Temperature dependence of tensile behavior of a high nitrogen Fe–Cr–Mn–Mo stainless steel

Temperature dependence of tensile behavior of a high nitrogen Fe–Cr–Mn–Mo stainless steel with nitrogen content of 0.66% was investigated. It was found that strength of the steel increased with decrease of temperature, and the deformation microstructure of the steel which determines the strain-hardening behavior was strongly dependent on temperature. It was analyzed that stacking fault energy (SFE) of the steel decreased with decrease of temperature, which promoted the twinning and planar slipping in the steel, and thus made brittle fracture to occur at cryogenic temperature.