Abstract
The crystallographic and fractographic aspects of stage I corrosion fatigue of SS 316L have been studied with the aid of etch pitting techniques. Single edge notch specimens were fatigued at 123 Hz in desiccated air and near neutral (pH 5.5) aqueous environments of 1 M NaCl and 1 M NaCl + 0.01 M Na2S2O3. The fractographic features were found to be independent of the testing conditions. The orientation of primary facets and the crystallographic directions of crack propagation were identified. Six combinations of crack plane and direction were observed with primary facet orientations of {111}, {110}, and {001}. The primary facet crystallography was shown to arise from microscale propagation along a single variant of {111} or alternating periods of microscale propagation along a conjugate pair of {111} variants. The mechanism of cracking was discussed and shown to be consistent with a model of restricted slip reversibility (RSR), where environmental interactions with emergent slip steps influence the amount of slip reversibility.
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