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Mechanism of Magnetite Seam Formation and its Role for FeO Scale Transformation

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Abstract

The phase transformation behavior of a thermally grown oxide scale of FeO on pure-Fe and an Fe–2wt%Au alloy was investigated. Particular attention was paid to formation of a magnetite seam, which is the Fe3O4 layer formed at the FeO/alloy interface at an initial stage of the phase transformation, since it has important effects on the overall phase transformation of FeO scale. A thin Au(Fe) layer was found to develop on the Fe–Au alloy at the FeO/alloy interface after 32 min of oxidation at 750 °C in air. This Au(Fe) layer prevented formation of a magnetite seam and accelerated the FeO eutectoid reaction. The Au(Fe) layer acted as a “chemical diffusion barrier” for inward diffusion of Fe from the FeO to the alloy substrate across the FeO/alloy interface and prevented magnetite seam formation.

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Acknowledgments

The authors are grateful to Dr. S. Ford at BlueScope for his comments and fruitful discussion.

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Authors and Affiliations

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

    Yuta Shizukawa, Shigenari Hayashi, Suzue Yoneda & Shigeharu Ukai

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

    Yasumitsu Kondo & Hiroshi Tanei

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

    Shigenari Hayashi & Suzue Yoneda

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

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Shizukawa, Y., Hayashi, S., Yoneda, S. et al. Mechanism of Magnetite Seam Formation and its Role for FeO Scale Transformation. Oxid Met 86, 315–326 (2016). https://doi.org/10.1007/s11085-016-9638-8

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  • DOI: https://doi.org/10.1007/s11085-016-9638-8

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