SPA-H薄板坯高温力学性能研究
Study on High-temperature Mechanical Properties of SPA-H Steel Thin Slab
鲍思前1,2, 毛新平3, 赵 刚1, 李 磊1
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作者单位：(1. 武汉科技大学 钢铁冶金及资源利用省部共建教育部重点实验室, 湖北 武汉 430081; 2. 广州钢铁企业集团 CSP应用技术研究所, 广东 广州 510730; 3. 广州珠江钢铁有限责任公司, 广东 广州 510730)
中文关键字：SPA-H薄板坯； 高温力学性能； 应变速率
英文关键字：SPA-H steel thin slab; high-temperature mechanical properties; strain rate
中文摘要：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。
英文摘要：The high-temperature mechanical properties of SPA-H steel thin slab produced by compact strip production(CSP) process were tested on MMS-200 thermal simulator under different atmosphere conditions. The results show that the percentage reduction of area of the tested steel is greater than 70% at strain rate of 10-3 s-1 within the range from 950 ℃to 1250℃ in argon atmosphere, thus the steel has higher resistance to high-temperature cracking. However, the percentage reducion of area decreases rapidly when the testing temperature is above 1050 ℃ in air atmosphere and the minimum percentage reducion of area is only about 40% at 1100 ℃. This is because some copper-rich phase is penetrated along metal grain boundaries by microstructure analysis, which can reduce the high-temperature ductility of the slab.