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

• Published in: Journal of Wuhan University of Technology. Materials science edition Vol. 23; no. 6; pp. 850 - 853
• Main Author: He, Qingfu
• Format: Journal Article
• Language: English
• Published: Heidelberg Wuhan University of Technology 01.12.2008; Springer Nature B.V; Department of Mechanical Engineering,Beijing Jiaotong University,Beijing 100044,China
• Subjects: Alloys; Chemistry and Materials Science; Fatigue; Materials Science; Metallurgy; cycling temperature; cycling loading; out-of-phase; in-phas; oxide film cracking; overlapping
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/s11595-007-6850-z

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.