rotation matrix and the ODF (Orientation Distribution Function) and recognize rolling textures in the ODF.
- Derive the Taylor model for texture development and calculation of the anisotropic stress.
- Discussing deep drawability from normal and planar anisotropy related to the r-values, the flow surface and texture. - Derive and apply criteria for diffuse necking and local instability in biaxial strain.
- Explain the ingredients in the Marciniak-Kuczynski theory for calculating a formability diagram.

Learning methods and activities

Lectures and exercises. Instruction is provided in English or Norwegian as needed. If the teaching is given in English the Examination papers will be given in English only. Students are free to choose Norwegian or English for written assessments.

Compulsory assignments

  • Exercises

Further on evaluation

If there is a re-sit examination, the examination form may be changed from written to oral.

Specific conditions

Exam registration requires that class registration is approved in the same semester. Compulsory activities from previous semester may be approved by the department.

Course materials

G.E. Dieter: Mechanical Metallurgy. Lecture notes.

Credit reductions

Course code Reduction From To
TMT4225 3.7 2008-09-01
TMT4265 3.7 2008-09-01

Timetable

Detailed timetable

Examination

Examination arrangement: Written examination

Term Statuskode Evaluation form Weighting Examination aids Date Time Room *
Spring ORD Written examination 100/100 D
  • * The location (room) for a written examination is published 3 days before examination date.
If more than one room is listed, you will find your room at Studentweb.