论文部分内容阅读
通过DIL805-A测定了C-Si-Mn系600MPa级冷轧双相钢的CCT曲线,并在Gleeble 3500上模拟了双相钢的冷轧连退工艺。得出以下结论:双相钢的连退均热温度控制在800~820℃,保温时间不小于2min,缓冷温度控制在650~700℃,快冷结束温度不高于330℃,冷速大于15℃/s。通过EBSD检测、透射电镜检测、力学性能检测,结果显示邯钢生产的C-Si-Mn成分体系600MPa级冷轧双相钢马氏体的体积分数约为18%,{111}面织构强度为5.3,双相钢中马氏体类型为低碳马氏体,通卷屈服强度为344~365MPa,抗拉强度为605~645MPa,伸长率为24.5%~27%。其性能完全能满足汽车厂冲压安全防撞件的要求。
The CCT curves of C-Si-Mn 600MPa cold-rolled dual-phase steel were measured by DIL805-A and the cold rolling back-and-forth process of dual-phase steel was simulated on Gleeble 3500. The following conclusions are obtained: the even and soak temperature of dual phase steel is controlled at 800 ~ 820 ℃, the holding time is not less than 2min, the slow cooling temperature is controlled at 650 ~ 700 ℃, the fast cooling end temperature is not higher than 330 ℃, the cooling speed is greater than 15 ° C / s. The results of EBSD, transmission electron microscopy and mechanical properties show that the volume fraction of martensite in C-Si-Mn system of 600MPa cold-rolled duplex steel is about 18% 5.3. The martensite type in the dual phase steel is low-carbon martensite. The yield strength of the coil is 344 to 365 MPa, the tensile strength is 605 to 645 MPa, and the elongation is 24.5% to 27%. Its performance can fully meet the automotive plant stamping safety crash requirements.