MODELING of static recrystallization IN alloyed austenite with account of recovery

Abstract

To predict kinetics of static recrystallization with account of recovery and resulting grain size in alloyed austenite, a quantitative model is developed. Physically motivated, the model relates activation energy of the process with that of bulk self-diffusion. The known dependence of the latter on chemical composition of austenite solid solution, established previously, essentially simplifies the modeling. Employed empirical parameters have been fitted to relevant data covering a wide range of chemical compositions (12 steels) and sizes of recrystallized austenite grains. The model satisfactorily complies with experiments on steels whose apparent activation energy of recrystallization varies from 146.1 to 308.1 kJ/mol. It is notable as well that this performance has been achieved with no direct allowance for the pinning of grain boundaries by solute atoms (solute drag effect).