Effect of thermal stability of γ′ phase on the recrystallization behaviors of Ni-based single crystal superalloys

Abstract The recrystallization may deteriorate the mechanical properties of single crystal superalloys greatly, which concerns the engineers and scientists in the aviation industry. Recrystallization behaviors after grit-blasting and annealing at different temperatures of a γ′-richen experimental single crystal alloy IC32 (the as-cast and heat-treated) were investigated. Samples of the as-cast ones are less prone to recrystallization than the heat-treated ones. In the as-cast state, the interdendritic regions show a stronger resistance to recrystallization than the dendritic regions. According to the results, we can conclude that the size characteristics and thermal stabilities of the γ′-phases play important roles in deciding the recrystallization resistances of the Ni-based single crystal superalloys.