Effect of Alloy States on the Recrystallization Behavior in Single Crystal Superalloy

Recrystallization behavior after indentation loading and heat treatment at different temperatures of the as-cast and solution-treated alloy was investigated. The results showed that slip deformation occurred in the as-cast and heat treated samples after deformation and apparent slip line can be observed. Slip lines of heat treatment state was significantly more than that of the as-cast samples. Neither equiaxed nor cellular recrystallization occurred in the surface of the as-cast and solution-treated samples after heat treatment at 1120; Slip traces were examined in the vicinity of indentation and M 6 C carbide precipitated on the slip line in heat-treated samples, while cellular recrystallization occurred in the internal part and MC carbides became the nucleation centers. Equiaxed recrystallization occurred simultaneously in samples of the two states with the heat treatment at 1310 after deformation and the recrystallization area increased with the processing time; after heat treatment with same time and temperature, recrystallization area of the cast samples were less than that of heat-treated samples.