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对一种中碳中锰Q&P钢进行了研究,利用连退模拟试验机进行了热处理试验,测试了力学性能,观察了微观组织。试验结果表明,试验钢室温下组织为板条马氏体与残留奥氏体;随淬火冷却终止温度的提高,抗拉强度及伸长率均呈现先增加后降低的趋势,淬火冷却终止温度为210℃时,抗拉强度为1630 MPa,伸长率达到17.04%,具有最优力学性能;随配分温度升高,抗拉强度呈现下降趋势,而伸长率逐渐增大;配分温度为400℃,配分时间由10 s延长到120 s后,抗拉强度降低了57 MPa,而伸长率提高了2.98%。
A medium carbon medium manganese steel, Q & P, was studied. The heat treatment test was carried out by using a continuous annealing simulator. The mechanical properties were tested and the microstructure was observed. The results show that the microstructure of the test steel is lath martensite and retained austenite at room temperature. With the increase of quench cooling temperature, the tensile strength and elongation of the test steel first increase and then decrease, the quench cooling termination temperature is At 210 ℃, the tensile strength is 1630 MPa and the elongation is 17.04%, which has the best mechanical properties. With the increase of the component temperature, the tensile strength shows a downward trend and the elongation increases gradually. The temperature is 400 ℃ , The time of the partitioning was extended from 10 s to 120 s, the tensile strength decreased by 57 MPa and the elongation increased by 2.98%.