Abstract
In-phase (IP) and out-of-phase (OP) thermomechanical fatigue (TMF) properties of SS304 stainless steel were evaluated in the temperature range of 300–600 °C. All tests were strain controlled and the strain rate was kept constant. Material exhibited cyclic hardening followed by saturation of cyclic stress. Fatigue life reduced in OP testing compared to IP testing as the strain amplitude increased. Specimens failed with multiple cracks on the surface in OP testing whereas a single crack had predominantly grown inward and weakened the section in IP testing. Nanoindentation studies showed higher hardness around the crack tip compared to the uncracked regions. TEM showed a well developed dislocation cell structure in OP TMF while IP specimens showed planar slip bands with pile up of dislocations.
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