Investigation into Microstructure Evolution of Co–Ni–Cr–W–Based Superalloy During Hot Deformation

Hot compression tests were conducted using a Gleeble 3500 thermomechanical simulator at temperatures ranging from 1,000 to 1,200°C with the strain rate 0.1 10 s −1 . Electron backscatter diffraction (EBSD) technique was employed by investigating microstructure evolution during hot deformation. Microstructure observations reveal that deformation and rates have significant effect on DRX process. It is found fraction grain size of increase decreasing temperature, along increasing high-angle boundaries (HAGBs). The first decreases then increases rates. noted there are both nucleation mechanisms discontinuous dynamic recrystallization (DDRX) continuous (CDRX) process for Co–Ni–Cr–W–based superalloys. DDRX CDRX primary subsidiary DRX, respectively. also almost no DRX. At temperature above 1,150°C, complete occurred average sizes about 25.32–29.01 μm. homogeneity refinement can be obtained selecting suitable parameters.