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Thermodynamic Analysis of the Deoxidation Ability of Alkaline-Earth Metals in the Presence of Aluminum

  • THEORY OF METALLURGICAL PROCESSES
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Abstract

The phase boundaries in the Fe–Mg–Al–O, Fe–Ca–Al–O, Fe–Sr–Al–O, and Fe–Ba–Al–O systems at 1600°C are determined using the theory of construction of solubility surfaces of components in a metal. The equilibrium constants of the formation of alkaline-metal aluminates from the components of a metallic melt are estimated. The compositions of the nonmetallic inclusions formed upon melt deoxidation and equilibrated with liquid iron are determined. A complex mechanism of deoxidation with the formation of oxide compounds containing aluminum and alkaline-earth metal is found to take place in all systems at 0.01 wt % aluminum dissolved in a metallic melt and an alkaline-earth metal concentration of 0.001 wt %. The deoxidation ability curves of the alkaline-earth metals are constructed for a fixed aluminum concentration [Al] = 0.01 wt %.

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Authors and Affiliations

  1. South Ural State University (National Research University), 454080, Chelyabinsk, Russia

    L. A. Makrovets, O. V. Samoilova & G. G. Mikhailov

  2. OOO NPP Tekhnologiya, 454901, Chelyabinsk, Russia

    I. V. Bakin

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  1. L. A. Makrovets
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  2. O. V. Samoilova
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  3. I. V. Bakin
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  4. G. G. Mikhailov
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Correspondence to L. A. Makrovets.

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Translated by E. Yablonskaya

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Makrovets, L.A., Samoilova, O.V., Bakin, I.V. et al. Thermodynamic Analysis of the Deoxidation Ability of Alkaline-Earth Metals in the Presence of Aluminum. Russ. Metall. 2022, 575–582 (2022). https://doi.org/10.1134/S0036029522060180

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