Numerical simulation of inclusions movement in vacuum induction melting
WANG Ning1, GAO Jin-guo1, YANG Shu-lei1, YANG Shu-feng1, LIU Meng2, SU Ru3
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Technology Center, Zhonghangshangda Superalloys Co., Ltd., Xingtai 054800, Hebei, China; 3. School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, Hebei, China
Abstract：In order to promote the removal of inclusions in the vacuum induction melting(VIM) of GH4169 alloy, a coupled electromagnetic-flow-particle tracking mathematical model was established, and the laws of melt flow and inclusions movement in vacuum induction melting were studied. The characteristics of flow field and inclusions movement in the melt pool with different smelting process parameters were compared, and a optimization method to promote removal of inclusions in vacuum induction melting was proposed. The results show that there are two vortices in the flow field of melt pool, accelerating the velocity of which can promote the removal of inclusions. The melt flow velocity increases firstly, then decreases with the process of smelting, and eventually stabilises. As the voltage increasing, the average melt flow velocity and the total removal rate of inclusions in the melt pool are both increased. As the current frequency increasing, the average melt flow velocity and the total removal rate of inclusions in the melt pool are both decreased. Therefore, the melt flow velocity can be increased by increasing the voltage and decreasing the current frequency, so as to achieve the effect of promoting inclusion removal in VIM of GH4169 alloy. The VIM process parameters optimized from 400 V, 3 400 Hz to 420 V, 3 200 Hz, which increased the total inclusions removal rate from 91.98% to 94.87%, and the rate increased by 2.89%.
王宁, 高锦国, 杨曙磊, 杨树峰, 刘猛, 苏孺. 真空感应熔炼中夹杂物运动行为数值模拟[J]. 中国冶金, 2021, 31(12): 20-26.
WANG Ning, GAO Jin-guo, YANG Shu-lei, YANG Shu-feng, LIU Meng, SU Ru. Numerical simulation of inclusions movement in vacuum induction melting[J]. China Metallurgy, 2021, 31(12): 20-26.
Alexis Queva, Gildas Guillemot, Clara Moriconi, et al. Numerical study of the impact of vaporisation on melt pool dynamics in laser powder bed fusion-Application to IN718 and Ti-6Al-4V[J]. Additive Manufacturing, 2020, 35:101249.
Baake E, Nacke B, Bernier F, et al. Experimental and numerical investigations of the temperature field and melt flow in the induction furnace with cold crucible[J]. Compel: The International Journal for Computation & Mathematics in Electrical & Electronic Engineering, 2013, 22(1):88.
[5]
Bulinski P, Smolka J, Siwiec G, et al. Numerical examination of the evaporation process within a vacuum induction furnace with a comparison to experimental results[J]. Applied Thermal Engineering, 2019, 150:348.
[6]
Schwarze R, Obermeier F. Modelling of unsteady electromagnetically driven recirculating melt flows[J]. Modelling and Simulation in Materials Science and Engineering, 2004, 12(5):985.
[7]
Mihails Ščepanskis, Andris Jakovičs, Egbert Baake, et al. Solid inclusions in an electromagnetically induced recirculated turbulent flow: Simulation and experiment[J]. International Journal of Multiphase Flow, 2014, 64:19.
YANG B, LEI H, BI Q, et al. Electromagnetic conditions in a tundish with channel type induction heating[J]. Steel Res. Int., 2018, 89:1800145.
[10]
Wang Q, Li B K, Tsukihashi F. Modeling of a thermo-electromagneto-hydrodynamic problem in continuous casting tundish with channel type induction heating[J]. ISIJ Int, 2014, 54(2):311.
Asad A, Bauer K, Chattopadhyay K, et al. Numerical and experimental modeling of the recirculating melt flow inside an induction crucible furnace[J]. Metall. Mater. Trans. B, 2018, 49(3):1.
[17]
Asish Kumar Sinha, Yogeshwar Sahai. Mathematical modeling of inclusion transport and removal in continuous casting tundishes[J]. ISIJ International, 1993, 33(5):556.
[18]
You Jong Kwon, Jian Zhang, Hae Geon Lee. A CFD-based nucleation-growth-removal model for inclusion behavior in a gas-agitated ladle during molten steel deoxidation[J]. ISIJ International, 2008, 48(7):891.
2021, Vol. 31 
