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Metallurgical and Materials Transactions A

, Volume 31, Issue 1, pp 195–211 | Cite as

Microstructural and compositional evolution of compound layers during gaseous nitrocarburizing

  • Hong Du
  • Marcel A. J. Somers
  • John Agren
Article

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.

Keywords

Carbon Activity Material Transaction Cementite Compound Layer Compositional Evolution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2000

Authors and Affiliations

  • Hong Du
    • 1
  • Marcel A. J. Somers
    • 2
  • John Agren
    • 3
  1. 1.United Technologies Research CenterEast Hartford
  2. 2.Department of Manufacturing EngineeringThe Technical University of DenmarkLyngbyDenmark
  3. 3.the Department of Materials Science and EngineeringRoyal Institute of TechnologyStockholmSweden

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