Stacking Fault Energy in Relation to Hydrogen Environment Embrittlement of Metastable Austenitic Stainless CrNi-Steels

Metastable austenitic steels react to plastic deformation with a thermally and/or mechanically induced martensitic phase transformation. The transformation ?’-martensite can take place directly or indirectly via the intermediate stage of ?-martensite from single-phase austenite. This effect is influenced by stacking fault energy (SFE) steels. An SFE < 20 mJ/m2 known promote indirect conversion, while an > promotes direct conversion austenite into ?’-martensite. relationship has thus far not been considered in relation hydrogen environment embrittlement (HEE) metastable CrNi To gain new insights HEE under consideration and martensite formation steels, tensile tests were carried out this study at room temperature air gas atmosphere pressure p = 10 MPa. These conducted on conventionally produced alloy AISI 304L laboratory-scale modification alloy. In terms metal physics, differed value experimentally determined SFE. was 22.7 ± 0.8 304 mod 18.7 0.4 mJ/m2. specimens tested revealed ? ? ?’ for ? mod. From results it could be deduced that responsible significant increase content deformation-induced due reduction below atmosphere.