Grain size effect on the nitrogen super-saturation process into AISI316 at 623 K

Tatsuhiko Aizawa, Tomoaki Yoshino, Tomomi Shiratori, Sho Ichiro Yoshihara

研究成果: Article

抄録

Coarse and fine grained AISI316 substrates were prepared to describe the grain size effect on the inner nitriding behavior at 623 K by using the high density plasma nitriding without precipitation of nitrides. In case of coarse grained AISI316, the nitriding process advanced homogeneously in one part of nitrided layer with high nitrogen content, and, heterogeneously in its other part. In the former, γ–α’ two-phase, fine microstructure was uniformly formed by the phase transformation and plastic straining with the nitrogen supersaturation. In the latter, the nitrogen super-saturation localized to selectively modify the coarse grains to form the transformed α’-phase zones with the plastically strained γ-phase ones, even below the nitriding front end of 30 μm. In case of fine-grained AISI316, the nitriding took place homogeneously to form fine, two-phase microstructure down to the nitriding front end of 40 μm. This difference in the inner nitriding behavior came from the synergetic relationship between the nitrogen diffusion and super-saturation processes.

元の言語English
ページ(範囲)1886-1892
ページ数7
ジャーナルISIJ International
59
発行部数10
DOI
出版物ステータスPublished - 2019 1 1

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Nitriding
Supersaturation
Nitrogen
Microstructure
Plasma density
Nitrides
Phase transitions
Plastics
Substrates

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

これを引用

Grain size effect on the nitrogen super-saturation process into AISI316 at 623 K. / Aizawa, Tatsuhiko; Yoshino, Tomoaki; Shiratori, Tomomi; Yoshihara, Sho Ichiro.

:: ISIJ International, 巻 59, 番号 10, 01.01.2019, p. 1886-1892.

研究成果: Article

Aizawa, Tatsuhiko ; Yoshino, Tomoaki ; Shiratori, Tomomi ; Yoshihara, Sho Ichiro. / Grain size effect on the nitrogen super-saturation process into AISI316 at 623 K. :: ISIJ International. 2019 ; 巻 59, 番号 10. pp. 1886-1892.
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AB - Coarse and fine grained AISI316 substrates were prepared to describe the grain size effect on the inner nitriding behavior at 623 K by using the high density plasma nitriding without precipitation of nitrides. In case of coarse grained AISI316, the nitriding process advanced homogeneously in one part of nitrided layer with high nitrogen content, and, heterogeneously in its other part. In the former, γ–α’ two-phase, fine microstructure was uniformly formed by the phase transformation and plastic straining with the nitrogen supersaturation. In the latter, the nitrogen super-saturation localized to selectively modify the coarse grains to form the transformed α’-phase zones with the plastically strained γ-phase ones, even below the nitriding front end of 30 μm. In case of fine-grained AISI316, the nitriding took place homogeneously to form fine, two-phase microstructure down to the nitriding front end of 40 μm. This difference in the inner nitriding behavior came from the synergetic relationship between the nitrogen diffusion and super-saturation processes.

KW - AISI316

KW - Diffusion path

KW - Initial grain size

KW - Microstructure refinement

KW - Nitrogen supersaturation

KW - Phase transformation

KW - Plasma nitriding

KW - Plastic straining

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