Abstract
Thermomechanical fatigue (TMF) tests on the austenitic stainless steel AISI 304L have been conducted under “true≓ plastic-strain control in vacuum. This report considers the damage oc-curring during TMF loading. It is shown how the temperature interval and the phasing (in-phase, out-of-phase) determine the mechanical response and the lifetime of the specimens. If creep-fatigue interaction takes place during in-phase cycling, the damage occurs inside the ma-terial, leading to intergranular cracks which reduce the lifetime considerably. Out-of-phase cy-cling inhibits creep-induced damage, and no lifetime reduction occurs, even if the material is exposed periodically to temperatures in the creep regime. A formula is proposed which allows prediction of the failure mode, depending on whether creep-fatigue damage occurs or not. At a given strain rate, the formula is able to estimate the temperature of transition between pure fatigue and creep-fatigue damage.
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H.J.Christ formerly with the University of Erlangen.
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Zauter, R., Christ, H.J. & Mughrabi, H. Some aspects of thermomechanical fatigue of AISI 304L stainless steel: Part I. creep- fatigue damage. Metall Mater Trans A 25, 401–406 (1994). https://doi.org/10.1007/BF02647985
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DOI: https://doi.org/10.1007/BF02647985