Abstract

Loading frequency dependence of near-threshold fatigue crack growth behavior at elevated temperature, was examined in the air and in a vacuum in Ni-based Superalloy. It was found that crack growth behavior at 800℃, 850℃, and 900℃ in the air and 900°C in a vacuum was dependent on loading frequency, while crack growth behavior at 800°C and 850℃ in a vacuum was independent of loading frequency.

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