Investigation of Retained Austenite and Its Stability in Hot Rolled TRIP Steel

By means of X-ray diffraction(XRD),transmission electron microscopy(TEM) and tensile test,retained austenite and its carbon content and stability of hot rolled transformation-induced plasticity(TRIP) steels which were prepared through three processes was investigated.Result reveals that bainitic zone residence time has greater impact on the amount of retained austenite,the experimental steel obtained the maximum amount of retained austenite when it was coiled in the bainitic zone;the carbon content in retained austenite of the final organization will increase with the relaxation time extension;Carbon content in retained austenite,as well as retained austenite grain size,the shape and phase around retained austenite all exert an influence on stability of the retained austenite.