Abstract
This study investigates the ductility loss of a hydrogen-charged 2205 duplex stainless steel at various test temperatures. The initiation and propagation of hydrogen-induced microcracks during tensile straining are statistically characterized to get a glimpse of the interactions between hydrogen and the dual-phase microstructure. The hydrogen contents and distribution are also analyzed. Thermodynamic models are utilized to determine the stacking fault energy of the austenite phase. The results show that the steel's hydrogen embrittlement (HE) susceptibility and the thickness of the hydrogen-induced brittle layer decreased with increasing temperature. Hydrogen desorption during straining was significantly accelerated when the test temperature was 42 °C. By comparing the observed deformation microstructure with the calculated stacking fault energies, we conclude that the stacking fault energy of the austenite strongly depends on hydrogen concentration rather than environmental temperature. The high HE susceptibility of the specimens tested at 22 and 32 °C resulted from the combined effects of hydrogen-enhanced planar slip and the early formation of hydrogen-induced microcracks.
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