Dynamic recrystallization kinetics

AbstractDynamic recrystallization in two austenitic stainless steels has been monitored by (i) observations of the high-temperature stress/strain behaviour, and (ii) metallographic measurements on rapidly quenched, partially reacted specimens. Particular effort has been put into assessing the influence of pre-existing grain size on the kinetics of dynamic recrystallization at a specified temperature and strain rate. A theory due to Cahn, which is intended to describe the kinetics of transformations where nucleation is strictly confined to pre-existing grain boundaries, has been applied to the dynamic recrystallization problem. Some measure of agreement with observation is obtained but only on the proviso that proper attention is paid to repeated nucleation at the recrystallization front, and that a distinct variation of active grain boundary area during the reaction is recognized and considered.