摘要
卷渣作为钢锭充型过程中形成的典型缺陷,直接影响钢锭最终质量。锭模底部水口形状是影响钢液流动和卷渣行为的关键因素,为了探究水口形状对卷渣行为的影响规律,基于Fluent多相流模型,通过考虑钢液、保护渣、空气三相间的相互作用及钢液充型过程的凝固行为,系统研究了水口入口角度(5°、15°、25°)对3.1 t钢锭充型过程流场、渣滴捕获等行为的影响。结果表明,充型初期钢锭尾部区域凝固壳较薄,且钢液内部流动性较好,渣滴会迅速上浮至渣层;随着充型高度的增加,水口入口角度的改变会显著影响钢液流动形式,入口角度越大,钢液主流股越向外侧壁面方向偏移;对于该锭型,水口入口角度为5°时,钢液内部涡流始终位于近液面未形成凝固坯壳区域,流动模式及凝固进程更利于抑制卷渣的发生。该研究可为下注法模铸生产中水口形状设计提供参考和指导。
As a typical defect formed during the ingot filling process,the slag entrapment directly affects the final quality of the steel ingot.The shape of the nozzle at the bottom of the ingot mold is a key factor influencing the flow of molten steel and the behavior of slag entrapment,in order to explore the influence law of the shape of the nozle on the slag entrapment behavior,this paper,based on the Fluent multiphase flow model,systematically studies the influence of the inlet angles of the nozzle(5°,15°,25°)on the behaviors such as the flow field and slag droplet capture during the filling process of a 3.1 t steel ingot by taking into account the interactions among the three phases of molten steel,mold powder,and air as well as the solidification behavior during the filling process of molten steel.The results show that:in the initial stage of the filling process,the solidified shell in the tail region of the steel ingot is relatively thin,and the internal fluidity inside the molten steel is good,so the slag droplets will quickly float up to the slag layer.W'ith the increase of the filling height,the change of the inlet angle of the nozzle will significantly affect the flow pattern of the molten steel.The larger the inlet angle is,the more the main stream of the molten steel will deviate towards the outer sidewall.For this type of ingot,when the inlet angle of the nozzle is 5°,the internal eddy current inside the molten steel is always located in the area near the liquid surface where the solidified ingot shell has not been formed.The flow patterm and the solidification process are more conducive to suppressing the occurrence of slag entrapment.This study can offer references and guidance for the design of nozzle shapes in bottom-pouring mold casting production.
作者
张连有
刘钦
肖佳
侯忠霖
艾新港
李胜利
Zhang Lianyou;Liu Qin;Xiao Jia;Huo Zhonglin;Ai Xingang;Li Shengli(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan,114051,China;Dongbei Special Steel Group Co.,Ltd.,Dalian,l16300,China)
出处
《特殊钢》
2026年第2期80-88,共9页
Special Steel
基金
辽宁省创新联合体重大专项(2023 JH1/11200012)
国家自然科学基金资助项目(52304352)
辽宁省高校基本科研业务费项目(LJ212410146038,LJ232410146036,LJ222410146022)
教育部“春晖计划”合作科研资助项目(202200042)
辽宁省科技厅博士科研启动基金计划资助项目(2023-BS-182)。
关键词
钢锭
多相流
水口入口角度
卷渣缺陷
Steel Ingot
Multiphase Flow
Inlet Angle of the Nozzle
Slag Entrapment Defect
