Abstract
Abstract The environmental effect on the mechanical properties of steels, specifically hydrogen embrittlement (HE), has been widely investigated and is one of the major factors responsible for in-service material failure. Testing methods like slow strain rate testing (SSRT) of tensile specimens have been used but the results are qualitative. This study aims at evaluating the effects of hydrogen on fracture toughness of a duplex stainless steel (UNS S31803). The effect of hydrogen on the J-integral and crack tip opening displacement (CTOD) was studied in this investigation. CTOD is a geometric measurement used to calculate the fracture toughness. Cathodically precharged specimens have been tested according to the ASTM E1820. It was seen that this standard fails to identify the initiation J-integral for these tough materials. Stretch zone width (SZW) was estimated from fractographs to estimate the initiation toughness. Results indicate that hydrogen pickup adversely affect the initiation toughness as well a...
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