A polycrystal plasticity based discontinuous dynamic recrystallization simulation method and its application to copper

Abstract

A straightforward approach integrating a visco-plastic self-consistent (VPSC) model with a phenomenological dynamic recrystallization (DRX) criterion is proposed for coupling simulation of hot deformation and accompanying DRX. The phenomenological DRX nucleation and growth criteria are embedded into VPSC through a dislocation density based hardening model. The approach is validated and demonstrated by simulating compression of polycrystal copper at various conditions. The key characteristics of DRX during hot deformation of copper, in terms of mechanical response and microstructure evolution, are well reproduced and illustrated with the VPSC-DDRX coupling simulation approach. Furthermore, a series of numerical studies on the hot deformation behaviors corresponding to different loading paths and initial textures are carried out to explore their effects on dynamic recrystallization and further demonstrate the capability of the proposed method. The innovation of current work is establishing a relatively simple crystal plasticity based DRX simulation method that incorporates crystal information, deformation modes and grain population, and realizes integrated computation of deformation, texture and DRX process.