Abstract：The present work is focused on the development of TRIP-600 steels containing 1.2%Al on a laboratory scale. The phase diagrams, TTT curves and T0 lines of bainite formation in the steels were calculated with Thermo-Calc. The TRIP600 strips were successfully prepared through a designed process including steel-making, hot and cold rolling as well as heat treatments. Tensile strength 650~700MPa, yield strength 390~420MPa and total elongation 30.5~37.5% is obtained for the steel strips. Microstructure especially the fraction and carbon content of the retained austenite in the experimental steels was investigated by using color metallography, SEM, EBSD and X-ray diffraction techniques. The investigation shows that the chemical compositions and processing parameters optimized in the experiment can be referred for trial-manufacture of TRIP 600 steels. Decarbonization in the surface layer and band structure of strips is important factor which interferes with improving of the TRIP steels in mechanical properties
2010, Vol. 45 
