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通过模拟试验研究了热轧卷取温度对气冷退火冷轧双相钢的组织性能的影响,并采用ThermoCalc相图计算进行理论分析。结果表明:热轧高温卷取一方面可使冷轧退火后得到相对粗大的晶粒,有利于降低双相钢的屈服强度;高温卷取产生的晶界锰偏聚可以增加双相钢退火冷却时奥氏体的淬透性,在退火冷却时得到更多马氏体,从而提高双相钢的抗拉强度。因此,热轧高温卷取的冷轧气冷退火双相钢具有更低的屈强比和更好的塑性,从而获得更好的成形性能。
The influence of hot coiling temperature on the microstructure and properties of cold-rolled dual-phase steel with gas-cooled annealing was studied by simulating experiments. The theoretical analysis was carried out by ThermoCalc phase diagram calculation. The results show that the high temperature coiling of hot rolling can make the relatively coarse grains after cold rolling anneal and reduce the yield strength of dual phase steel. The segregation of grain boundary manganese produced by high temperature coiling can increase the annealing cooling When the austenite hardenability, cooling more annealed martensite, thereby increasing the dual-phase steel tensile strength. As a result, cold-rolled, cold-annealed, dual-phase steels that are hot-rolled at high temperature coiling have lower yield ratios and better ductility, resulting in better formability.