使用Gleeble机测定了不同残余元素含量的连铸圆坯试样的高温力学性能,结果表明:Cu当量(Cu+10Sn)＝0.32 %的试样在925～1 000 ℃,特别是在950 ℃的热塑性显著降低;扫描电镜和俄歇检验发现,此温度下试样为沿晶断裂,在奥氏体晶界有Sn偏析.分析连铸生产条件认为,如拉速较低,结晶器内初生坯壳温度处于此高温脆性区,圆铸坯将可能产生纵裂.
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