Effects of the initial melt undercooling on solid-state recrystallization and grain growth processes in as-solidified superalloy

The effects of the initial melt undercooling on recrystallization and grain growth processes associated with high-undercooling rapid solidification in as-solidified superalloy were analyzed. δT determined the solidification process, solid-state recrystallization and grain growth processes. It was shown that the final grain size is strongly dependent on the response of material to recrystallization. The results show that with increasing δT, rapid solidification produces larger strain energy, provides stronger response to recrystallization, and thus leads to smaller grain size of the as-solidified materials.