Influence of Superheat on Macrosegregation in Continuously Cast Steel Billet from Statistical Maximum Viewpoint
Influence of Superheat on Macrosegregation in Continuously Cast Steel Billet from Statistical Maximum Viewpoint
复制标题
从统计极大值角度观察过热度对连铸钢坯宏观偏析的影响
DOI：
10.2355/isijinternational.isijint-2020-515
复制
发表时间：
2021-01-01
影响因子：
1.8
通讯作者：
Cao, Jianghai
中科院分区：
文献类型：
--
作者：
Guo, Dongwei;Hou, Zibing;Cao, Jianghai
高碳钢方坯是生产高强度帘线制品的重要原材料。然而，连铸过程中碳含量高、分配系数低，容易产生碳的宏观偏析，严重影响高强度帘子线产品的质量一致性。在凝固的最后阶段，富集溶质的流动将导致等轴晶区的宏观偏析缺陷2)，这些缺陷将在铸造方向上表现为V形偏析和中心偏析，这些缺陷在横截面上不易检测到，并且总是反映出垂直截面上碳含量的波动。同时，这种内容的波动，特别是内容分布的最大值，往往会导致产品的性能失效。因此，研究高碳钢方坯垂直区的宏观偏析缺陷对提高帘线产品质量具有重要意义。在连铸过程中，过热度通过改变凝固过程来影响铸坯宏观偏析的形成。从统计极大值观点看，过热度对连铸坯宏观偏析的影响
High carbon steel billet is an important raw material for high-strength cord products. However, carbon macrosegregation is prone to occur during the continuous casting process due to the high carbon content and low partition coefficient,1) which seriously affect the quality uniformity of high-strength cord products. During the final stage of solidification, the flow of enriched solute will lead to macrosegregation defects in the equiaxed crystal zone2) and these defects will be presented as V-shaped segregation and centerline segregation along the casting direction, which cannot be detected in the transverse section easily and always indicate the fluctuation of carbon content in the vertical section. Meanwhile, performance failures of product can always be caused by this kind of content fluctuation, especially by the maximum value in the content distribution. Thus, the research on the macrosegregation defects in the vertical section of high carbon steel billets is important to improve the cord product quality. During the continuous casting process, the superheat can affect the formation of macrosegregation in billets by changing the solidification process and the solidificaInfluence of Superheat on Macrosegregation in Continuously Cast Steel Billet from Statistical Maximum Viewpoint