重庆理工大学学报(自然科学) ›› 2023, Vol. 37 ›› Issue (4): 141-150.

• 机械·材料 • 上一篇    下一篇

脉冲磁场去除钢中 Al2O3夹杂物的研究

罗坤坤,李 涛,李莉娟   

  1. 上海大学 材料科学与工程学院,先进凝固技术中心,上海 20044
  • 出版日期:2023-05-06 发布日期:2023-05-06
  • 作者简介:罗坤坤,男,硕士研究生,Email:luok19@shu.edu.cn;通信作者 李莉娟,女,博士,副教授,主要从事外场下的材 料加工研究,Email:neullj@163.com

Study on removing Al2O3 inclusions in steel by pulsed magnetic fields

  • Online:2023-05-06 Published:2023-05-06

摘要: 为了探究脉冲磁场对钢中 Al2O3 夹杂物的去除效果,使用中频感应炉进行了熔炼 实验。利用 COMSOL多物理场软件对脉冲磁场作用下钢液流场和不同尺寸夹杂物的去除行为 进行了数值模拟,将数值模拟与实验结果相结合,探讨了脉冲磁场作用对钢中 Al2O3 夹杂物的 去除机制。实验发现,施加脉冲磁场处理后,钢中 Al2O3 夹杂物整体含量减少,小尺寸的 Al2O3 夹杂物数量百分比降低,大尺寸的 Al2O3 夹杂物数量百分比有所增加,表明施加脉冲磁场促进 了 Al2O3夹杂物的去除和碰撞长大。数值模拟结果表明,施加脉冲磁场处理时,钢液中形成上 下双环流,促进了夹杂物的去除,且夹杂物尺寸越大,去除效率越高;同时,夹杂物大部分被分离 至壁面,与实验观察结果一致。

关键词: 数值模拟, 脉冲磁场, Al2O3夹杂物, 去除效率

Abstract: In order to explore the effect of a pulsed magnetic field on the removal of Al2O3 inclusions in steel, this paper carries out smelting experiments by using an intermediate frequency induction furnace. Then, numerical simulation of the flow field of molten steel and the removal of inclusions of different sizes under the action of the pulsed magnetic field is carried out through the software COMSOL multi-physics field. Combining the numerical simulation results with the experimental results, the removal mechanism of Al2O3 inclusions in steel under the pulsed magnetic field is discussed. The experimental results show that, after the pulsed magnetic field treatment, the total content of Al2O3 inclusions in steel decreases, the percentage of small-sized Al2O3 inclusions decreases, and the percentage of larger-sized Al2O3 inclusions increases, which indicates that the pulsed magnetic field promotes the removal and the collision growth of Al2O3 inclusions. The numerical simulation results show that, when the pulsed magnetic field is applied, upper and lower double circulations form in the molten steel, which promotes the removal of inclusions. The larger the size of inclusions is, the higher the removal efficiency will be. Meanwhile, most of the inclusions are separated to the wall surface, which is consistent with the experimental results.

中图分类号: 

  • :TF741.7