Abstract This study investigated the grain size effect on the resistance to hydrogen embrittlement (HE) of API 2W Grade 60 steels using in situ slow-strain-rate testing. Hydrogen was electrochemically charged into specimens and the hydrogen content evolved from diffusible hydrogen-trap sites was measured by thermal desorption spectrometry (TDS). The fine-grained (14 μm) steel showed superior HE resistance despite exhibiting higher total hydrogen content than the coarse-grained (35 μm) steel. Decreasing grain size resulted in a larger grain boundary area, thereby better reducing the normalized amount of diffusible hydrogen trapped per unit length of grain boundary.

中文翻译：

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使用原位慢应变速率测试，晶粒尺寸对 API 2W 60 级钢的抗氢脆性的影响

摘要 本研究使用原位慢应变速率试验研究了晶粒尺寸对 API 2W 60 级钢的抗氢脆 (HE) 性能的影响。氢气被电化学充电到样品中，从扩散性氢捕集点释放的氢含量通过热解吸光谱法 (TDS) 测量。尽管总氢含量高于粗晶 (35 μm) 钢，但细晶 (14 μm) 钢仍显示出优异的抗 HE 性能。减小晶粒尺寸导致更大的晶界面积，从而更好地降低每单位晶界长度捕获的扩散氢的归一化量。