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Thermodynamic and Physical Properties of CaF2–(Al2O3–TiO2–MgO) System Slags for Electroslag Remelting of Inconel 18 Alloy

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Physicochemical properties (viscosity, electrical conductivity, melting point, thermodynamic activity of oxygen) of (10 – 70)CaF2 – (0 – 60)Al2O3 – (0 – 30)TiO2 – (0 – 30)MgO slags system are studied. The required content of titanium in the Inconel 718 (0.65–1.15%) can be provided with the studied slags (49CaF2 – 30Al2O3 – 21TiO2 and 50CaF2 – 22Al2O3 – 18TiO2 – 10MgO) even if they contain 0.5 – 2% SiO2. The aluminum content can be adjusted by adding or pre–increasing its content in the remelting electrode. With temperature growth from 1500 to 2500 K, the equilibrium content of Ti in the metal decreases, and of Al – vice versa. The content of titanium at the initial level (1%) in the molten metal is provided at a temperature of 1700 K with 50CaF2 – 22Al2O3 – 18TiO2 – MgO slag. In comparison with 70CaF2 – 15Al2O3 – 15CaO slag, widely used for superalloy remelting, the studied compositions 49CaF2 – 30Al2O3 – 21TiO2, and 50CaF2 – 22Al2O3 – 18TiO2 – 10MgO will increase environmental friendliness of the remelting as a result of CaF2 content reduction by 20% at comparable values of crystallization temperature and conductivity.

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Authors and Affiliations

  1. Paton Institute of Electric Welding, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    G. P. Stovpchenko, L. O. Lisova, L. B. Medovar & I. O. Goncharov

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  1. G. P. Stovpchenko
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  2. L. O. Lisova
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  3. L. B. Medovar
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  4. I. O. Goncharov
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Correspondence to G. P. Stovpchenko.

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Translated from Fizyko–Khimichna Mekhanika Materialiv, Vol. 58, No. 4, pp. 63–72, July–August, 2022.

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Stovpchenko, G.P., Lisova, L.O., Medovar, L.B. et al. Thermodynamic and Physical Properties of CaF2–(Al2O3–TiO2–MgO) System Slags for Electroslag Remelting of Inconel 18 Alloy. Mater Sci 58, 494–504 (2023). https://doi.org/10.1007/s11003-023-00690-6

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