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Aluminum Deoxidation Equilibria in Liquid Iron: Part I. Experimental

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Abstract

In order to provide accurate information for refining of steel containing more than 1 mass pct Al, previously known information about Al deoxidation equilibria in liquid iron was critically reviewed. New Al deoxidation equilibria, Al and O contents in liquid iron in equilibrium with solid Al2O3 were measured at 1873 K and 1923 K (1600 °C and 1650 °C) over the whole Al composition range, 0.0027 < [pct Al] < 100. In order to secure the deoxidation equilibria, in the present study, the Al deoxidation experiments were carried out by employing three different methods: (1) traditional Al deoxidation by the addition of Al into Fe-O alloys, (2) oxidation of Al in Fe-Al alloys by the addition of Fe2O3 as an oxygen source, and (3) addition of CaO flux for an effective removal of suspended Al2O3 inclusions in liquid alloys containing high Al. In addition, in the present study, the O solubility limit in pure Al melt in equilibrium with solid Al2O3 was also measured in the temperature range from 1673 K to 1873 K (1400 °C to 1600 °C). The present experimental results provide a complete set of Al deoxidation equilibria in liquid iron which may be useful for the estimation of residual oxygen level and alumina inclusion formation in high Al steel processing. Interaction parameter formalism, which was originally proposed by Wagner and Chipman and has been widely used to interpret the Al deoxidation equilibria in liquid iron, was found to be inapplicable. Limitation of the interaction parameter formalism at high Al content in liquid Fe was discussed.

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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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Authors and Affiliations

  1. Department of Materials Engineering, Hanyang University, ERICA, Ansan, 426-791, Republic of Korea

    Min-Kyu Paek (Graduate Student, Post-Doctor), Jung-Mock Jang (Graduate Student) & Jong-Jin Pak (Professor)

  2. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, Kyungbuk, 790-784, Republic of Korea

    Youn-Bae Kang (Associate Professor)

  3. Department of Mining and Materials Engineering, McGill University, Montreal, QC, H3A 2B2, Canada

    Min-Kyu Paek (Graduate Student, Post-Doctor)

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  1. Min-Kyu Paek
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  2. Jung-Mock Jang
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  3. Youn-Bae Kang
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  4. Jong-Jin Pak
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Correspondence to Jong-Jin Pak.

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Manuscript submitted November 19, 2014.

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Paek, MK., Jang, JM., Kang, YB. et al. Aluminum Deoxidation Equilibria in Liquid Iron: Part I. Experimental. Metall Mater Trans B 46, 1826–1836 (2015). https://doi.org/10.1007/s11663-015-0368-0

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