Abstract

When austenitic stainless steels are subjected to a high stress, a martensitic phase transformation could be occurred in their microstructure. In order to investigate the effect of martensitic phase transformation on the stress field in a SUS316L, which is a kind of austenite stainless steels, finite element analysis was conducted using a polycrystalline model. The transformation was considered by changing crystal orientation and mechanical properties. In addition, the analysis of this model was conducted under a nominal strain to transform one grain into martensitic phase. As the result, the transformation decreases maximum stress near stress concentration in the model. Therefore, it indicates stress around the grain is relaxed. On the other hand, the stress around grains increase ±11% or less. It suggests that another stress concentration doesn't generate.

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