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在实验室试制了1000 MPa级连续退火双相钢,利用光学显微镜、SEM、TEM以及拉伸试验对双相钢的微观组织和力学性能进行检测。结果表明,保温温度830℃,保温时间60 s,快冷至过时效温度240℃,过时效时间240 s,可以得到屈服强度535 MPa、抗拉强度1145 MPa、屈强比0.47、伸长率13%,具有较好综合性能的高强双相钢;抗拉强度随过时效温度的升高呈下降趋势,屈服强度、伸长率和屈强比呈上升趋势,在过时效温度为360℃时,出现屈服平台。
The 1000 MPa continuous annealed duplex steel was prepared in the laboratory. The microstructure and mechanical properties of the duplex steel were examined by optical microscope, SEM, TEM and tensile test. The results show that the yield strength is 535 MPa, the tensile strength is 1145 MPa, the yield ratio is 0.47 and the elongation is 13% when the holding temperature is 830 ℃, holding time is 60 s, cooling to over aging 240 ℃ and over aging 240 s %, With good overall performance of high-strength dual-phase steel; tensile strength decreases with the rise of over-aging temperature, yield strength, elongation and yield ratio upward trend in the over-aging temperature is 360 ℃, Appear to yield platform.