Abstract
The effects of hydrogen on the ductility loss and fracture behavior of a nitrogen-doped duplex stainless steel were investigated via tensile testing after electrochemical hydrogen pre-charging. Post-mortem microstructure analyses were performed to characterize the microstructural damage evolution and fracture surface. Hydrogen charging of the steel resulted in quasi-cleavage and intergranular fractures, which were associated with transgranular austenite cracking and ferrite/austenite interface cracking, respectively. The crucial factors that resulted in brittle-like cracking were deformation twinning in austenite and nitrogen-related solution hardening.
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