Micromechanical analysis of residual stress around coarse precipitates under cold rolling conditions
Micromechanical analysis of residual stress around coarse precipitates under cold rolling conditions
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DOI：
10.1016/j.mechmat.2021.103841
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发表时间：
2021-03-31
影响因子：
3.9
通讯作者：
Muraishi, Shinji
中科院分区：
文献类型：
--
作者：
Park, Sung-Jin;Muraishi, Shinji
具有高取向梯度的细等轴晶粒的特征显微组织经常在冷轧试样中的粗析出物周围发现;这些显微组织被认为是冷轧和随后的热处理下的再结晶形核位点。为了预测所施加的应变和沉淀物形状对沉淀物附近的应变和应力扰动的影响，冷轧条件下的不均匀性问题已经解决了分析使用内部和外部点Eshelby张量。据发现，周围的沉淀物的应力和应变扰动变化很大的沉淀物的纵横比，其中的应力局部化的区域是依赖于沉淀物的两端平行于轧制方向的沉淀物的曲率。残余应力的预测强烈建议，形成一个旋转区是由于在冷轧扰动应力松弛。
Characteristic microstructures of fine equiaxial grains with highly oriented gradients are often found around coarse precipitates in cold-rolled specimens; these microstructures are regarded as recrystallization nucleation sites under cold rolling and subsequent heat treatment. To predict the influence of applied strain and precipitate shape on strain and stress disturbances near a precipitate, the inhomogeneity problem under cold rolling conditions has been solved analytically using interior- and exterior-point Eshelby tensors. It is found that the stress and strain disturbances around the precipitate vary substantially with the aspect ratio of the precipitate, where the region of stress localization is dependent on the precipitate curvature at both ends of the precipitate parallel to the rolling direction. The residual stress predictions strongly suggest that the formation of a rotated zone is caused by the relaxation of disturbed stress under cold rolling.