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The Initial Oxide Scale Development on a Model FeNiCrAl Alloy at 900 °C in Dry and Humid Atmosphere: A Detailed Investigation

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Abstract

The investigated alumina forming FeNiCrAl model alloy shows protective oxidation behavior in dry and humid environment at 900 °C. Hence, this type of alloy may replace conventional chromia forming austenitic alloys in aggressive oxidizing/reducing environments. A detailed investigation of the oxide scale development reveals a complex initial scale development. Firstly, at alloy grain boundaries, a thin Al rich oxide forms which is replaced by transient alumina platelets in dry and equiaxed α-Al2O3 crystallites in humid atmosphere. The scale at alloy grain centers develops via a layered scale of external chromia:Fe/Ni metal inclusions:internal alumina to a layered external spinel:internal alumina scale in dry atmosphere. In humid condition an additional oxide feature appears on the center of large alloy grains i.e. thick oxide protrusions. Despite the initially different phase compositions a continuous protective α-Al2O3 scale forms both atmospheres.

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Authors and Affiliations

  1. Environmental Inorganic Chemistry, Chalmers University of Technology, 412 96, Göteborg, Sweden

    J. Hall, K. Hellström, J.-E. Svensson & L.-G. Johansson

  2. Materials and Manufacturing Technology, Chalmers University of Technology, 412 96, Göteborg, Sweden

    M. Norell

  3. Sandvik Materials Technology, 811 81, Sandviken, Sweden

    M. Lundberg

  4. Sandvik Materials Technology, 734 27, Hallstahammar, Sweden

    T. Helander

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  1. J. Hall
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  2. K. Hellström
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  3. J.-E. Svensson
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  4. M. Norell
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  5. M. Lundberg
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  6. T. Helander
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  7. L.-G. Johansson
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Correspondence to J. Hall.

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Hall, J., Hellström, K., Svensson, JE. et al. The Initial Oxide Scale Development on a Model FeNiCrAl Alloy at 900 °C in Dry and Humid Atmosphere: A Detailed Investigation. Oxid Met 82, 225–247 (2014). https://doi.org/10.1007/s11085-014-9489-0

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  • DOI: https://doi.org/10.1007/s11085-014-9489-0

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