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Formation and Thermodynamics of Mg-Al-Ti-O Complex Inclusions in Mg-Al-Ti-Deoxidized Steel

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Abstract

The formation of Mg-Al-Ti-O complex inclusions in steel was investigated by laboratory experiments and thermodynamic calculation. The composition evolutions of Mg-Al-Ti-O inclusions in steel with different contents of [Al], [Mg], and [Ti] were discussed. Mg-Al-Ti-O complex inclusion with high TiO x content was liquid at 1873 K (1600 °C), indicating MgAl2O4 spinel inclusions can be modified to low melting temperature ones by combining TiO x component. The stability diagram of Al-Mg-Ti-O system inclusions in the molten steel at 1873 K (1600 °C) was calculated, considering many kinds of oxide inclusions such as MgO, Al2O3, TiO x , MgTi2O4, MgAl2O4, Al2TiO5, and liquid inclusion. The thermodynamic calculations are in good agreement with experimental results, which can predict the formation of Al-Mg-Ti-O complex inclusions in molten steel with a large concentration range of [Al], [Mg], and [Ti].

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Acknowledgments

The authors are grateful for support from the National Science Foundation China (Grants 51274034, 51334002, and U1360201), Beijing Key Laboratory of Green Recycling and Extraction of Metals (GREM), the Laboratory of Green Process Metallurgy and Modeling (GPM2), and the High Quality Steel Consortium (HQSC) at the School of Metallurgical and Ecological Engineering at University of Science and Technology Beijing (USTB), China.

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  1. Beijing Key Laboratory of Green Recycling and Extraction of Metals (GREM) and the School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing (USTB), No. 30, Xueyuan Road, Haidian District, Beijing, 100083, P.R. China

    Ying Ren (Ph.D. Student), Lifeng Zhang (Professor), Wen Yang (Postdoctor) & Haojian Duan (Ph.D. Student)

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  1. Ying Ren
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  2. Lifeng Zhang
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Correspondence to Lifeng Zhang.

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Manuscript submitted January 24, 2014.

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Ren, Y., Zhang, L., Yang, W. et al. Formation and Thermodynamics of Mg-Al-Ti-O Complex Inclusions in Mg-Al-Ti-Deoxidized Steel. Metall Mater Trans B 45, 2057–2071 (2014). https://doi.org/10.1007/s11663-014-0121-0

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