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 Karl Franzens University Graz

Graz University of Technology 

Modelling of softening processes during hot deformation of metals
Prof. Sommitsch
Institute for Materials Science and Welding, Graz University of Technology
17:15 - 18:15 Tuesday 10 November 2009 TUG P2

During the processing of metallic materials at relatively high homologous temperatures, hardening and softening processes interact by the production and annihilation of dislocations as well as by the formation of unstrained new grains. Recovery and recrystallization compete, the latter is more pronounced in alloys with relatively smaller stacking fault energy. Besides the classical primary recrystallization, i.e. cold deformation and annealing, dynamic, meta-dynamic as well as static recrystallization occur during the hot deformation and in the interpass time.
For the numerical modelling of the grain structure evolution during processing, continuous models have to be developed and coupled with finite element programmes in order to simulate both the grain structure evolution and the mechanical properties along the process chain. Besides purely phenomenological models, physical based approaches are of interest, which are able to describe both the dislocation density and substructure evolution during deformation.
In the lecture, grain structure models for both recovery and recrystallization driven materials will be presented.