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在MMS-200热力模拟试验机上进行高温拉伸试验,测试了不同气氛条件下CSP薄板坯连铸工艺生产的SPA-H钢的高温力学性能。结果表明:在氩气保护气氛条件下,应变速率为1×10-3/s时,950～1250℃断面收缩率都大于70%,具有良好的高温塑性。在大气气氛条件下,当拉伸温度超过1050℃后,试样的断面收缩率迅速减小,在1100℃时断面收缩率取得最小值,只有40%左右。显微组织分析得出,这主要是因为Cu的富集相沿晶界向钢内部浸润,降低了铸坯的高温塑性。
The high temperature tensile test was carried out on the MMS-200 thermodynamic simulator to test the high temperature mechanical properties of SPA-H steel produced by CSP thin slab continuous casting process under different atmosphere conditions. The results show that under the atmosphere of argon gas, the reduction of area from 950 ℃ to 1250 ℃ is more than 70% at strain rate of 1 × 10-3 / s, which shows good high temperature plasticity. Under atmospheric conditions, when the stretching temperature exceeds 1050 ℃, the cross-sectional shrinkage of the sample decreases rapidly, and the minimum value of the cross-sectional shrinkage is obtained at 1100 ℃, only about 40%. Microstructure analysis shows that this is mainly due to the enrichment of Cu along the grain boundary infiltration into the steel, reducing the high temperature ductility of the slab.