Creep damage evaluation of gas turbine blade material by using SPring-8 synchrotron radiation

In this study, in order to provide the way to evaluate the creep damage of gas turbine hot-gas-path components, X-ray diffraction experiments were performed for creep deformed Ni-base superalloys for gas turbine blade applications by using synchrotron radiation at SPring-8, and the relations between creep damage and X-ray diffraction data were studied. It was found that X-ray diffraction line width increased with creep time. The proposed method was applied to a retired blade in which TBC separation was observed, and found that creep damage was not caused near TBC separation region. (author)