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通过模拟实验研究了钛微合金化热轧双相钢的连续冷却转变曲线及终轧温度对组织的影响规律,获得了可行的工艺窗口,并进行了验证性热轧实验.在冷却速率小于5℃·s-1及温度在625~725℃时,实验钢可以形成先共析铁素体.随着终轧温度升高,组织中铁素体及马氏体含量先升高后降低,但幅度不大.同时,当终轧温度较高时,铁素体显微硬度增加,析出强化作用增加.当终轧温度及缓冷温度分别为840℃及700℃时,获得了抗拉强度为672 MPa及屈强比为0.61的性能良好的热轧双相钢.经计算,铁素体组织中析出强化量为78.5 MPa.
The effects of continuous cooling transformation curve and finishing temperature on microstructure of Ti microalloyed hot-rolled dual-phase steel were studied by simulation experiments, and a feasible process window was obtained and a confirmatory hot-rolling experiment was carried out.When the cooling rate is less than 5 ℃ · s-1 and the temperature from 625 ℃ to 725 ℃, the pro-eutectoid ferrite can be formed in the experimental steel.When the finishing temperature increases, the ferrite and martensite contents first increase and then decrease, but the amplitude While when the finishing temperature is higher, the ferrite microhardness increases and the precipitation strengthening effect increases.When the finishing temperature and slow cooling temperature are 840 ℃ and 700 ℃ respectively, the tensile strength is 672 MPa and a good hot rolled dual phase steel with a yield ratio of 0.61.The amount of precipitation strengthening in the ferrite microstructure was calculated to be 78.5 MPa.