热处理工艺对Q&P钢组织及力学性能的影响

Effect of heat treatment on microstructure and mechanical properties of Q&P steel

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-manganese Q＆P steel was developed. A continuous annealing simulator was used to simulate the heat treatment of the Q＆P steel and the mechanical properties were tested and the microstructure was analyzed. The results indicate that the microstructure consists of lath martensite and retained anstenite. The strength and elongation increase first and then decrease with the increase of the quenching stop temperature. When the quenching stop temperature is 210 ℃, the mechanical properties are preferable with tensile strength of 1630 MPa, and elongation of 17.04%. The tensile strength decreases and the elongation increases with the increase of partitioning time. The strength decreases about 57 MPa and the elongation increases 2.98% when partition time increased from 10 s to 120 s at 400 ℃.