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| Design, Processing and Properties of Cold Rolled TRIP Steel Bearing 1.20% Aluminum |
| Li Zhong-Yi |
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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
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Received: 16 March 2009
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2010, Vol. 45 
