Abstract: The microstructure and related property evolution induced by dynamic recrystallization (DRX) and static recrystallization (SRX) in thermo-mechanical process are two critical factors for the metal forming. The DRX and SRX are determined by the grain level deformation and sequentially coupled. In order to fully capture the microstructure and mechanical property evolution, a crystal plasticity finite element based modelling method for DRX and SRX is proposed in the current work. The grain level deformation is calculated with crystal plasticity which is coupled with the recrystallization model straightforwardly, and both the grain deformation and microstructure evolution are updated simultaneously. The proposed method is validated with discontinuous DRX experiments and the effects of initial deformation conditions are well-captured. Two controversial mechanisms for recrystallization microstructure evolution, i.e. oriented nucleation and growth selection, are discussed in the current framework with the advantages of accurate grain level deformation and interaction predictions. Furthermore, the sequentially coupled DRX and SRX are modelled seamlessly in the current work which provides a critical method for fully integrated thermo-mechanical processes analysis.

Key words: Dynamic recrystallization, Static recrystallization, Crystal plasticity finite element method, Microstructure, Growth selection