物理学报2009，Vol.58Issue(z1)：104-111,8.
考虑固相移动的大尺寸钢锭宏观偏析数值模拟
Modelling of macrosegregation in large steel ingot with considering solid movement
摘要
Abstract
Based on the Eulerian and the volume averaging methods, a mathematical model of macrosegregation formation with considering solid movement during solidification of large steel ingot is developed. The cases with and without solid movement are studied and compared. The result shows that the A segregation band results from a narrow channel that forms around the position where the solidified shell in the horizontal direction meets the one in the vertical direction, which serves as a barrier to the fluid flow, leading to the accumulation of solute. Effects of critical solid fraction and density of solid on evolution of macrosegregation are investigated. The results indicate that both the positive segregation in the A segregation band and the bottom negative segregation become more pronounced with the critical solid fraction increasing. As the density of solid increases, stronger macrosegregations occur at the upper and bottom parts of the ingot. However, the length of A segregation band is not increased with density of solid. Calculated results show good agreement with experimental ones, except a larger bottom negative segregation zone.关键词
宏观偏析/固相移动/A型偏析形成/数值模拟Key words
macrosegregation/solid movement/formation of A segregation/numerical simulation分类
数理科学引用本文复制引用
刘东戎,桑宝光,康秀红,李殿中..考虑固相移动的大尺寸钢锭宏观偏析数值模拟[J].物理学报,2009,58(z1):104-111,8.基金项目
中国博士后科学基金(批准号: 20080431162)和中国科学院知识创新工程重要方向性项目(批准号: KGCXZ-YW-206)资助的课题.Project supported by the Science Foundation for Postdoctor of China (Grant No. 20080431162) and the Main Direction Program of the Knowledge Innovation of Chinese Academy of Sciences (Grant No. KGCXZ-YW-206). （批准号: 20080431162）
