以国内某钢厂82B方坯连铸坯为研究对象,观察V型偏析在横、纵截面上的分布,并研究碳元素的中心偏析现象.结果表明:V型偏析产生于中心等轴晶区,在纵向上表现为多个V字上下嵌套、交织在一起,横向上表现为一组同心圆结构;通道区内碳元素偏析严重,是影响82B高碳钢线材质量的重要原因;V型偏析的产生与富集溶质液相的流动以及凝固组织有关,扩大等轴晶区、细化等轴晶粒有助于减轻V型偏析.
In this paper 82B steel billet cast by a Chinese domestic steel plant had been investigated with regards to the distribution of V-shape segregation in transverse and longitudinal section,and center segregation of carbon as well.The results showed that V-shape segregation occurred in central equiaxed crystal zone,and carbon segregation was much serious in V-shaped channels; The generation of V-segregation is related with flow of solute enriched liquid and solidification structure.Both expanding equiaxed crystal zone and refining the equiaxed crystal zone are two effective ways to reduce V-segregation.
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