Hydrogen embrittlement remains a strong obstacle to the durability of high-strength structural materials, compromising their performance and longevity in critical engineering applications. Of particular relevance is the effect of mobile and trapped hydrogen at interfaces, such as grain and phase boundaries, since they often determine the material’s performance and can be embrittled by hydrogen enhanced decohesion (HEDE). This study focuses on dual-phase (DP) steels, where ferrite-martensite interfaces play a crucial role in hydrogen embrittlement. Hydrogen absorption triggers complex interactions at these interfaces on the nano- and micro-scale; however, existing studies, especially those addressing the behavior of both mobile and trapped hydrogen, have yielded inconclusive outcomes.
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