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

Research output: Contribution to journalArticle

25 Citations (Scopus)

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 1 1991

Keywords

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

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Metals and Alloys
  • Materials Chemistry

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    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