ABSTRACT The distribution and transfer mechanism of MnS inclusions are distinguished from the solute segregation in a 500 kg steel ball. The increase of MnS inclusions is obvious from the surface to the center of the steel ball, while the increase of solute content is slight. The massive MnS inclusions converge in the channel zone and in heterogeneous zones. During solidification, the interface tension drives MnS inclusions to the frontier of the dendritic zone. Some inclusions trapped may float to induce the channel zone. Solidification contraction tears such channel zone to attract more melt enriched with inclusions. Some inclusions converge in the extra-dendritic melt. At later solidification stage, solidification contraction dominates the macro-distribution of extra-dendritic melt to produce the heterogeneous zones.

中文翻译：

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500kg钢球夹杂物异质性表征与分析

摘要 MnS 夹杂物的分布和转移机制不同于 500 kg 钢球中的溶质偏析。MnS夹杂物从表面到钢球中心明显增加，而溶质含量增加幅度不大。块状 MnS 夹杂物聚集在通道区和异质区。在凝固过程中，界面张力将 MnS 夹杂物驱动到枝晶区的前沿。一些夹杂物可能会漂浮以形成通道区。凝固收缩撕裂这种通道区以吸引更多富含夹杂物的熔体。一些夹杂物会聚在枝晶外熔体中。在凝固后期，凝固收缩支配了枝晶外熔体的宏观分布，产生了异质区。