To study the vacuum arc remelting process and improve the homogenization and cleanliness level of large-sized superalloy ingot, numerical simulation and industrial experiment were carried out to investigate the evolution of molten pool, solidification characteristics and inclusion distribution in a
ing vacuum arc remelting. The results show that as the melting progresses, the simulated molten pool morphology changes from a "shallow flat" shape to a "shallow U " shape. After melting for 500 minutes, the depth of the molten pool and the width of the mushy zone tend to stabilize, with maximum molten pool depth and mushy zone width being 200.88 mm and 72.38 mm respectively. During stable melting, the cooling rate at the surface and center of the casting ingot is 0.126K / s and 0.009 K/s, respectively, and after the height of the ingot is exceeds 0.4 m, the cooling rate of the casting ingot is basically stable.The trajectories of six particle size inclusions in the molten pool were simulated. Large size inclusions (
>
20 μm) were subjected to the fluid flow and buoyancy to move helically in the molten pool and were eventually trapped at the ingot sidewalls, while small size inclusions (≤10 μm) entered the molten pool and then moved inward along the bottom of the pool, eventually remaining inside the ingot, which is basically consistent with the detection value of the industrial ingot.
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Semiatin S L , Fagin P N , Glavicic M G , et al . Deformation behavior of Waspaloy at hot-working temperatures [J]. Scripta Materialia , 2004 , 50 ( 5 ): 625 - 629 .
Xu H , Yang S F , Wang E H , et al . Competitive oxidation behavior of Ni-based superalloy GH4738 at extreme temperature [J]. International Journal of Minerals, Metallurgy and Materials , 2024 , 31 ( 1 ): 138 - 145 .
Chen Z Y , Yang S F , Qu J L , et al . Effects of different melting technologies on the purity of superalloy GH4738 [J]. Materials , 2018 , 11 ( 10 ): 1838 .
Moyer J M , Jackman L A , Adasczik C B , et al . Advances in triple melting superalloys 718, 706, and 720 [C]. Superalloys 718, 625, 706 and Various Derivatives (1994) . 1994 : 39 - 48 .
Loria E A . Recent developments in the progress of superalloy 718 [J]. JOM , 1992 , 44 ( 6 ): 33 - 36 .
Zhao P , Gu Y , Yang S F , et al . Study on the molten pool behavior, solidification structure, and inclusion distribution in an industrial vacuum arc remelted nickel-based superalloy [J]. Metallurgical and Materials Transactions B , 2023 , 54 ( 2 ): 698 - 711 .
Jardy A , Ablitzer D . Mathematical modelling of superalloy remelting operations [J]. Materials Science and Technology , 2009 , 25 ( 2 ): 163 - 169 .
Davidson P A , He X , Lowe A J . Flow transitions in vacuum arc remelting [J]. Materials Science and Technology , 2000 , 16 ( 6 ): 699 - 711 .
Mitchell A . Progress in understanding clean metal production for IN718 [C]. Superalloys 718, 625, 706 and Various Derivatives (1994) . 1994 : 109 - 123 .
Campbell J . A future for vacuum arc remelting and electroslag remelting—a critical perspective [J]. Metals , 2023 , 13 ( 10 ): 1634 .