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Thermal anti-oxidation treatment of CrNi-steels as studied by EXAFS in reflection mode: the influence of monosilane additions in the gas atmosphere of a continuous annealing furnace

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Abstract

Surface sensitive, reflection mode EXAFS spectroscopy at the Cr and Fe K-edges was used to study the surfaces of stainless steel (EU alloy grade 1.4301 X5CrNi18-10) after different heat treatments. The thermal treatments were performed in a conveyor belt furnace at temperatures between 600 and 900 °C in different gas atmospheres containing inert carrier gases (N2 or Ar) and different additives such as hydrogen (H2) and monosilane (SiH4). The ex-situ EXAFS results show that the iron and chromium in the steel can only be reduced to a metallic state, if SiH4 was used as a reducing additive for temperatures of 900 °C. Lower temperatures and process atmospheres without silane always result in strongly oxidized steel surfaces.

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Acknowledgements

We would like to thank André Langohr and Felix Weber for the steel sample preparations. This study was financially supported by the MWF NRW. The authors gratefully acknowledge the DELTA machine group for providing reliably synchrotron radiation. We would like to thank S. Balk for his help with the measurements at the beamline.

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Authors and Affiliations

  1. Fachbereich C–Physik, Bergische Universität Wuppertal, Gaußstr. 20, 42097, Wuppertal, Germany

    D. Lützenkirchen-Hecht, R. Wagner & R. Frahm

  2. Institut für Werkstoffkunde, Leibniz Universität Hannover, An der Universität 2, 30823, Garbsen, Germany

    D. Wulff, U. Holländer & H. J. Maier

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  1. D. Lützenkirchen-Hecht
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  2. D. Wulff
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  3. R. Wagner
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  4. R. Frahm
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  5. U. Holländer
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  6. H. J. Maier
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Correspondence to D. Lützenkirchen-Hecht.

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Lützenkirchen-Hecht, D., Wulff, D., Wagner, R. et al. Thermal anti-oxidation treatment of CrNi-steels as studied by EXAFS in reflection mode: the influence of monosilane additions in the gas atmosphere of a continuous annealing furnace. J Mater Sci 49, 5454–5461 (2014). https://doi.org/10.1007/s10853-014-8257-5

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