Influence of texture on the short fatigue crack growth in austenitic stainless steel
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We study the influence of texture on the propagation of short cracks on the basis of the evolution of a family of microcracks in 316L austenitic stainless steel under the conditions of symmetric tension-compression. It is shown that the process of crack initiation is concentrated on grain boundaries and strongly depends on the mesostructure. In the process of fatigue fracture, the transcrystalline propagation of the largest crack (affected mainly by the global texture) is predominant. We discuss two approaches to the prediction of the influence of texture on the fatigue life. According to the concept of equivalent crack, this influence can be estimated depending on the size of the largest crack. On the contrary, the Zhurkov criterion deals with the state of the defect characterized by the presence of a family of microcracks.
KeywordsFatigue Fatigue Life Crack Length Crack Growth Rate Austenitic Stainless Steel
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