2.1 Materials
FGH96 is a powder metallurgy nickel-based superalloy used to manufacture turbine discs of advanced aero engines. This alloy is similar to Rene 88DT, a second-generation powder metallurgy superalloy from the United States. The nominal composition of FGH96 is listed in Table 1. The 0.2% yield strength of FGH96 alloy at 600 ℃ is 1030 MPa. The fatigue limit at 600°C is 425 MPa and 763 MPa for R=-1 and R=0.05, respectively.
Table 1 The nominal composition of FGH96