Phase-field and dislocation-based crystal plasticity FE analysis on mechanical responses of TWIP steel considering nucleation conditions of deformation twin

Abstract

TWIP (twinning-induced plasticity) steels have attracted attention as a useful structural material that retains sufficient ductility even when strengthened by grain refinement because of the effect of deformation twinning that occurs inside the material. However, the strength of TWIP steels has conventionally been calculated by artificially arranging twin nuclei. In this study, the nucleation conditions of twin proposed by Shimokawa based on the MD method are applied to a polycrystal of TWIP steel. Then, the phase-field and dislocation-based crystal plasticity FEM analyses are performed to investigate the effects of nucleation and growth of twin on the strength and ductility of TWIP steel.