Fatigue Crack Thresholds Significantly Affected by Thermo-Mechanical Loading Histories in an Austenitic and a Ferritic Low Alloy Steel

Abstract:

High cycle thermal fatigue failure of pipes induced by fluid temperature change is one of interdisciplinary issues to be concerned for long term structural reliability of high temperature structural material and components in energy systems. In order to get basic understanding on this article. the fatigue crack propagation tests were carried out in a low alloy steel and an austenitic stainless steel those were subjected to typical kinds of thermo-mechanical loading histories those included a simulated weld repair process. It was shown experimentally that the thermo-mechanical histories left their individual effects along the prior fatigue crack wake, resulting in significant change in the fatigue crack threshold. Some proposes are presented to predict those history effects.

• Periodical: Advanced Materials Research (Volumes 891-892)
• Pages: 1295-1301
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.891-892.1295
• Online since: March 2014
• Authors: Masakazu Okazaki, M. Muzvidziwa, R. Iwasaki, Naoto Kasahara
• Keywords: Crack Wake, Fatigue Threshold, High Cycle Thermal Fatigue Failure, High-Cycle, Low-Cycle Fatigue Interaction, Thermo-Mechanical Loading History, Welding Repair

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