Microstructure, deformation mechanisms and influence of hydrogen on tensile properties of the Co based super alloy DIN 2.4711/UNS N30003

The Co-based alloy 2.4711 investigated in this study consists of an austenitic martix with ε-martensite from both strain hardening and aging. Upon deformation, the microstructure shows strain-induced γ→ε transformation. Mechanical twinning could not be verified in this study using EBSD.Tensile testing in hydrogen gas and with H-precharged specimens revealed negligible embrittlement for the specimens tested in H2 gas, whereas severe …