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采用力学性能测试、光学显微镜、透射电镜等方法,研究了回火温度对TMCP高强钢组织和性能的影响。结果表明,经400~650℃回火后,钢板强度、冲击吸收能量和屈强比的变化规律明显不同。600℃回火时,屈服强度和抗拉强度达到最大值,冲击吸收能量则为最小值,且屈强比随着回火温度的升高而增加。回火后钢板组织以贝氏体为主,析出相为Nb、Ti复合析出,600℃时析出少量ε-Cu相,且随着回火温度升高,贝氏体板条逐渐合并,板条宽度增加,Nb、Ti复合析出相数量也随之增加。
The effects of tempering temperature on the microstructure and properties of TMCP high strength steel were studied by mechanical properties testing, optical microscope and transmission electron microscopy. The results show that after tempering at 400-650 ℃, the variation of strength, impact energy and yield ratio of steel plate are obviously different. At 600 ℃ tempering, the yield strength and tensile strength reached the maximum, the impact absorption energy is the minimum, and the yield ratio increases as the tempering temperature increases. After tempering, the microstructure of the steel sheet is mainly bainite. The precipitated phases are Nb and Ti, and a small amount of ε-Cu phase precipitates at 600 ℃. As the tempering temperature increases, the bainite slabs gradually merge and the lath As the width increases, the amount of Nb and Ti composite precipitates also increases.