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利用Gleeble3500热模拟试验机研究了冷却工艺对热轧双相钢显微组织的影响,利用扫描电镜和拉伸试验对实验室轧制的双相钢进行了显微组织和力学性能分析。研究结果表明:试验用钢经830℃终轧后,空冷6~10 s后快冷至卷取温度(≤200℃),可得到室温组织为铁素体(90.7%)+马氏体的热轧双相钢,其屈服强度为335 MPa,抗拉强度为630 MPa,加工硬化率高达0.22,伸长率达26.6%,完全满足热轧DP590钢的要求,试样的马氏体细小弥散分布,平均铁素体晶粒尺寸较小,约为6.4μm,具有良好的冲压性能。
The effect of cooling process on the microstructure of hot-rolled dual-phase steel was investigated by Gleeble3500 thermal simulation tester. The microstructure and mechanical properties of the duplex-rolled steel were analyzed by scanning electron microscopy and tensile test. The results show that the test steel after finishing at 830 ℃ is cooled to coiling temperature (≤200 ℃) after air cooling for 6 ~ 10 s, and the ferrite (90.7%) + martensite at room temperature can be obtained Rolled dual-phase steel, the yield strength of 335 MPa, the tensile strength of 630 MPa, the work hardening rate of up to 0.22, elongation of 26.6%, fully meet the requirements of hot-rolled DP590 steel, the sample martensite fine dispersion , The average ferrite grain size smaller, about 6.4μm, with good stamping properties.