Morphology and segregation in continuously cast high carbon steel billets
Morphology and segregation in continuously cast high carbon steel billets
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DOI：
10.2355/isijinternational.47.1759
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发表时间：
2007-01-01
影响因子：
1.8
通讯作者：
Ganguly, Suvankar
中科院分区：
文献类型：
--
作者：
Choudhary, S. K.;Ganguly, Suvankar
为了确定六流弧形结晶器方坯连铸机在无电磁搅拌条件下的浇注行为，研究了高碳钢方坯连铸过程中的组织形态和中心宏观偏析。从印度塔塔钢铁公司的连铸车间采集了几个方坯样品，并将实验观察结果与连铸机的操作参数进行了关联。宏观组织分析表明，在中间包过热度高于21℃时，所有铸坯均以柱状组织为主，并伴有高度偏析和疏松。在21℃以下浇注的铸坯几乎没有中心线疏松。这些铸坯表现出明显的V型偏析和较不明显的中心线偏析。在21℃过热度附近观察到从U偏析到V偏析的转变。通过测量铸坯样品中不同位置的二次枝晶臂间距来研究二次冷却的有效性。最后，对各组分溶质元素的偏析程度进行了关联，并对一种简单的偏析模型对中线宏观偏析的适用性进行了检验。
Morphology and centerline macrosegregation in continuously cast high carbon steel billet samples were investigated in order to establish the casting behavior of a six strand curved mold billet caster without electro-magnetic stirring. Several billet samples were collected from the continuous casting shop of Tata Steel, India and experimental observations were correlated with the operating parameters of the caster. Macrostructural examination revealed predominantly columnar structure associated with high degree of segregation and porosities in all billets cast above 21 degrees C of tundish superheat. Centerline porosity was practically absent in the billet cast below 21 degrees C. These billets showed prominent V-segregation and less prominent centerline segregation. Transition from U-segregation to V-segregation was observed around 21 degrees C superheat. An attempt has been made to study the effectiveness of secondary cooling by measurements of the secondary dendrite arm spacing at various locations in billet samples. Finally, degree of segregation of constituent solute elements were correlated among themselves and applicability of one of the simple segregation models to the centerline macrosegregation has been tested.