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Oxidation of Sanicro 25 (42Fe22Cr25NiWCuNbN) in O2 and O2 + H2O Environments at 600–750 °C

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Abstract

The present study investigates the isothermal oxidation behaviour of Sanicro 25 (42Fe22Cr25NiWCuNbN) in dry and wet environments at 600–750 °C. GDOES, SEM, TEM and EDX were used as analytical techniques. The alloy formed a protective oxide when exposed in dry O2 (600–750 °C). When water vapour was present, the oxide exhibited protective behaviour only at 600 °C with breakaway occurring at 700 and 750 °C. Apparently, the chromium supply from the bulk was not able to counteract the increasing rate of chromium evaporation favoured by water vapour in the latter conditions and thus breakaway oxidation occurs.

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Acknowledgments

This work was carried out in collaboration with the Swedish High Temperature Corrosion (HTC) centre. The research leading to these results has received funding from the European Community’s Research Fund for Coal and Steel (RFCS) under AUSPLUS project Grant agreement n° [RFSR-CT-2010-00019]. A Grant from Knut and Alice Wallenberg Foundation for acquiring the FEG-SEM instrument is gratefully acknowledged.

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Authors and Affiliations

  1. Centro Sviluppo Materiali S.p.A, Via di Castel romano 100, 00128, Rome, Italy

    L. Intiso

  2. Department of Applied Physics, Chalmers University of Technology, 412 96, Göteborg, Sweden

    L. Intiso & M. Halvarsson

  3. High Temperature Corrosion Centre, Chalmers University of Technology, 412 96, Göteborg, Sweden

    L.-G. Johansson & J.-E. Svensson

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  1. L. Intiso
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  2. L.-G. Johansson
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  3. J.-E. Svensson
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  4. M. Halvarsson
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Correspondence to L. Intiso.

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Intiso, L., Johansson, LG., Svensson, JE. et al. Oxidation of Sanicro 25 (42Fe22Cr25NiWCuNbN) in O2 and O2 + H2O Environments at 600–750 °C. Oxid Met 83, 367–391 (2015). https://doi.org/10.1007/s11085-015-9528-5

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  • DOI: https://doi.org/10.1007/s11085-015-9528-5

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