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Differences between eastern and western-type nuclear reactor pressure vessel steels as probed by Mössbauer spectroscopy

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Abstract

Mössbauer spectra (MS) at room temperature have been collected for non-irradiated Eastern- and Western-type nuclear reactor pressure vessel (RPV) steels. All samples showed a typical Mössbauer spectrum for steels with a low alloy-element concentration. Analysis with distributed hyperfine parameters revealed that the spectra consist of two magnetically split subspectra and that only for the Western-type RPV steels a small doublet is present. The analysis of the resulting Hhf-distribution profiles showed that for the Eastern-type steels the relative area for the ''perturbed'' component is more pronounced, and that it has a more complex structure than the corresponding profile for the Western-type steels. The additional doublet present in the MS of the Western-type steels could be assigned to Mn and/or Cr-substituted cementite, while no carbide doublet was observed for the Eastern-type RPV steel, Cr23C6, Cr7C3 and VC being the principal carbides. The distinctions between the two types of steel are due to compositional differences. The results further show that Mössbauer spectroscopy is sensitive to small changes in composition and hence is capable of distinguishing between different types of steel.

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References

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Authors and Affiliations

  1. SCK-CEN, Reactor Materials Research, Boeretang 200, B-2400, Mol, Belgium

    P.M.A. de Bakker, E. van Walle & A. Fabry

  2. Department of Nuclear Physics and Technology FEI STU Bratislava, Ilkovicova 3, 81219, Bratislava, Slovak Republic

    V. Slugen

  3. Department of Subatomic and Radiation Physics, University of Gent, Proeftuinstraat 86, B-9000, Gent, Belgium

    E. De Grave

Authors
  1. P.M.A. de Bakker
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  2. V. Slugen
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  3. E. De Grave
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  4. E. van Walle
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  5. A. Fabry
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de Bakker, P., Slugen, V., De Grave, E. et al. Differences between eastern and western-type nuclear reactor pressure vessel steels as probed by Mössbauer spectroscopy. Hyperfine Interactions 110, 11–16 (1997). https://doi.org/10.1023/A:1012663013661

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  • DOI: https://doi.org/10.1023/A:1012663013661

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