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

Abstract : 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 BMIS are then discussed. Finally, a method for evaluating the material parameters is described and illustrated by the example of 304L stainless steel.
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Submitted on : Friday, March 12, 2010 - 3:59:43 PM
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Olivier Lurdos, Frank Montheillet, Gilles Damamme. A grain scale approach for modeling steady-state discontinuous dynamic recrystallization. Acta Materialia, Elsevier, 2009, 57 (5), pp.1602-1612. ⟨10.1016/j.actamat.2008.11.044⟩. ⟨emse-00463547⟩



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