内置式搅拌磁场对连铸空心铸坯内夹杂物分布影响  

Effect of Electromagnetic Stirring in Internal Mold on Inclusions Distribution of Continuous Casting Hollow Billets

作　　者：张琦[1] 吴滟帮 李欢 

机构地区：[1]青岛理工大学机械工程学院,山东青岛266033

出　　处：《铸造技术》2018年第1期111-115,119,共6页Foundry Technology

基　　金：国家自然科学基金资助项目(51204101);青岛市应用基础研究计划资助项目(14-2-4-109-jch)

摘　　要：耦合求解了电磁场方程以及夹杂物守恒方程,考虑了夹杂物间的湍流碰撞以及斯托克斯碰撞,计算获得了拉速以及行波式电磁搅拌对结晶器内夹杂物分布的影响规律。结果表明,结晶器内夹杂物的运动规律与钢液的流动状态密切相关,拉速越大,钢液的浸入深度越深,则结晶器出口处夹杂物的数量越多,夹杂物的尺寸越小。施加行波式搅拌磁场可以使钢液流动加强,并减小钢液的浸入深度,有利于夹杂物的聚集长大上浮,结晶器内夹杂物的尺寸较大,但数量减少。因此,在连铸空心管坯内部施加搅拌磁场有利于去除钢中夹杂物,从而改善连铸空心管坯的质量。The effect of the stirring electromagnetic field in the internal mold on the inclusions during the hollow billet continuous casting was analyzed with numerical simulation method, and the electromagnetic field equation and mass-population conservation equation of inclusions were established, and the turbulent collision and stokes collision between inclusions were considered. The results show that the inclusions in the crystallizer motion law is closely related to the flow of the molten steel, drawing speed, the greater the immersion depth of the molten steel, the large number of inclusions will be gathered at the outlet of the crystallizer, and the size of the inclusions is smaller. Travelling wave type stirring magnetic field can make the molten steel flow, and reduce the size of the immersion depth of the molten steel, it is advantageous to the inclusion of gathered grew up and rising, the inclusions size is larger in the crystallizer, but the quantity is few. Therefore, it is advantageous to apply the stirring magnetic field inside the hollow tube billet to remove the inclusions in the steel, thus improving the quality of the hollow tube billet.

关 键 词：行波电磁搅拌 内结晶器 夹杂物 连铸空心管坯 拉速 

分 类 号：TF777.1[冶金工程—钢铁冶金]