Abstract The effects of cold rolling on the structure and stress corrosion cracking (SCC) susceptibility of twin boundaries in alloy 690 were studied. Most of the twin boundaries were transformed into random high angle boundaries (RHABs) following cold rolling. The transformed twin boundaries (TTBs) showed increased susceptibility to carbide precipitation during subsequent aging at 475 °C. The SCC initiation test in 360 °C hydrogenated water indicated that the prior RHABs exhibited increased SCC susceptibility after cold rolling. Moreover, TTBs become susceptible to SCC due to the promoted outward diffusion of Cr and can enhance the connectivity of susceptible grain boundaries.

中文翻译：

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模拟压水堆一次水环境下冷轧对690合金孪晶晶界结构和应力腐蚀开裂敏感性的影响

摘要 研究了冷轧对690合金孪晶界组织和应力腐蚀开裂敏感性的影响。大多数孪晶界在冷轧后转变为随机大角度晶界（RHAB）。在随后的 475 °C 时效过程中，转变的孪晶界 (TTB) 显示出对碳化物沉淀的敏感性增加。在 360 °C 氢化水中的 SCC 引发试验表明，先前的 RHAB 在冷轧后表现出增加的 SCC 敏感性。此外，由于促进了 Cr 的向外扩散，TTB 对 SCC 变得敏感，并且可以增强敏感晶界的连通性。