A grain scale approach for modeling steady-state discontinuous dynamic recrystallization

作者：Montheillet F^*; Lurdos O; Damamme G

来源：Acta Materialia, 2009, 57(5): 1602-1612.

DOI：10.1016/j.actamat.2008.11.044

• Modeling
• Analytical methods
• Hot working
• Dynamic recrystallization
• Grain-boundary migration

Discontinuous dynamic recrystallization (DDRX) generally occurs in low-stacking-fault-energy metals. New grains nucleate and grow at the expense of the strain-hardened older grains. A steady-state flow stress independent of initial conditions is experimentally observed. A general model is proposed to describe these phenomena. While the transient behavior can be addressed only numerically, a steady state is described in detail by closed-form relationships. The approach includes strain hardening and dynamic recovery, nucleation, growth and shrinkage of grains. Furthermore, the strain-hardening equation can be supplemented to account for the effect of boundary-migration-induced softening (BMIS). The present paper first states the general equations of the model some simple strain-hardening laws neglecting BM IS are then discussed. Finally, a method for evaluating the material parameters is described and illustrated by the example of 304L stainless steel.

• 出版日期2009-3
• 单位中国地震局