Interface migration during recrystallization: The role of recovery and stored energy gradients

Abstract

The interface migration rate behavior during recrystallization of a deformed$\left( {111} \right)[\bar 1\bar 12]$ iron single crystal is considered in detail. A spheroidal growth, site-saturated nucleation model of recrystallization is developed for iron which quantitatively takes into account the effect of concurrent recovery in the deformed regions ahead of the advancing recrystallization interfaces. The recovery kinetics model incorporated into the growth model was devised based on the experimental data of Michalak and Paxton.[10] Explanations are advanced for the nonlinear growth of grains during recrystallization of iron. Deformation-induced stored energy gradients are proposed to explain the aspects of nonlinear growth not accounted for by recovery and are introduced into the growth model also. A localized shear band deformation mechanism developed by Harataniet al.[14] is used to rationalize the presence of stored energy gradients in the deformed$\left( {111} \right)[\bar 1\bar 12]$ iron single crystal.