A thermodynamically consistent model for elastoplasticity, recovery, recrystallization and grain coarsening
L. Kertsch, D. Helm
Volume: 152 - 153. Pages: 185--195
DOI: 10.1016/j.ijsolstr.2018.06.026
Published: 2018
Abstract
We present a model for the thermomechanical behaviour and microstructure
evolution of metallic materials during thermomechanical processing.
Special emphasis is put on its derivation based on the Müller–Liu
procedure which ensures consistency with fundamental physical principles.
The model represents in principle the strong coupling between elastoplastic
deformation, recovery, recrystallization, grain coarsening and related
thermal effects. Furthermore, it takes the dragging effect of precipitates
on grain boundaries and dislocations into account by which a higher
strength can be achieved and the grain size is stabilised. For the
microstructure description, we use a mean-field approach. In several
numerical examples, we demonstrate the capability of the model to
consistently predict the interplay between elastoplastic deformation,
microstructure evolution, dynamic hardening and softening and the
related temperature change.