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Effect of Mn on Isothermal Transformation of Thermally Grown FeO Scale Formed on Fe–Mn Alloys

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Abstract

The effect of Mn addition on the phase transformation behavior of a thermally grown FeO scale formed on Fe–Mn alloys was investigated. The FeO layer contained Mn, and the Mn/Fe ratio in FeO was similar to that in the alloy substrate. Only 2 wt% Mn addition in the Fe substrate was found to delay significantly the overall transformation time, which includes magnetite (Fe3O4) seam formation, Fe3O4 precipitation, and eutectoid product formation. Decrease in the area fraction of eutectoid lamellar region in the oxide scale and increase in the lamellar spacing in the eutectoid structure after the phase transformation of a (Fe, Mn)O scale suggested that Mn addition decreases the driving force for the FeO decomposition via eutectoid reaction, i.e., extends the FeO phase region to lower temperature. 2 wt% Mn addition was estimated to decrease the eutectoid temperature of FeO about 40 °C, which agreed with the calculated Fe–Mn–O phase diagram.

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Acknowledgments

The authors appreciate Professor Brian Gleeson at University of Pittsburgh for providing the calculated Fe–Mn–O phase diagram.

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Author notes

  1. Suzue Yoneda & Shigenari Hayashi

    Present address: Department of Materials Science and Engineering, Tokyo Institute of Technology, 2-12-1-S8-3, Ookayama, Meguro-ku, Tokyo, 152-8552, Japan

Authors and Affiliations

  1. Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, N13, W8, Kitaku, Sapporo, 060-8628, Japan

    Suzue Yoneda, Shigenari Hayashi & Shigeharu Ukai

  2. Process Research Laboratories, Integrated Process R&D Division, Technical Research & Development Bureau, Nippon Steel & Sumitomo Metal Corporation, 20-1 Shintomi, Futtsu, Chiba, 293-8511, Japan

    Yasumitsu Kondo & Hiroshi Tanei

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  1. Suzue Yoneda
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  2. Shigenari Hayashi
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  3. Yasumitsu Kondo
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  4. Hiroshi Tanei
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  5. Shigeharu Ukai
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Correspondence to Shigenari Hayashi.

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Yoneda, S., Hayashi, S., Kondo, Y. et al. Effect of Mn on Isothermal Transformation of Thermally Grown FeO Scale Formed on Fe–Mn Alloys. Oxid Met 87, 125–138 (2017). https://doi.org/10.1007/s11085-016-9661-9

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  • DOI: https://doi.org/10.1007/s11085-016-9661-9

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