CAFE simulation of electroslag remelting GH984G directional solidification structure
AN Rui-dong1, LIU Fu-bin1, CHEN Kui1, GAO Jun-zhe1, KANG Cong-peng1, JIANG Zhou-hua1,2
1. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China; 2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China
Abstract：The control of electroslag remelting solidification structure is directly related to the quality of superalloys and actual production applications. Aiming at the directional solidification process of electroslag remelting GH984G, considering heat transfer and solute diffusion, based on the combination of CAFE method and C language, a three-dimensional microstructure evolution model of the electroslag remelting solidification process is established, and the temperature field and solidification structure evolution are simulated and predicted. The results show that, the ingot temperature field and bath depth are shallow and flat at first, then deepen until finally stable. At the beginning of electrode melting, the molten pool is shallow and the growth direction of the dendrite is vertical upward, and then the molten pool deepens continuously, and the vertical upward columnar crystal direction at the bottom becomes about 26 ° oblique upward. At the same time, equiaxed crystals appear on the centerline of the ingot, and the equiaxed crystals grow with columnar crystals after nucleation and growth. Besides, with the increase of the electrode melting rate, the rising speed of the slag metal interface increases, and the depth bath becomes wider and deeper. The simulation results are consistent with the experimental results, which verifies the applicability of the model and nucleation parameters.
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2021, Vol. 56 
