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Aluminum Deoxidation Equilibria in Liquid Iron: Part III—Experiments and Thermodynamic Modeling of the Fe-Mn-Al-O System

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Abstract

Deoxidation equilibria in high-Mn- and high-Al-alloyed liquid steels were studied over the entire Fe-Mn-Al composition range by both experiments and thermodynamic modeling. Effect of Mn on the Al deoxidation equilibria in liquid iron was measured by the different experimental techniques depending on the Al content. In order to confirm the reproducibility of the experimental results, the deoxidation experiments were carried out reversibly from high oxygen state by addition of Al as a deoxidizer, and from low oxygen state by addition of Fe2O3 or MnO as an oxygen source. For the Al-rich side, CaO flux was added on top of liquid iron in order to remove suspended Al2O3 inclusions in the melt. Based on the present experimental result and available critically evaluated literature data, the Al deoxidation equilibria in Fe-Mn-Al-O liquid alloy were thermodynamically modeled. The Modified Quasichemical Model was used in order to take into account a strong short-range ordering of atoms in molten state. Deoxidation equilibria and inclusion stability diagram for entire Fe-Mn-Al melt were successfully reproduced by the present model.

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Notes

  1. Kim and one of the present authors (YBK) recently reported a thermodynamic optimization in the Fe-Mn-Al system[18] using the same thermodynamic modeling approach where they used a revised version of ΔgAlMn without any ternary parameter for the liquid phase, in order to obtain good agreement with alloy phase equilibria in the Fe-Mn-Al-C system.[19] Nevertheless, the deoxidation equilibria reported in the present study were not affected by the choice of ΔgAlMn and the ternary parameter.

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Acknowledgment

This study was supported by the R&D Center for Valuable Recycling (Global-Top Environmental Technology Development Program) funded by the Ministry of Environment (Project No.: 11-C22-ID).

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  1. Min-Kyu Paek (Postdoctoral Fellow)

    Present address: Department of Mining and Materials Engineering, McGill University, Montreal, QC, H3A 0C5, Canada

Authors and Affiliations

  1. Department of Mining and Materials Engineering, McGill University, Montreal, QC, H3A 0C5, Canada

    In-Ho Jung (Associate Professor)

  2. Department of Materials Engineering, Hanyang University, Ansan, 426-791, Korea

    Kyung-Hyo Do (Graduate Student) & Jong-Jin Pak (Professor)

  3. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Youn-Bae Kang (Associate Professor)

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  1. Min-Kyu Paek
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Correspondence to Jong-Jin Pak.

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Manuscript submitted December 27, 2015.

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Paek, MK., Do, KH., Kang, YB. et al. Aluminum Deoxidation Equilibria in Liquid Iron: Part III—Experiments and Thermodynamic Modeling of the Fe-Mn-Al-O System. Metall Mater Trans B 47, 2837–2847 (2016). https://doi.org/10.1007/s11663-016-0728-4

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