Ion-nitriding behaviour of Fe-Ti alloys in the α-phase region

Hiroshi Miyamura, Jun Takada, Hideyuki Kuwahara, Shiomi Kikuchi

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The ion-nitriding behaviour of four iron alloys containing between 0.11 and 1.48 wt% titanium was investigated in the α-phase region to discuss kinetics of the growth of the nitriding layer. The ion-nitriding experiments have been made at 823 K. Two nitriding layers were observed: a thin surface layer which mainly consists of Fe4N; an internal nitriding layer beneath the surface layer, where the nitride formed was found to be TiN. The growth of the internal nitriding layer is controlled by a diffusion process of nitrogen in the matrix metal. The apparent diffusion coefficient of nitrogen in the nitriding layer, evaluated using the rate equation proposed for internal oxidation, increases linearly with the volume fraction of titanium nitride. Furthermore, by excluding the effect of the titanium nitride from the apparent diffusion coefficient, the diffusion coefficient of nitrogen in α-iron was calculated, being in good agreement with that reported so far. In addition, the increase in hardness in the internal nitriding layer has been discussed.

Original languageEnglish
Pages (from-to)2514-2518
Number of pages5
JournalJournal of Materials Science
Volume21
Issue number7
DOIs
Publication statusPublished - Jul 1986
Externally publishedYes

Fingerprint

nitriding
Nitriding
Ions
ions
Titanium nitride
Nitrogen
diffusion coefficient
titanium nitrides
nitrogen
surface layers
Internal oxidation
iron alloys
Iron alloys
Titanium
Nitrides
nitrides
Volume fraction
hardness
Iron
titanium

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)

Cite this

Miyamura, H., Takada, J., Kuwahara, H., & Kikuchi, S. (1986). Ion-nitriding behaviour of Fe-Ti alloys in the α-phase region. Journal of Materials Science, 21(7), 2514-2518. https://doi.org/10.1007/BF01114299

Ion-nitriding behaviour of Fe-Ti alloys in the α-phase region. / Miyamura, Hiroshi; Takada, Jun; Kuwahara, Hideyuki; Kikuchi, Shiomi.

In: Journal of Materials Science, Vol. 21, No. 7, 07.1986, p. 2514-2518.

Research output: Contribution to journalArticle

Miyamura, H, Takada, J, Kuwahara, H & Kikuchi, S 1986, 'Ion-nitriding behaviour of Fe-Ti alloys in the α-phase region', Journal of Materials Science, vol. 21, no. 7, pp. 2514-2518. https://doi.org/10.1007/BF01114299
Miyamura, Hiroshi ; Takada, Jun ; Kuwahara, Hideyuki ; Kikuchi, Shiomi. / Ion-nitriding behaviour of Fe-Ti alloys in the α-phase region. In: Journal of Materials Science. 1986 ; Vol. 21, No. 7. pp. 2514-2518.
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