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.
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.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2005年第4期441-443,共3页
Journal of University of Science and Technology Beijing
关键词
铜
塑性
网状裂纹
连铸坯
copper
ductility
net crack
continuously cast slab
