Characteristic surface oxide film cracking behavior of a Fe-Ni-Cr Alloy under in-phase and out-of-phase thermo-mechanical fatigue

Abstract

The surface oxide film cracking behavior of Fe-30Ni-20Cr alloy under in-phase and out-of-phase synchronizing thermal cycling with mechanical cycling was studied. Surface oxide film cracking along the grain boundary under in-phase overlapping was creep predominant fracture mechanisms. Strongly induced slip lines preceding were accompanied by the surface oxide film cracking under Out-of phase, and the shear cracking was dominant mode. Negative mean stress could counteract a part of the tensile component of alternative stress, so as to delay the cracking process under in-phase, but positive mean stress overlapping the tensile alternative stress could accelerate the cycling cracking process under out-of-phase.

Keywords

oxide film cracking / in-phas / out-of-phase / cycling temperature / cycling loading / overlapping

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