Abstract
Effects of strain amplitude on the isothermal fatigue (IF) and thermomechanical fatigue (TMF) behaviors of 316LN stainless steel were comparatively studied. The physical mechanisms for the evolution of cyclic stress response were revealed based on microstructure characterization. The manifestations of dynamic strain aging (DSA), dependence of DSA intensity on loading modes and influence of DSA on deformation properties were discussed. The dominated damage mechanism changed at the strain amplitude of about 0.27% at which the IF and TMF life curves intersected. The maximum stress was the appropriate damage parameter for life prediction with predicted life falling into the scatter band of 1.5.
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