摘要
以Clyne-Kurz方程为基础建立了取向硅钢连铸过程的微观偏析模型,研究了取向硅钢连铸凝固过程中溶质元素在液相中的偏析规律。通过比较连铸凝固过程中锰和硫实际活度积和平衡活度积的关系,确定了MnS的析出条件。结果表明:二次枝晶间距随着冷却速率的增加而减小,柱状晶区域二次枝晶间距为191.3μm,元素的分配系数越小,其偏析程度越大,并且溶质偏析程度随着固相率的增加而增大,当凝固分数达到0.997时,MnS开始析出。
Based on CLYNE-Kurz model,segregation model of grain-oriented silicon steel during solidification of continuous casting was established,segregation of Mn and S elements in liquid phase during solidification of continuous casting was calculated,and the relationship between actual concentration product and equilibrium concentration product of Mn and S during solidification of continuous casting was compared.The results show that the secondary dendrite spacing decreases with the increase of cooling rate.The secondary dendrite spacing in columnar region is 191.3μm.The degree of segregation increases with the decrease of the distribution coefficient of elements.The degree of solute segregation increases with the increase of solid fraction.When the solidification fraction reaches 0.997,MnS begins to precipitate.
作者
刘磊
乔家龙
郭飞虎
项利
仇圣桃
Liu Lei;Qiao Jialong;Guo Feihu;Xiang Li;Qiu Shengtao(Engineering and Research Center for Continuous Casting Technology,Central Iron and Steel Research Institute,Beijing100081,China;College of Metallurgical Engineering,Anhui University of Technology,Ma’anshan243032,Anhui,China)
出处
《钢铁钒钛》
CAS
北大核心
2019年第2期117-120,共4页
Iron Steel Vanadium Titanium
基金
国家重点研发计划(2016YFB0300305)
关键词
取向硅钢
连铸
凝固
偏析
析出
grain-oriented silicon steel
continuous casting
solidification
segregation
precipitation
