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Establishing Aluminum-Oxygen (Al-O) Equilibria in Liquid Iron at 1873 K: An Experimental Study and Thermodynamic Analysis

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Abstract

Aluminum-oxygen equilibria for varying concentration of aluminum (0.0008–23.35 wt pct) content have been established at 1873 K. The experiments were carried out in an inert (high-purity argon) atmosphere by melting pure electrolytic iron with master alloy of Fe-Al in an alumina crucible and equilibrating the Fe-Al-O melt at 1873 K for two hours. A two-stage heating method in an inert gas fusion absorptiometry and scanning electron microscopy-automated inclusion analysis (SEM-AIA) have been employed to estimate the insoluble oxygen content in the samples. Aluminum-oxygen equilibria have been established separately for the total and dissolved oxygen contents. Thermodynamic analysis has been carried out using higher order interaction parameters, namely, Wagner interaction parameter formalism (WIPF) truncated at 2nd order, Darken’s quadratic formalism, and the Cubic formalism. Among these formalisms, the experimental analysis has been found to be in good agreement with thermodynamic analysis based on Cubic formalism.

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Acknowledgments

The financial support for this study is provided by (1) Industrial Research and Consultancy Center (IRCC) IIT Bombay, Mumbai (Project No. RD/0518-IRCCSH0-011) and (2) Science and Engineering Research Board (SERB), Department of Science and Technology, Government of India (project no. CRG/2019/000086). The authors are highly thankful to Dr. Sujoy Hazra, Dr. Bhushan Rakshe, and Mr. Sukanta Sarkar—R&D, JSW Steel Limited, Dolvi Works for SEM-AIA analysis of samples. Technical help from Mr. Amit Joshi, Assistant Technical officer, Ferrous Process Lab IIT Bombay is also gratefully acknowledged.

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  1. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai, Maharashtra, 400076, India

    Mir Ishfaq & Manish M. Pande

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  1. Mir Ishfaq
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  2. Manish M. Pande
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Correspondence to Manish M. Pande.

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Ishfaq, M., Pande, M.M. Establishing Aluminum-Oxygen (Al-O) Equilibria in Liquid Iron at 1873 K: An Experimental Study and Thermodynamic Analysis. Metall Mater Trans B (2024). https://doi.org/10.1007/s11663-024-03054-w

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