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对传统淬火-配分钢(Q&P钢)添加合金元素Ni和Nb,并对实验钢采用两相区Q&P工艺处理,得到了一种超细晶Q&P钢,分析了实验钢的显微组织和力学性能。结果表明,该种成分钢得到了块状铁素体+块状马氏体+残留奥氏体的混合组织,且晶粒达到了亚微米级别。由于残留奥氏体的相变诱发塑性(TRIP)效应,使得实验钢获得了兼具强度和塑性的优异力学性能。在退火温度为690℃时,实验钢抗拉强度达到1195 MPa,断后伸长率为23.5%,强塑积达到28 GPa·%。
Addition of alloying elements Ni and Nb to the traditional quenched and hardened steel (Q & P steel), and the Q & P process of the experimental steel by the two-phase method, an ultrafine-grained Q & P steel was obtained and the microstructure and mechanical properties of the experimental steel were analyzed . The results show that this kind of steel has got the mixed structure of massive ferrite + massive martensite + retained austenite, and the grains reach submicron level. Due to the phase change induced plasticity (TRIP) effect of retained austenite, the experimental steel achieves excellent mechanical properties that combine strength and plasticity. When the annealing temperature is 690 ℃, the tensile strength of the experimental steel reaches 1195 MPa, the elongation at break is 23.5% and the strong plastic product reaches 28 GPa ·%.