Abstract
Hydrogen entry has been reported to deteriorate tensile properties in ε transformation-induced plasticity (ε-TRIP) steels and twinning-induced plasticity (TWIP) steels. In particular, initiation and propagation of hydrogen-assisted cracks are observed at γ-austenite/ε-martensite interfaces, ε/ε intersections, twin boundaries and grain boundaries. We thus conducted tensile tests under hydrogen charging in various Fe-30Mn-(6-x)Si-xAl austenitic alloys to discuss surface crack initiation, propagation and arrest behavior. Tensile properties did not change by the hydrogen charging, although the number of surface cracks of the hydrogen-charged specimens increased. These results indicate that crack initiation was enhanced by hydrogen charging but the cracks were soon arrested, hence significant deterioration was not observed in the tensile properties of the present alloys.
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