Thermodynamically consistent modelling of recrystallization and grain coarsening in precipitation-hardened alloys
L. Kertsch, D. Helm
Volume: 17. Pages: 425--426
DOI: 10.1002/pamm.201710182
Published: 2017
Abstract
The strength of technically relevant alloys is mainly determined
by the grain size distribution, the amount and size of precipitates,
solid-solution hardening and work hardening. A reliable material
model to capture these effects should be formulated within a comprehensive
thermodynamic framework. The strategy of rational extended thermodynamics
is applied to derive a thermodynamically consistent model representing
the coupling between elastoplastic deformation, the evolution of
the grain structure and recrystallization. In addition, the model
takes the dragging effect of precipitates on grain boundaries and
dislocations into account, which leads to significant strengthening.
For the microstructure description, a mean-field approach is used.
Due to the thermodynamic framework, the model is able to consistently
predict the interplay between deformation, microstructure evolution,
dynamic hardening and softening and the related temperature change.
(© 2017 Wiley-VCH Verlag GmbH \& Co. KGaA, Weinheim)