To obtain higher accuracy in FEM simulations the incorporation of
microstructure evolution models becomes more and more important. From the point
of view of metal physics it is well known that effects like recrystallization and
deformation texture have a big influence on the material properties,
especially the mechanical ones.
The present article will give an overview about parts of the research
activities in the Collaborative Research Centre (SFB 370) of the Deutsche
Forschungsgemeinschaft (DFG). Three different types of microstructure
models have been developed at the IMM and were coupled at the IBF to
an implicit FEM code.
The so-called flow-stress model is based on dislocation
density evolution to describe the flow curve of metals, mainly at high
temperatures. The Taylor-type model is able to describe deformation
texture during metal forming. The third model is a modified
cellular automaton to predict grain size and microstructure
evolution during static recrystallization.
The simulation of a rolling trial of the Al-alloy AA3104 including the
named three models has been made and the results will be validated with
experimental findings.
A through‐process modeling scheme for the prediction of recrystallization textures and microstructures after final annealing, subsequent to cold rolling is proposed and applied to a commercial AlFeSi alloy. The heart of the setup is a cellular automaton for modeling of recrystallization which considers changes in dislocation density by recovery and changes in Zener and solute drag due to microchemistry evolution. However, recrystallization is the crucial point in the whole setup, since it leads to significant changes in microstructure and texture. The simulated results are compared to experiments.
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