Effect of plasma on nitriding of Fe-18Cr-9Ni alloy

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

Research output: Contribution to journalArticle

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Abstract

The plasma nitriding behaviour of Fe-18Cr-9Ni alloy was compared with gas nitriding. The alloy was nitrided under the following conditions: specimen temperature: 823 K, nitriding time: mainly 108 ks, total pressure: 0.4-0.7 kPa, mixture ratio of N2 and H2: 0.25, discharge voltage: 350-450 V, current: 0.8-1.1 A. Formation of a surface layer of iron nitrides was not observed. Formation of a homogeneous internal nitriding layer, consisting of small precipitates of CrN and the γ-phase matrix, was, however, noted. The lattice constant at the specimen surface was smaller than that at greater depth. This may have been because the sputtering effect decreased the dissolved nitrogen content at the specimen surface. The sputtering of iron nitrides at the specimen surface by the plasma was experimentally confirmed through γ′-Fe4N formation on Si beside an alloy specimen. The characteristics of the plasma nitriding mentioned above are discussed in relation to the sputtering.

Original languageEnglish
Pages (from-to)637-640
Number of pages4
JournalJournal of Materials Science
Volume27
Issue number3
DOIs
Publication statusPublished - Jan 1992

Fingerprint

nitriding
Nitriding
Plasmas
Sputtering
sputtering
Nitrides
nitrides
Iron
iron
Lattice constants
Precipitates
precipitates
surface layers
Nitrogen
Gases
nitrogen
Electric potential
electric potential
matrices
gases

ASJC Scopus subject areas

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

Cite this

Kuwahara, H., Matsuoka, H., Tamura, I., Takada, J., Kikuchi, S., & Tomii, Y. (1992). Effect of plasma on nitriding of Fe-18Cr-9Ni alloy. Journal of Materials Science, 27(3), 637-640. https://doi.org/10.1007/BF00554028

Effect of plasma on nitriding of Fe-18Cr-9Ni alloy. / Kuwahara, H.; Matsuoka, H.; Tamura, I.; Takada, J.; Kikuchi, S.; Tomii, Y.

In: Journal of Materials Science, Vol. 27, No. 3, 01.1992, p. 637-640.

Research output: Contribution to journalArticle

Kuwahara, H, Matsuoka, H, Tamura, I, Takada, J, Kikuchi, S & Tomii, Y 1992, 'Effect of plasma on nitriding of Fe-18Cr-9Ni alloy', Journal of Materials Science, vol. 27, no. 3, pp. 637-640. https://doi.org/10.1007/BF00554028
Kuwahara H, Matsuoka H, Tamura I, Takada J, Kikuchi S, Tomii Y. Effect of plasma on nitriding of Fe-18Cr-9Ni alloy. Journal of Materials Science. 1992 Jan;27(3):637-640. https://doi.org/10.1007/BF00554028
Kuwahara, H. ; Matsuoka, H. ; Tamura, I. ; Takada, J. ; Kikuchi, S. ; Tomii, Y. / Effect of plasma on nitriding of Fe-18Cr-9Ni alloy. In: Journal of Materials Science. 1992 ; Vol. 27, No. 3. pp. 637-640.
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N2 - The plasma nitriding behaviour of Fe-18Cr-9Ni alloy was compared with gas nitriding. The alloy was nitrided under the following conditions: specimen temperature: 823 K, nitriding time: mainly 108 ks, total pressure: 0.4-0.7 kPa, mixture ratio of N2 and H2: 0.25, discharge voltage: 350-450 V, current: 0.8-1.1 A. Formation of a surface layer of iron nitrides was not observed. Formation of a homogeneous internal nitriding layer, consisting of small precipitates of CrN and the γ-phase matrix, was, however, noted. The lattice constant at the specimen surface was smaller than that at greater depth. This may have been because the sputtering effect decreased the dissolved nitrogen content at the specimen surface. The sputtering of iron nitrides at the specimen surface by the plasma was experimentally confirmed through γ′-Fe4N formation on Si beside an alloy specimen. The characteristics of the plasma nitriding mentioned above are discussed in relation to the sputtering.

AB - The plasma nitriding behaviour of Fe-18Cr-9Ni alloy was compared with gas nitriding. The alloy was nitrided under the following conditions: specimen temperature: 823 K, nitriding time: mainly 108 ks, total pressure: 0.4-0.7 kPa, mixture ratio of N2 and H2: 0.25, discharge voltage: 350-450 V, current: 0.8-1.1 A. Formation of a surface layer of iron nitrides was not observed. Formation of a homogeneous internal nitriding layer, consisting of small precipitates of CrN and the γ-phase matrix, was, however, noted. The lattice constant at the specimen surface was smaller than that at greater depth. This may have been because the sputtering effect decreased the dissolved nitrogen content at the specimen surface. The sputtering of iron nitrides at the specimen surface by the plasma was experimentally confirmed through γ′-Fe4N formation on Si beside an alloy specimen. The characteristics of the plasma nitriding mentioned above are discussed in relation to the sputtering.

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