Abstract
Indentation of key microstructure factors affecting hydrogen embrittlement (HE) of duplex stainless steel (DSS) is fundamental for regulating the HE resistance. This study investigated H-assisted cracking of 2205 DSS with different microstructure based on the initiation and evolution of microcracks during deformation. Load and H repartitioning during straining were simulated and experimentally revealed. H-assisted microcrack initiation was frequently found at the austenite grain boundary owing to H-enhanced planar slip promoting the stress and H accumulation; whereas the ferrite phase acted as preferential crack propagation path. The narrower ferrite block and lower inter-connectivity between the ferrite blocks provided better HE resistance.
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