The Role of Annealing Twins in the Dynamic Recrystallization of an Austenitic Fe-Ni Alloy

Abstract

Dynamic recrystallization mechanisms have been studied in a fully austenitic Fe-33% Ni alloy, using the orientation analysis of individual recrystallized grains. The dynamic recrystallization has been found to start in the form of bulging of existing boundaries, similarly to the static recrystallization at low deformation strains, and multiple annealing twins have been formed at the growth front. Appart from the twin boundaries, twinning has resulted in the formation of new high angle boundaries, which controlled the growth of recrystallized grains.
Evidence has been found suggesting that twins are formed by chance during the boundary migration, and the twinning probability is nearly constant except for some large grains having preferred orientations, where twinning is suppressed. Schmid factor analysis has been unsuccessful to prove possible mechanical effects of twinning based on the applied compressive stress.