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The Mechanism of Phase Transformation in Thermally-Grown FeO Scale Formed on Pure-Fe in Air

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Abstract

The isothermal phase transformation behavior of thermally grown oxide scale of FeO, which was formed on Fe at 700 °C in air for 16 min, was investigated at 320, 450, 500, 520, and 560 °C in air. The phase transformation of FeO was found to consist of four transformation modes: (1) growth of outer Fe3O4 layer; (2) precipitation of Fe3O4; (3) formation of magnetite seam; and (4) eutectoid decomposition of FeO. The transformation was always completed by the eutectoid decomposition at all temperatures in the present study; however, the proportion of transformation mode (1) and (2) strongly depended on temperature. At higher temperatures growth of the outer Fe3O4 layer initially predominates, but the precipitation of Fe3O4 controls the initial transformation at lower temperature before the eutectoid reaction. The eutectoid reaction was found to be initiated by Fe nucleation from Fe-saturated FeO. Fe saturation in FeO was due to growth and/or precipitation of Fe3O4 and formation of the magnetite seam layer, which acts as a diffusion barrier for Fe inward diffusion into Fe substrate. It was proposed that these transformation modes, growth and/or precipitation of Fe3O4 and magnetite seam formation, are necessary to begin the eutectoid reaction, i.e., completion of FeO scale transformation.

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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

    Shigenari Hayashi, Kouhei Mizumoto, Suzue Yoneda & Shigeharu Ukai

  2. Kimitsu R&D Lab, Technical Development Bureau, Nippon Steel & Sumitomo Metal Corp., Futtsu, 299-1141, Japan

    Yasumitsu Kondo & Hiroshi Tanei

Authors
  1. Shigenari Hayashi
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  2. Kouhei Mizumoto
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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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Hayashi, S., Mizumoto, K., Yoneda, S. et al. The Mechanism of Phase Transformation in Thermally-Grown FeO Scale Formed on Pure-Fe in Air. Oxid Met 81, 357–371 (2014). https://doi.org/10.1007/s11085-013-9442-7

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  • DOI: https://doi.org/10.1007/s11085-013-9442-7

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