One of the most intriguing methods of mitigating the hydrogen embrittlement of steels entails nanoprecipitates that can trap H from enriching at vulnerable locations. However, controversial findings have been reported on whether the incoherent NbC precipitates trap hydrogen. Here, by using in-situ scanning Kelvin probe force microscopy (SKPFM), we reveal the dynamic interaction of H with the border area of incoherent NbC nanoprecipitates in steel. Results indicate that the interaction between H flux and the interfaces varies amongst different precipitates, implying that H-trapping behaviours of incoherent NbC precipitates could be intrinsically diverse. Potential origins underlying the distinct behaviours are analyzed.

中文翻译：

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原位扫描开尔文探针力显微镜研究非相干 NbC 纳米沉淀物周围的多种氢捕获行为


减轻钢氢脆的最有趣的方法之一是使用纳米沉淀物，它可以阻止氢气在脆弱位置富集。然而，关于非相干 NbC 沉淀是否会捕获氢，存在争议。在这里，通过使用原位扫描开尔文探针力显微镜（SKPFM），我们揭示了 H 与钢中不相干 NbC 纳米沉淀物边界区域的动态相互作用。结果表明，不同沉淀物之间的 H 通量和界面之间的相互作用有所不同，这意味着非共格 NbC 沉淀物的 H 捕获行为本质上可能是不同的。分析了不同行为背后的潜在根源。