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Effect of Processing Route on Microstructure and Mechanical Properties in Single-Roll Angular-Rolling

机译：加工工艺对单辊角向轧制组织和力学性能的影响

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摘要

This paper reports the effect of the processing route on the microstructure and mechanical properties in the pure copper sheets processed by single-roll angular-rolling (SRAR). The SRAR process was repeated up to six passes in two processing routes, called routes A and C in equal-channel angular pressing. As the number of passes increased, the heterogeneous evolution of hardness and microstructural heterogeneities between the core and surface regions gradually became intensified in both processing routes. In particular, route A exhibited more prominent partial grain refinement and dislocation localization on the core region than route C. The finite element analysis revealed that the intense microstructural heterogeneities observed in route A were attributed to effective shear strain partitioning between the core and surface regions by the absence of redundant strain. On the other hand, route C induced reverse shearing and cancellation of shear strain over the entire thickness, leading to weak shear strain partitioning and delayed grain refinement. Ultimately, this work suggests that route A is the preferred option to manufacture reverse gradient structures in that the degree of shear strain partitioning and microstructural heterogeneity between the core and surface regions is more efficiently intensified with increasing the number of passes.
机译：本文报道了工艺路线对单辊角轧（SRAR）加工的纯铜板的显微组织和力学性能的影响。 SRAR过程在两条加工路径中重复进行了多达六遍，这两个加工路径在等通道角压中称为路径A和C。随着通过次数的增加，在两种加工路径中，核心和表面区域之间硬度和微观结构异质性的异质演变逐渐加剧。特别是，路线A在核心区域比路线C表现出更突出的局部晶粒细化和位错局限性。有限元分析显示，路线A观察到的强烈的微观结构异质性归因于核心和表面区域之间的有效剪切应变分配。没有多余的应变。另一方面，路线C引起反向剪切并在整个厚度上消除了剪切应变，从而导致剪切应变分配较弱并延迟了晶粒细化。最终，这项工作表明，路线A是制造反向梯度结构的首选方案，因为随着通过次数的增加，岩心和表面区域之间的剪切应变分配程度和微观结构异质性得到了更有效的增强。

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