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Inherent oxidation protection of Fe-5Cr-15Ni-2Si-4.5Mo

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Abstract

The oxidation mechanism of Fe-5Cr-15Ni-2Si-4.5Mo alloy was investigated in order to determine the role of Si and Mo in providing oxidation resistance. It was determined that the oxidation protection in the temperature range 750–950°C resulted from formation of a continuous oxide sublayer of SiO 2 (or possibly Fe 2 SiO 4).Molybdenum formed an intermetallic Fe 2 Mo 1−x Si x that eventually diffused out into the grain boundaries and formed a protective barrier to the oxidation process. The mechanism behind the improved oxidation is the formation of a SiO 2 layer at the metal-oxide interface that retards the outward diffusion of Fe. It was also established that the oxidation mechanism was controlled by an activation energy equal to that of Fe 3+ ions diffusing through SiO 2.

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Authors and Affiliations

  1. U.S. Department of the Interior, Albany Research Center, Bureau of Mines, Albany, Oregon

    J. C. Rawers

  2. Oregon State University, Corvallis, Oregon

    J. C. Rawers

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  1. J. C. Rawers
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Rawers, J.C. Inherent oxidation protection of Fe-5Cr-15Ni-2Si-4.5Mo. Oxid Met 28, 183–194 (1987). https://doi.org/10.1007/BF00656706

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  • DOI: https://doi.org/10.1007/BF00656706

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