抄録
Loading waveform dependence of near-threshold fatigue crack growth behavior of Ni-based superalloy at elevated temperatures was examined in the air and in a vacuum using constant Kn. and ΔK decreasing test method. It was found that the crack growth behavior at 850℃ and 900℃ on both environments was dependent on loading waveform. A difference was observed in appearance of fracture surfaces in correspondence to each C-P and P-C waveform at 850℃ in the air.
