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Shear deformation behavior of Zircaloy-4 alloy plate
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2020-01-03 , DOI: 10.1016/j.msea.2020.138914
Fusen Yuan , Geping Li , Fuzhou Han , Yingdong Zhang , Ali Muhammad , Wenbin Guo , Hengfei Gu

Zircaloy-4 alloy is widely used in light water reactors. During cold rolling, this alloy is prone to cracking under shear stress. The microstructural characteristics after shear deformation have been investigated in this study in order to provide technical support for avoiding failure of this alloy. Shear tests for recrystallized Zircaloy-4 alloy plate were performed at room temperature using a designed shear testing device. Shear fracture surface and microstructure were carefully characterized by scanning electron microscope (SEM) and electron backscatter diffraction (EBSD) techniques, respectively. Results showed that grains in the initial plate are strongly oriented with their c-axis close to the transverse direction (TD). Shear fracture surface can be simply divided into two typical zones based on the morphology features: (I) smooth zone and (II) rough zone. The plate exhibited anisotropy of shear yield strength in the order given as: Normal direction (ND)<Rolling direction (RD)<TD < 45° away from TD (TD45°), which was associated to the initial texture based on the Schmid factor theory. The fracture shear strain increased with the increase area of zone (I). Prismatic <a> slip and {101¯2}<1¯011> tensile twinning were the predominant deformation modes during the shear deformation. In addition, {101¯2}<1¯011> tensile twinning activity was high in grains oriented with their c-axis perpendicular to the shear stress direction (SSD). Furthermore, work hardening occurred due to slip and twinning in the shear deformation region (SDR), which substantially increased the microhardness of the SDR (198 HV) as compared to that of matrix (157 HV). Shear failure tended to occur on the RD-TD45° plane with external load.



中文翻译:

Zircaloy-4合金板的剪切变形行为

Zircaloy-4合金广泛用于轻水反应堆中。在冷轧过程中,该合金在剪切应力下易于开裂。本研究对剪切变形后的显微组织特性进行了研究,以期为避免这种合金的破坏提供技术支持。使用设计的剪切测试设备在室温下对重结晶的Zircaloy-4合金板进行了剪切测试。分别通过扫描电子显微镜(SEM)和电子背散射衍射(EBSD)技术仔细表征了剪切断裂表面和微观结构。结果表明,初始板中的晶粒具有强烈的取向,其c轴靠近横向方向(TD)。根据形态特征,可以将剪切断面简单地分为两个典型区域:(I)平滑区和(II)粗糙区。板按以下顺序显示出剪切屈服强度的各向异性:法线方向(ND)<滚动方向(RD)<TD <距TD(TD45°)<45°,这与基于Schmid因子的初始织构有关理论。断裂剪切应变随区域(I)的增加而增加。棱柱形<a>滑移和{101个¯2}<1个¯011>拉伸孪生是剪切变形过程中的主要变形模式。此外,{101个¯2}<1个¯011>c轴垂直于剪切应力方向(SSD)取向的晶粒具有较高的拉伸孪生活性。此外,由于在剪切变形区域(SDR)发生打滑和孪生,加工硬化发生,与基体(157 HV)相比,SDR的显微硬度(198 HV)大大提高。带有外部载荷的RD-TD45°平面上往往会发生剪切破坏。

更新日期:2020-01-04
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