Insight into the Dynamic Recrystallization Behavior and Microstructure Evolution of MP159 Superalloy During Hot Deformation

The dynamic recrystallization behavior of MP159 superalloy was investigated by performing hot compression tests in the deformation temperature range of 920–1070 °C and strain rates of 0.01–10 s −1 . Processing maps were established based on flow curves, and the optimal hot processing region for MP159 alloy was identified at the deformation temperatures of 940–980 °C and a strain rate of 0.01 s −1 . The influence of the processing parameters (true strain, temperature and strain rate) on the microstructure evolution was studied. The volume fraction and grain size of recrystallized grains increased with increasing strain rate and deformation temperature. Deformation twins that formed during hot deformation provided nucleation sites for dynamic recrystallization (DRX) and accelerated the DRX process. Discontinuous dynamic recrystallization (DDRX) was the dominant mechanism for the MP159 alloy at different deformation strains. Graphic Abstract