A three-dimensional mathematic model based on segmentation that joins the electromagnetic field, melt flow, heat transfer, solidification and solute transport in the whole casting domain has been established to study the solute transport at the final stage of solidification in a bloom continuous casting process. The effects of the final electromagnetic stirring (F-EMS) positions on the macrosegregation degree of the as-cast bloom are compared and analyzed. The results show that the maximum carbon segregation degree, the ratio of the local carbon concentration to the initial carbon concentration, is reduced from 1.292 to 1.254 with the application of F-EMS. In addition, the position of F-EMS is also an important factor. The maximum carbon segregation degrees are 1.254, 1.237 and 1.269 when the installation location of F-EMS is 14 m, 16 m and 18 m away from the meniscus, respectively. The optimal center solid fraction is about 0.1 at the F-EMS center for this study.

中文翻译：

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使用 F-EMS 改进连铸大方坯宏观偏析的数值模拟

建立了一个基于分段的三维数学模型，将整个铸造域的电磁场、熔体流动、传热、凝固和溶质输运结合起来，研究大方坯连铸过程中凝固最后阶段的溶质输运。 . 比较分析了最终电磁搅拌（F-EMS）位置对铸态大方坯宏观偏析度的影响。结果表明，随着F-EMS的应用，最大碳偏析度，即局部碳浓度与初始碳浓度之比，从1.292降低到1.254。此外，F-EMS的位置也是一个重要因素。F-EMS安装位置为14 m时，最大碳偏析度分别为1.254、1.237和1.269，分别距弯液面 16 m 和 18 m。本研究的 F-EMS 中心的最佳中心固体分数约为 0.1。