钢中残余元素对连铸圆坯纵裂的影响  

EFFECT OF RESIDUALS ON LONGITUDINAL CRACKS OF CC ROUND BILLET

作　　者：陈伟庆[1,2] 昌波 于平[1,2] 

机构地区：[1]北京科技大学 [2]天津钢管公司

出　　处：《钢铁》1998年第9期21-24,共4页Iron and Steel

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

关 键 词：连铸 圆坯 热塑性 残余元素 纵裂 

分 类 号：TF777[冶金工程—钢铁冶金]