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