论文部分内容阅读
本文以包钢TSCR生产线生产的5mm厚加硼低碳冷轧基板为研究对象,利用光学显微镜、扫描电镜观察了含硼热轧、退火板的金相组织,并通过拉伸试验以及电解化学相分析实验研究了卷取温度对钢板深冲性能的影响,对冷轧基板中第二相粒子强化作用的影响做了深入探讨。研究表明,卷取温度影响热轧后铁素体晶粒的大小,卷取温度越高,晶粒平均尺寸越大。钢板的伸长率和n值分别在50%和0.23左右。四个卷取温度相比较,深冲钢屈服强度和抗拉强度差异不大,r值达到最大值1.466,获得良好的深冲性能。粒度分析表明,570℃卷取冷轧钢板中析出M3C粒子在1～10nm的占钢的质量分数为0.0445%,比600℃卷取冷轧钢板中析出的M3C粒子高0.0028%,对强度贡献大。
In this paper, the 5 mm thick boron-added low-carbon cold-rolled substrate produced by Baosteel TSCR production line was taken as the research object. The microstructure of the hot-rolled and annealed boron-containing sheet was observed by optical microscope and scanning electron microscope. The influences of coiling temperature on the deep drawing properties of the steel plate were analyzed experimentally, and the influence of the coercivity of the second phase particles in the cold-rolled substrate was discussed in detail. The results show that the coiling temperature affects the ferrite grain size after hot rolling. The higher the coiling temperature, the larger the average grain size. Steel elongation and n values were about 50% and 0.23, respectively. Compared with the four coiling temperatures, the difference between yield strength and tensile strength of deep-drawn steel is not significant, r value reached the maximum value of 1.466, and good deep-drawing performance was obtained. Particle size analysis showed that the mass fraction of M3C particles precipitated at 570 ℃ in 1 ~ 10nm accounted for 0.0445%, which was 0.0028% higher than that of M3C particles precipitated in 600 ℃ cold rolled steel sheet, which contributed greatly to the strength .