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选择添加铬、钼合金元素的碳、锰、硅系的高强双相钢DP600为研究对象,选择Gleeble-3800热模拟试验机为研究方法测定了DP600动态CCT曲线,并模拟DP600双相钢热轧过程。采用金相组织观察、织构分析及力学性能测试等手段分析了不同工艺制度下双相钢组织及织构变化规律以及对性能的影响,从中获得最佳组织配比及优化的热轧工艺参数。根据优化的中试结果,进行了热轧双相钢DP600的工业试制。结果表明,试制样品的显微组织为铁素体及马氏体;屈强比均小于0.65,抗拉强度均在600 MPa以上;伸长率在24%以上;其拉伸曲线均为连续曲线,无屈服点伸长,具有典型的双相钢特征。
Select the high-strength dual-phase steel DP600 with carbon, manganese and silicon added chromium and molybdenum alloy as the research object, choose the Gleeble-3800 thermal simulation testing machine as the research method to determine the dynamic CCT curve of DP600 and simulate the hot rolling of DP600 duplex steel process. The microstructure and texture of the duplex steel were studied by means of microstructure observation, texture analysis and mechanical properties test. The results showed that the optimum microstructure and the optimized hot rolling parameters . Based on the optimized pilot results, an industrial trial of hot-rolled dual-phase DP600 was carried out. The results show that the microstructure of the prototype is ferrite and martensite; the flexural strength ratio is less than 0.65, the tensile strength is above 600 MPa; the elongation is above 24%; the tensile curves are continuous curves , No yield point elongation, with a typical dual-phase steel characteristics.