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Effect of grain orientation on stress state near twin grain boundary of austenitic stainless steel

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Document pages: 10 pages

Abstract: The stress state at the crack tip of nuclear power plant structural components used in SCC quantitative prediction model is based on the assumption that polycrystalline materials are isotropic and uniform at present. However, the crystals in polycrystalline materials have anisotropy with different orientations, which will lead to uneven stress, resulting in the occurrence and expansion of stress corrosion. The elastic response of dual crystal anisotropic behavior of austenitic stainless steel was studied by finite element method. The results show that the stress distribution near GBS strongly depends on the crystal orientation. With the increase of load direction stiffness, there is a large Mises stress concentration on GB. Mises stress difference is higher in the following cases:icrystal with bigger elastic modulus difference of two neighboring grains along the tensile axis. In the bicrystal with GB perpendicular to the tensile axis, the grain orientation has little effects on the Mises stress far from the GB in both grains. The strain inconsistency in bicrystals is affected by the mismatch of two neighboring grains. The larger the elastic modulus differences between two neighboring grains caused by misorientation, the larger the strain inconsistency in the bicrystal.

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