Abstract
The cracking behavior of 2205 duplex stainless steels in 26 wt% NaCl of pH 2 under cathodic polarization condition was investigated. Dramatic reductions in ultimate tensile strength and ductility were found, indicating its susceptibility to hydrogen-assisted fracture at an applied potential of −1500 mV (SCE). The effect of hydrogen-assisted cracking became more pronounced as the stain rate decreased, and/or as the precharging time increased. Microstructural examination showed that surface crack could initiate either in austenite phase or in ferrite phase. Under cathodic charging condition internal cracks, resulted from hydrogen embrittlement of ferrite phase, could be arrested by austenite.
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