Hydrogen induced cracking behaviour of O&G nickel alloy 625+ (UNS N07716) was investigated. Deuterium was introduced electrochemically into samples by cathodic polarisation (3.5 wt.% NaCl.D₂O) under different mechanical conditions. Subsequently, deuterium distributions were mapped using NanoSIMS. Deuterium was used as an isotopic tracer instead of hydrogen to avoid the detection of hydrogen artefacts. Complimentary image analysis using scanning electron microscopy (SEM) and low voltage energy dispersive X-ray (EDX) allowed the identification of microstructural features corresponding to deuterium enrichments. The results provided experimental evidence of enrichments at dislocation slip bands (DSB), twin boundary and grain boundary features that include σ precipitates.

研究了氢对O＆G镍合金625+（UNS N07716）的开裂行为。在不同的机械条件下，通过阴极极化（3.5 wt。％NaCl.D ₂ O）将氘电化学引入样品中。随后，使用NanoSIMS绘制氘分布图。氘用作氢的同位素示踪剂，以避免检测到氢伪像。使用扫描电子显微镜（SEM）和低压能量色散X射线（EDX）进行的免费图像分析可以识别与氘富集相对应的微观结构特征。该结果提供了位错滑移带（DSB），孪晶边界和包括σ沉淀物的晶界特征的富集的实验证据。