Plasma nitriding of Fe-18Cr-9Ni in the range of 723-823 K

H. Kuwahara, H. Matsuoka, J. Takada, S. Kikuchi, Y. Tomii, I. Tamura

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Abstract

To clarify the mechanism of plasma nitriding, we examined the optical microstructure, the hardness, the precipitation, and the concentration of dissolved nitrogen in Fe-18Cr-9Ni nitrided using plasma in the range of 723-823 K. Compared with ammonia-gas nitriding, the features of plasma nitriding are the formation of small chromium-nitride precipitates (CrN), the absence of an externally nitrided layer, the high concentration of dissolved nitrogen, and the high hardness (HV=1200). The diffusion coefficient of nitrogen in the present alloy was determined using the growth rate of the internally nitrided layer, based on calculations used in internal oxidation. Plasma- and gas-nitriding were also compared with respect to the growth rate of the nitrided layer.

Original languageEnglish
Pages (from-to)143-156
Number of pages14
JournalOxidation of Metals
Volume36
Issue number1-2
DOIs
Publication statusPublished - Aug 1991

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Keywords

  • CrN precipitates
  • Fe-18Cr-9Ni
  • kinetics
  • nitrogen diffusion
  • plasma nitriding

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Kuwahara, H., Matsuoka, H., Takada, J., Kikuchi, S., Tomii, Y., & Tamura, I. (1991). Plasma nitriding of Fe-18Cr-9Ni in the range of 723-823 K. Oxidation of Metals, 36(1-2), 143-156. https://doi.org/10.1007/BF00938459