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Aluminum-Titanium Complex Deoxidation Equilibria in Fe-Cr-Al-Ti-O Melts

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Abstract

Al-Ti complex deoxidation equilibria in high Cr stainless steels were studied by measuring the thermodynamic behavior of O in the Fe-Cr-Al-O, Fe-Cr-Ti-O, and Fe-Cr-Al-Ti-O melts. The present deoxidation experiments were thermodynamically analyzed along with available data in the literature using Wagner’s formalism. The compatible set of parameters for the multicomponent Fe-Cr-Al-Ti-O system was selected, and its applicable concentration and temperature limits were discussed. The parameter set successfully reproduced the present experimental results and literature data of deoxidation equilibria in the Fe-Cr-Al-O and Fe-Cr-Ti-O alloy melts over the wide Cr concentration up to 40 mass pct at 1823 K to 1996 K (1550 °C to 1723 °C). The validity of the parameters was also checked by carrying out the Al-Ti complex deoxidation experiments with the construction of the predominance diagram for inclusions in the Fe-Cr-Al-Ti-O melts at 1873 K (1600 °C).

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Acknowledgment

This work was supported by the Brain Korea 21 Plus Project in Education Program of Advanced Materials and Processing Technologies for Conventional Industries (22A20130012792).

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Authors and Affiliations

  1. Department of Chemical and Metallurgical Engineering, Aalto University, 02150, Espoo, Finland

    Min-Kyu Paek & Lauri Holappa

  2. Steelmaking Research Group, Technical Research Lab., POSCO, Pohang, 37859, Korea

    Jung-Mock Jang

  3. R&D Center, Hyundai Steel Co. Ltd, Dangjin, 31719, Korea

    Jong-Oh Jo

  4. Department of Materials Science and Chemical Engineering, Hanyang University, ERICA, Ansan, 15588, Korea

    Jong-Jin Pak

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  1. Min-Kyu Paek
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  2. Jung-Mock Jang
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Correspondence to Jong-Jin Pak.

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Manuscript submitted 19 June, 2020; Accepted October 15, 2020.

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Paek, MK., Jang, JM., Jo, JO. et al. Aluminum-Titanium Complex Deoxidation Equilibria in Fe-Cr-Al-Ti-O Melts. Metall Mater Trans B 52, 236–244 (2021). https://doi.org/10.1007/s11663-020-02011-7

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  • DOI: https://doi.org/10.1007/s11663-020-02011-7

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