Characterization of hot compression behavior of a new HIPed nickel-based P/M superalloy using processing maps

Compression behavior and microstructure evolution of a PM nickel-based superalloy. (a) Compression true stress-strain plots upon strain rate 1.0 s− 1 in a wide range of temperature from 1000 °C-1100 °C, showing the relationship between temperature and stress. (b) The processing map based on true stress-strain at different temperatures and strain rates demonstrating the instability domains and stability regions. (c) Post-mortem compression morphologies under different deformation conditions. (d) At 1050 °C/1 s− 1, EBSD micrograph showing the microstructure of recrystallization. (e) A closer-up microscopic examination further demonstrates that the necklace-like grain boundary structure is developed due to the recrystallization stimulus.