中碳合金钢连铸板坯中间裂纹形成机理研究  

Formation Mechanism of Central Crack of Continuous Casting Slab of Medium Carbon Alloy Steel

作　　者：甄新刚[1] 张炯明[1] 龚雅林[1] 王伟[1] 姚永宽 王道远 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]南京钢铁集团中厚板卷厂,江苏南京210035

出　　处：《铸造技术》2010年第5期575-578,共4页Foundry Technology

摘　　要：针对中碳合金钢连铸板坯出现的中间裂纹,利用低倍酸洗、光学显微镜、扫描电镜和能谱仪对中间裂纹宏观和微观特征进行检验分析,发现在裂纹处元素锰、磷、硫有明显的富集,钢中锰、硫、磷等杂质元素的晶间偏析是铸坯产生中间裂纹的内因。确定了铸坯凝固过程中中间裂纹的产生位置,计算出凝固时铸坯在此位置的总应变,发现铸坯承受的载荷是裂纹产生和扩展的外因。Based on the central crack of continuous casting slab, various techniques such as acid wash, optical microscope and SEM were used to test and analyse central crack, the results show that there are serious element segregations such as manganese, phosphor and sulfur in the crack band, the intergranular segregation of some elements such as manganese, phosphor and sulfur is the inner cause of producing in central crack. The position of central crack was determined, and the total strain in this position at solidifying front of the slab was calculated, it shows that the loads of the slab are the outer cause of forming and extending in central crack. It is available for reference to improve the quality of continuous casting slab.

关 键 词：连铸板坯 中间裂纹 晶间偏析 应变 

分 类 号：TF777[冶金工程—钢铁冶金]