低碳马氏体钢的细晶强化机理及其力学性能

Fine-Grain Strengthening Mechanism of Low-Carbon Martensite Steel and Its Mechanical Properties

对不同热处理条件下获得的低碳马氏体钢的微观组织及力学性能进行了系统的研究.实验结果表明,盐浴淬火热处理可以实现样品的快速、均匀加热,与常规的热处理条件相比,由于加热速度快、保温时间短,在材料完全奥氏体化初期或接近完全奥氏体化情况下,奥氏体晶粒还未长大,通过淬火得到较为细小的马氏体组织,可以获得力学性能优良的马氏体钢.通过优化的热处理参数可以将材料的抗拉强度和延伸率均提高10%以上.其中盐浴淬火在930℃×20 s工艺下,抗拉强度达到1.488 GPa,延伸率为7.6%.

Microstmcture and mechanical properties different heat treatment conditions were studied. The of low-carbon martensite steel obtained by results showed that the salt bath quenching heat treatment can achieve rapid and uniform heating. Compared to conventional heat treatment conditions, the austenite grain size has not grown up at the early stages of fully austenitic or nearly fully austenitic due to the fast heating speed and short heat preservation time, so the fine martensite microstructure was obtained by quenching and the martensite steel has excellent mechanical properties simultaneously. Through the heat treatment parameters optimization, the tensile strength and elongation increase more than 10%. tinder the 930 ℃ x 20 s salt bath quenching, the martensite steel＇ s tensile strength is I. 488 GPa and the elongation is 7.6%.