Abstract
The resistance of dissimilar joints to hydrogen was assessed using fracture toughness in an aggressive environment and slow strain rate tests. Six weld joint conditions were evaluated. To determine the distribution of microconstituents and elements along the interfaces, techniques such as optical and scanning electron microscopy, tomography, and nano hardness were employed. The results demonstrated that the susceptibility to hydrogen embrittlement is directly linked to the fraction of discontinuous regions present along the dissimilar interface. Additionally, a critical evaluation of the methodology concerning the positioning of stress concentration at the dissimilar interface was carried out, and alternative approaches were presented.
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