中南大学学报（自然科学版）2017，Vol.48Issue(12)：3160-3169,10.DOI:10.11817/j.issn.1672-7207.2017.12.004
连铸板坯全冶金长度凝固形貌
Solidification morphology for full metallurgical length of continuous casting slab
摘要
Abstract
Steel solidification for continuously cast low carbon slab was calculated using a coupled model of CAFE in combination with the temperature distribution in the full metallurgical length, which was predicted by the moving boundary method. Further, the influences of steel superheat and casting speed on the central temperature of slab wide-surface, morphology of slab section and secondary dendritic arm spacing were investigated, and the relationship between arm spacing and cooling rate of steel as well as the central carbon segregation of slab were analyzed. The results show that the decreases of superheat and casting speed lead to the reductions of central temperature and arm spacing, and the impact from casting speed is more significant. Ratio of equiaxed zone increases with casting speed and the grain radius decreases, and it is conducive to improve the continuous casting slab quality, while the superheat does not have significant effect on casting speed and grain radius. Secondary dendritic arm spacing is formed and increased in mushy zone, and it presents an exponential trend with cooling rate. Central carbon segregation distributes in the central line of slab in the form of islands, and the maximum segregation index reaches 1.14. Enriched solute elements around the dendrites are pumped into the steel by negative pressure and then generate the negative segregation.关键词
连铸板坯/宽面中心温度/微观组织形貌/二次枝晶臂间距/碳偏析Key words
continuous casting slab/center temperature of wide surface/morphology/secondary dendritic arm spacing/carbon segregation分类
矿业与冶金引用本文复制引用
王鑫,孟祥宁,黄烁,朱苗勇..连铸板坯全冶金长度凝固形貌[J].中南大学学报（自然科学版）,2017,48(12):3160-3169,10.基金项目
国家自然科学基金资助项目(51004031) （51004031）
中央高校基本科研业务费资助项目(N140205002)(Project(51004031) supported by the National Natural Science Foundation of China （N140205002）
Project(N140205002) supported by the Fundamental Research Funds for the Central Universities) （N140205002）
