Warm tensile properties of low-alloy TRIP steel warm-rolled just prior to isothermal holding treatment

Abstract. Low-alloy TRIP steel sheets with ultra-high-strength that utilize transformation-induced plasticity of retained austenite have high strength and ductility. In this study, low-alloy thermo-mechanical treatment warm rolling were prepared, the effects on tensile properties investigated. A hot-rolled sheet Ms 418.5°C was austenized then quenched in a salt bath kept at 450°C. Two specimens warm-rolled by 40 60% isothermally held 350℃ for 1ks. For comparison, specimen directly heat-treated 350°C The three subjected to microstructural characterizations tests temperatures ranging from 25 300°C. It confirmed increases ductility/strength balance. X-ray diffraction showed causes an increase volume fraction austenite, while its stability against deformation somewhat complicated. effect temperature reduction uniform elongation, which is parameter mostly affected TRIP, successfully understood terms austenite.