Abstract The effect of dissolved hydrogen on the stress corrosion cracking initiation and short crack growth behaviour of Alloy 182 weld metal was evaluated in 274 °C hydrogenated high-purity water using accelerated crack initiation and growth tests with sharply notched fracture mechanics specimens and in-situ crack initiation and growth monitoring. A maximum in initiation susceptibility and crack growth rates was observed at the Ni/NiO phase transition line. Grain boundary misorientations and mismatch in Schmid factor were measured by electron backscattered diffraction along intergranular stress corrosion cracks and at crack initiation sites. Low-angle boundaries seem to be particularly resistant to cracking.

中文翻译：

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模拟沸水反应堆氢水化学条件下 182 合金焊缝金属的应力腐蚀开裂和短裂纹扩展行为

摘要 溶解氢对合金 182 焊缝金属的应力腐蚀开裂和短裂纹扩展行为的影响在 274 °C 氢化高纯水中使用加速裂纹萌生和扩展试验进行了评估，其中包括锐缺口断裂力学试样和原位裂纹扩展试验。裂纹萌生和扩展监测。在 Ni/NiO 相变线处观察到最大的引发敏感性和裂纹扩展速率。通过电子背散射衍射沿晶间应力腐蚀裂纹和裂纹萌生位置测量施密德因子中的晶界错误取​​向和失配。低角度边界似乎特别耐开裂。