Phase-field and dislocation-crystal plasticity FE analysis on grain size dependency of microstructural evolution and mechanical response for TRIP steels

Abstract

TRIP (Transformation-induced plasticity) steels have attracted attention as a structural material that can achieve both strength and ductility in ultrafine-grained materials through deformation-induced martensitic transformation. However, there are few examples of numerical analysis of the grain size dependence of the mechanical response of TRIP steels. In this study, the authors introduce the grain size dependence of the energy barrier and dislocation mobility of phase transformation in our phase-field and dislocation-crystal plasticity model, and change the annihilation distance of dislocations for each phase to predict computationally the grain size dependence of microstructural evolution and mechanical properties of TRIP steels.