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钢中残余元素对连铸圆坯纵裂的影响 被引量:3

EFFECT OF RESIDUALS ON LONGITUDINAL CRACKS OF CC ROUND BILLET
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摘要 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925~1000℃,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。 Hot ductility of round billets with different content of residuals has been in vestigated by Gleeble test The results show that hot ductility of the billet with Cu+10Sn=0 32 % is remarkably dropped in the region from 1000 to 925 ℃,especially at 950 ℃ The intergranular failure and Sn segregation on the grain boundary at 950 ℃ were measured by SEM and AES By analyzing CC conditions,it is considered that if temperature of initial solidified shell in mold is within the embrittlement region at low casting speed,the longitudinal cracks may be occurred
出处 《钢铁》 CAS CSCD 北大核心 1998年第9期21-24,共4页 Iron and Steel
关键词 连铸 圆坯 热塑性 残余元素 纵裂 continuous casting,round billet,hot ductility,residuals,longitudinal cracks
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