Crystal Plasticity Analysis of the Relation between Micro‐Texture and Surface Ridging for a 21%Cr Ferritic Stainless Steel,Steel Research International

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Crystal Plasticity Analysis of the Relation between Micro‐Texture and Surface Ridging for a 21%Cr Ferritic Stainless Steel
Steel Research International ( IF 1.9 ) Pub Date : 2020-06-30 , DOI: 10.1002/srin.202000109
Chi Zhang _{1,

2} , Yujie Xu ₁ , Liwen Zhang ₁ , Xiaoguang Zhou ₂

Affiliation

The micro‐texture of ferritic stainless steel generated by rolling and annealing processes is supposed to behave plastic anisotropy and heterogeneous strain response during forming, especially for the high Cr content ferritic stainless steel with single ferrite phase. The relation between crystallographic orientations and their strain responses during loading are analyzed for a 21% Cr ferritic stainless steel sheet. The crystallographic orientation distributions in surface and center layers as well as in cross section are characterized by an electron backscatter diffraction (EBSD) method. It indicates that texture gradients along thickness with center layer having a higher density of <111>//ND texture are formed. Some grain clusters with similar oriented grains gathering together to be parallel to the rolling direction are observed. Then, the experimental orientation distributions are condensed and incorporated into a developed crystal plasticity finite‐element model (CPFEM), in which the multiple slip systems and the interaction between neighbor grains are considered. The simulation results confirm that the heterogeneous distributions of normal strain and shear strain preserved for the different crystal orientation grains result in the surface ridging. The texture gradients can help to decrease the tendency of surface ridging. The simulation results show a reasonable agreement with the tensile test results.

中文翻译：

21％Cr铁素体不锈钢微观组织与表面起皱之间关系的晶体塑性分析

轧制和退火过程产生的铁素体不锈钢的微观组织被认为在成形过程中表现出塑性各向异性和非均匀应变响应，特别是对于具有单铁素体相的高Cr含量铁素体不锈钢。分析了21％Cr铁素体不锈钢薄板在加载过程中晶体取向与应变响应之间的关系。表面和中心层以及横截面中的晶体取向分布通过电子背散射衍射（EBSD）方法表征。这表明在中心层具有更高密度的<111> // ND纹理的情况下，沿着厚度形成了纹理梯度。观察到一些取向相似的晶粒簇聚在一起，平行于轧制方向。然后，压缩实验取向分布并将其合并到已开发的晶体可塑性有限元模型（CPFEM）中，该模型考虑了多个滑移系统和相邻晶粒之间的相互作用。仿真结果证实了不同晶体取向晶粒所保留的正应变和剪应变的不均匀分布会导致表面起皱。纹理梯度可以帮助减少表面起皱的趋势。仿真结果与拉伸试验结果显示出合理的一致性。仿真结果证实了不同晶体取向晶粒所保留的正应变和剪应变的不均匀分布会导致表面起皱。纹理梯度可以帮助减少表面起皱的趋势。仿真结果与拉伸试验结果显示出合理的一致性。仿真结果证实了不同晶体取向晶粒所保留的正应变和剪应变的不均匀分布会导致表面起皱。纹理梯度可以帮助减少表面起皱的趋势。仿真结果与拉伸试验结果显示出合理的一致性。

更新日期：2020-06-30

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