A modern and robust methodology for modeling anisotropic creep characteristics of Ni-based DS and SC superalloys

According to more recent work, the Wilshire equations have shown good prediction accuracy in a wide range of materials and stress-temperature conditions, particularly in extrapolation of short term results to long term predictions. In the current paper, this methodology was further developed for modeling anisotropic creep characteristics (i.e. minimum creep strain \(\dot \varepsilon _{\min } \), stress rupture life t f and time to a specified strain t ɛ ) of four typical Ni-based directionally solidified (DS) and single crystal (SC) superalloys, where a simple orientation factor related to the ultimate tensile strength (UTS) was introduced. The application of these simplistic approaches showed that the anisotropic creep characteristics in a wide range of stress-temperature conditions can be accurately simulated. Meanwhile, during the application of the modified Wilshire equations, break points occurring at the specified stress levels agree well with the transition of creep deformation mechanisms occurring in different stress regions, which provides confidence for using this method.