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Microstructural investigation of the oxidation of an Fe-3 pct Cr alloy

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Abstract

The microstructure and microchemistry of the oxide scale on an Fe-3 wt pct Cr alloy have been investigated after oxidation in the temperature range 700 to 800 °C. Transmission and scanning electron microscopy along with energy dispersive X-ray analysis and Auger electron spectroscopy techniques were used for the investigation. Multilayered scales are observed which vary in composition and structure; the innermost oxide is an Fe-Cr spinel of the type Fe(Fe2•xCrx)O4. The intermediate layer and the outer oxide layer are both α-Fe2O3 hematite. The outer hematite layer is nonadherent and wrinkling is observed. Spallation occurs readily at the inner hematiteJspinel interface and at the spinel oxideJalloy interface. The poor oxidation resistance of the alloy is discussed in terms of these observations.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, Case Western Reserve University, 44106, Cleveland, OH

    P. A. Labun, J. Covington, K. Kuroda, G. Welsch & T. E. Mitchell

Authors
  1. P. A. Labun
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  2. J. Covington
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  3. K. Kuroda
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  4. G. Welsch
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  5. T. E. Mitchell
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Labun, P.A., Covington, J., Kuroda, K. et al. Microstructural investigation of the oxidation of an Fe-3 pct Cr alloy. Metall Trans A 13, 2103–2112 (1982). https://doi.org/10.1007/BF02648380

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  • DOI: https://doi.org/10.1007/BF02648380

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