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连铸坯表面网状裂纹
引用本文:朱国森,王永胜,王新华,王万军.连铸坯表面网状裂纹[J].北京科技大学学报,2005,27(4):441-443.
作者姓名:朱国森  王永胜  王新华  王万军
作者单位:1. 首钢技术研究院,北京,100041
2. 北京科技大学冶金与生态工程学院,北京,100083
摘    要:对连铸坯和热轧厚板表面网状裂纹附近的化学成分及其组织进行了分析,发现裂纹附近存在Cu和Cr元素,裂纹沿着晶界延伸.可见裂纹形成的原因为:结晶器镀铬层磨损导致铜板与连铸坯粘结,液态铜通过奥氏体晶界向铁基体内渗透.富集在奥氏体晶界的铜极大地恶化了钢的塑性是导致裂纹形成的主要原因.在此基础上提出了控制连铸坯和热轧厚板表面网状裂纹的措施.

关 键 词:  塑性  网状裂纹  连铸坯  铸坯表面  网状裂纹  continuously  cast  cracks  控制  塑性  富集  内渗  铁基体  奥氏体  液态  粘结  铜板  磨损  镀铬层  结晶器  裂纹形成  延伸  晶界  元素
收稿时间:2004-04-10
修稿时间:2004-06-10

Surface net cracks of continuously cast slabs
ZHU Guosen,WANG Yongsheng,WANG Xinhua,WANG Wanjun.Surface net cracks of continuously cast slabs[J].Journal of University of Science and Technology Beijing,2005,27(4):441-443.
Authors:ZHU Guosen  WANG Yongsheng  WANG Xinhua  WANG Wanjun
Abstract:The chemical composition and microstructure near surface net cracks of continuously cast slabs and hot rolled plates were analyzed. The results showed that there exist Cu and Cr near the cracksand the cracks propagate along the vicinities of grain boundary. The reason of net cracks formation can be concluded that abrasion of the mold coating causes liquid copper to penetrate into the Fe matrix along the grain boundary ofaustenite and enriched copper will deteriorate the hot ductility of steel tremendously, on the basis of which, some measures to control surface net cracks were put forward.
Keywords:copper  ductility  net crack  continuously cast slab
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