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Oxidation growth stresses in an alumina-forming ferritic steel measured by creep deflection

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Abstract

Deflection tests have been used to estimate the stresses developed in the alumina layer formed during short-term oxidation of a Fe-22Cr-5Al-0.3Y Fecralloy steel at 1000°C. Elastic analysis of the deflecting specimen is inappropriate under these test conditions because of the low creep strength of the alloy. Accordingly, a recent creep analysis has been used in this work using currently determined creep properties of the alloy substrate. The results of the analysis show that for the thin oxides produced (<1 μm), the planar stress within the oxide layer is everywhere compressive. Average values are approximately 850 MPa after 0.5 hr oxidation but reduce to <200 MPa after 6.5 hr. These values are very much less than would be expected under conditions of elastic deformation.

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Authors and Affiliations

  1. Centre for Materials Measurement and Technology, National Physical Laboratory, TW11 0LW, Teddington, Middlesex, UK

    S. R. J. Saunders, D. D. Gohil & S. Osgerby

  2. School of Metallurgy and Materials, The University of Birmingham, B15 2TT, Birmingham, UK

    H. E. Evans

  3. Chinese Academy of Sciences, 110015, Shenyang, PR China

    M. Li

Authors
  1. S. R. J. Saunders
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  2. H. E. Evans
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  3. M. Li
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  4. D. D. Gohil
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  5. S. Osgerby
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Saunders, S.R.J., Evans, H.E., Li, M. et al. Oxidation growth stresses in an alumina-forming ferritic steel measured by creep deflection. Oxid Met 48, 189–200 (1997). https://doi.org/10.1007/BF01670498

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  • DOI: https://doi.org/10.1007/BF01670498

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