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Microstructural and compositional evolution of compound layers during gaseous nitrocarburizing

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An Erratum to this article was published on 01 March 2000

Abstract

Compound layers developed at 848 K during gaseous nitrocarburizing of iron and iron-carbon specimens were investigated for several combinations of N and C activities imposed at the specimen surface by gas mixtures of NH3, N2, CO2, and CO. The microstructural evolution of the compound layer was studied by light microscopy and by X-ray diffraction analysis. Composition-depth profiles were determined by electron probe (X-ray) microanalysis. Layer growth kinetics was investigated by layer thickness measurements. The influence of the N and C activities on the microstructural and compositional evolution and the growth kinetics of the compound layers formed is discussed for the iron substrate. The results indicate that the microstructure is governed by a fast C and a slow N absorption at the surface in an early stage of gaseous nitrocarburizing. The influence of carbon in the substrate on the microstructural and compositional evolutions and on the growth kinetics was evaluated from comparing the results obtained for a normalized Fe-0.8C alloy with those for iron under identical nitrocarburizing conditions.

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Author notes

  1. Marcel A. J. Somers (Assistant Professor, Professor of Metallurgy)

    Present address: Laboratory of Materials Science, Delft University of Technology, NL-2628, AL Delft, The Netherlands

  2. Hong Du Ph.D. Student, Research Engineer

    Present address: the Department of Materials Science and Engineering, Royal Institute of Technology, S-10044, Stockholm, Sweden

Authors and Affiliations

  1. United Technologies Research Center, 06108, East Hartford, CT

    Hong Du Ph.D. Student, Research Engineer

  2. Department of Manufacturing Engineering, The Technical University of Denmark, DK-2800, Lyngby, Denmark

    Marcel A. J. Somers (Assistant Professor, Professor of Metallurgy)

  3. the Department of Materials Science and Engineering, Royal Institute of Technology, S-10044, Stockholm, Sweden

    John Agren (Professor of Physical Metallurgy)

Authors
  1. Hong Du Ph.D. Student, Research Engineer
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  2. Marcel A. J. Somers
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  3. John Agren
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Additional information

An erratum to this article is available at http://dx.doi.org/10.1007/s11661-000-0023-4.

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Du, H., Somers, M.A.J. & Agren, J. Microstructural and compositional evolution of compound layers during gaseous nitrocarburizing. Metall Mater Trans A 31, 195–211 (2000). https://doi.org/10.1007/s11661-000-0065-7

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  • DOI: https://doi.org/10.1007/s11661-000-0065-7

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