Ion-nitriding of an Fe-19 wt % Cr alloy

Jun Takada, Yuusuke Ohizumi, Hiroshi Miyamura, Hideyuki Kuwahara, Shiomi Kikuchi, Imao Tamura

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43 Citations (Scopus)


The ion-nitriding behaviour of an Fe-18.75wt% Cr alloy was investigated at 803 K under constant plasma conditions. Both a thin surface layer of γ′-Fe4N and an internal-nitriding layer were observed. The nitride formed in the internal-nitriding layer was found to be CrN, rather than Cr2N. The hardness of the nitriding layer rises to Hv=1200 due to small CrN precipitates. The growth rate of the internal nitriding layer, in the present alloy is controlled by a nitrogen diffusion process in the matrix metal, α-iron. Because such ion-nitriding behaviour is analogous to that of internal-oxidation, the growth rate of nitriding was discussed according to the rate equation to that of internal-oxidation. The nitrogen diffusion in the present alloy is scarcely affected by the CrN precipitates.

Original languageEnglish
Pages (from-to)2493-2496
Number of pages4
JournalJournal of Materials Science
Issue number7
Publication statusPublished - Jul 1 1986

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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