Effect of creep behavior on the Ni-based single crystal blade structure under abrupt loading conditions

The flight mission of aeroengines exhibits dynamic features during operation. It is crucial to consider the effect of abrupt loading conditions when evaluating the creep behavior of turbine blades. In this paper, the effect of variable temperature and stress on creep rupture behavior of Ni-based single crystal (SX) turbine blade simulator specimen was systematically studied by experimental and finite element analysis methods. The experimental results indicated that creep strain jump could be observed with increasing temperature and stress, accompanied by the new primary and secondary stages. The creep fracture mechanism and microstructure evolution were revealed by the macro and micro analysis of the specimen after failure. Based on the above research, the creep damage model considering the material degradation and voids damage was used to calculate and analyze the creep behavior of the blade-like specimen. The finite element simulation results are nearly consistent with the experimental fracture path of the specimen.