Abstract Fatigue crack growth experiments have been performed on high and low sulphur Type 316 austenitic stainless steel specimens in simulated Pressurised Water Reactor primary coolant environments and evaluated via microstructural characterisation techniques to further the understanding of the mechanistic behaviour. At relatively high loading frequencies, the enhanced crack growth for both specimens appeared to be crystallographic and associated with slip localization. However, when the loading frequency was decreased, the crack growth rates for the low S specimen increased, whereas the high S specimen exhibited retarded crack growth and the crack path was no longer crystallographic.

中文翻译：

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在压水堆原水中测试的 316 型奥氏体不锈钢的腐蚀疲劳和微观结构表征

摘要 在模拟压水反应堆主冷却剂环境中对高硫和低硫 316 型奥氏体不锈钢试样进行了疲劳裂纹扩展实验，并通过微观结构表征技术进行了评估，以进一步了解机械行为。在相对较高的加载频率下，两个试样的裂纹扩展增强似乎是晶体学的，并且与滑移定位有关。然而，当加载频率降低时，低 S 试样的裂纹扩展速率增加，而高 S 试样的裂纹扩展延迟，裂纹路径不再是晶体。