材料期刊网

本文报道了含1.2%Al-0.1%C-Mn-Si 冷轧TRIP600钢带的研究开发结果，通过合金设计、冶炼、热轧、冷轧和热处理在实验室成功地制备了TRIP600钢带，其屈服强度为390～420MPa、抗拉强度650～700MPa，伸长率30.5～37.5%，强塑积约 21000~26000 MPa%。作为热处理工艺设计的基础，作者通过Thermo-Calc软件计算了实验钢的相图、相组成、贝氏体转变TTT曲线和T0温度线。应用彩色金相、SEM、EBSD和X-射线衍射技术检测实验钢的显微组织、残余奥氏体的体积分数、分布和碳含量。研究结果表明含1.20%铝的冷轧TRIP600的成分设计和工艺参数合理，可以作为工业试生产TRIP600的基础。分析表明，热轧板的带状组织和表面层脱碳与氧化是影响实验TRIP钢性能进一步提高的重要原因。

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