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首页> 外文会议>12th International Conference on Environmental Degradation of Materials in Nuclear Power Systems: Water Reactors 2005 vol.2 >THE EFFECT OF GRAIN ORIENTATION ON THE CRACKING BEHAVIOR OF ALLOY 182 IN PWR ENVIRONMENT
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THE EFFECT OF GRAIN ORIENTATION ON THE CRACKING BEHAVIOR OF ALLOY 182 IN PWR ENVIRONMENT

机译：压堆取向对压水堆环境中182合金开裂行为的影响

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The objective of this work was to determine whether grain orientation influences the cracking behavior of Alloy 182 weldments. The study involved two laboratory-prepared welds, a double-J weld and a deep-groove-filled weld. The characters of the grain boundaries and grain orientations were examined by orientation imaging microscopy (OIM). The microstructures of the two weld alloys are similar, with high proportions (70%) of cracking-susceptible high-angle boundaries (HABs). In addition, the OIM maps show the presence of clusters of grains that share similar orientations. It is hypothesized that a boundary with a weak Taylor-factor mismatch, as would be the case of two neighboring grains that share a similar orientation, would be less susceptible to deformation, and ultimately to cracking. By contrast, a strong mismatch in Taylor factor across a grain boundary suggests that a strain incompatibility would exist at that boundary, thus making it susceptible to cracking. To test the hypothesis, OIM maps were obtained along the crack paths in two Alloy 182 compact tension specimens tested in a simulated PWR environment. A comparison of scanning electron microscopy photomicrographs of the cracks with the OIM maps of the same areas enabled the identification of the types of cracked grain boundaries, as well as the relative orientation of the neighboring grains. The results show that, on average, 90% of the cracked boundaries are HAB and 87% of the cracks occurred more readily along grain boundaries that separate dissimilarly oriented grains.
机译：这项工作的目的是确定晶粒取向是否影响182合金焊件的开裂行为。该研究涉及两个实验室准备的焊缝，双J焊缝和深槽填充焊缝。通过取向成像显微镜（OIM）检查了晶界和晶粒取向的特征。两种焊接合金的微观结构相似，具有高比例（70％）的易开裂高角度边界（HAB）。此外，OIM贴图显示了存在相似取向的晶粒簇的存在。假设具有弱泰勒因子失配的边界（例如两个相邻晶粒共享相似方向）会更不易变形，最终不易破裂。相反，横跨晶界的泰勒因数严重不匹配，表明该边界处将存在应变不兼容，从而使其易于破裂。为了验证该假设，在模拟的PWR环境中测试的两个Alloy 182紧凑拉伸试样中，沿着裂纹路径获得了OIM图。将裂纹的扫描电子显微镜显微照片与相同区域的OIM图进行比较，可以识别裂纹晶界的类型以及相邻晶粒的相对方向。结果表明，平均而言，90％的裂纹边界是HAB，而87％的裂纹更容易沿着将不同取向晶粒分开的晶界发生。

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