连铸坯点状偏析缺陷研究进展  

Research progress on spot segregation defects in continuously cast semi-products

作　　者：兰鹏[1] 铁占鹏 张伟[2] 苗红生[2] 严清忠[2] 张家泉[1] LAN Peng;TIE Zhan-peng;ZHANG Wei;MIAO Hong-sheng;YAN Qing-zhong;ZHANG Jia-quan(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Center of Technology and Quality,Xining Special Steel Co.,Ltd.,Xining 810005,Qinghai,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]西宁特殊钢股份有限公司技术质量中心,青海西宁810005

出　　处：《钢铁》2020年第2期11-22,30,共13页Iron and Steel

基　　金：国家自然科学基金资助项目(U1860111,51604021)。

摘　　要：随着高端用户对钢材均质性要求的不断提高,国内企业和研究学者对连铸坯凝固组织与点状偏析的关注越来越多。点状偏析是管线钢、齿轮钢、弹簧钢、轴承钢等连铸坯中常见的溶质不均匀性缺陷,其尺寸在半宏观范畴,铸坯横断面上呈斑点状,纵断面上多呈V型,难以在后续的工艺中扩散去除,对产品使用性能具有重要影响。关于连铸坯点状偏析的形成机理已基本达成共识,但当前条件下彻底消除点状偏析仍具有非常大的技术难度。总结了作者近年来的研究工作和已报道的国内外研究成果,重点阐述了连铸坯点状偏析的概念、特征、危害、影响因素、形成机制和调控措施等,以期为其他学者提供一定的启发和参考。More attention from companies and researchers has been paid to the solidification structure and the spot segregation in steel continuous casting,as the demands of high-end users on homogeneity are gradually increasing.Spot segregation,a semi-macroscopic defect of solute inhomogeneity in continuous casting of pipeline steel,gear steel,spring steel,bearing steel,etc,is speckle shape in transverse section and V shape in longitudinal section.It is difficult to remove thoroughly in the following process by diffusion.Spot segregation takes a significant effect on the service property of steel products.The agreement on the formation mechanism of spot segregation during steel continuous casting was totally obtained,however,there is still a difficulty in technology to eliminate it under the present condition.Based on the research achievements in the author's team and the results in reported literatures,this review illustrated the definition,characteristics,detriment,influencing factors,formation mechanism and control measures of spot segregation.It is expected that it can provide some enlightenments and references for other researchers.

关 键 词：点状偏析 凝固组织 形成机制 调控措施 连铸坯 

分 类 号：TF777[冶金工程—钢铁冶金]