Abstract：The aero-engine with high thrust-weight ratio needs to operate under higher temperature. In order to meet the requirements of high performance aero-engine, the alloying degree and mass fraction of γ′ phase keep increasing in the development of new wrought superalloy with higher service temperature. GH4151, GH4175 and GH4975 are typical nickelbase wrought superalloys with service temperature up to 800℃ . In present work, the domestic and overseas development of hard-to-deform superalloy is summarized. The characteristics of the three typical hard-to-deform nickel-base superalloy with high γ′ phase content are compared. In addition, the cogging technology and superplasticity characteristics of hard-todeform superalloy are discussed in detail. In summary, in order to fulfill the advantages of hard-to-deform superalloy with high γ′ phase content for turbine disk served above 800℃, there is still much research work need to be done in chemical composition and microstructure characteristics, characteristics of γ′ phase and control mechanism during hot deformation and superplasticity of the alloy
2021, 
