Abstract: By adjusting the process parameters, combined with analysis of mechanical properties and microstructure, the hot working process of GH4169 superalloy was studied. The results show that the segregation between dendrites can be improved by adjusting the homogenization treatment process. The size-mixed grains can be improved when the forging ratio is greater than or equal to 3. The mechanical properties of the GH4169 superalloy can be significantly improved by medium temperature deformation heat treatment process. Billet forging at(1130-1160) ℃+medium temperature rolling heat treatment at(980-1020) ℃ (water cooling) +direct aging can improve the mechanical properties of the alloy, the tensile strength and hardness can reach 1350 MPa and 50 HRC, respectively.

Key words: GH4169 superalloy, segregation, forging ratio, medium temperature deformation heat treatment, mechanical properties