Effect of grain size on the yield stress of cold worked iron

Yuki Tanaka, Setsuo Takaki, Toshihiro Tsuchiyama, Ryuji Uemori

研究成果: ジャーナルへの寄稿記事

3 引用 (Scopus)

抄録

Effect of ferrite grain size on dislocation strengthening was investigated in low carbon steels (0.006%C-0.15%C) with various grain sizes from 1 to 100 m. In specimens with slight deformation, dislocation density increases in proportion to the inverse of ferrite grain size. In the dislocation density range below 2×1014/m2, dislocation density increases linearly against deformation strain but it tends to level off due to the dynamic recovery of dislocations when dislocation density has exceeded it. On the other hand, tensile tests revealed that yield stress follows the Hall-Petch relation for as-annealed specimens but follows the Bailey-Hirsch relation for cold rolled specimens. This means that flow stress depends on only the dislocation density regardless of grain size. As a result, it was concluded that the introduction of dislocations has been promoted with decreasing ferrite grain size and this results in the increase of flow stress in the uniform deformation region.

元の言語英語
ページ(範囲)1927-1933
ページ数7
ジャーナルisij international
58
発行部数10
DOI
出版物ステータス出版済み - 10 2018

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Yield stress
Ferrite
Iron
Plastic flow
Strengthening (metal)
Low carbon steel
Recovery

All Science Journal Classification (ASJC) codes

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

これを引用

Effect of grain size on the yield stress of cold worked iron. / Tanaka, Yuki; Takaki, Setsuo; Tsuchiyama, Toshihiro; Uemori, Ryuji.

:: isij international, 巻 58, 番号 10, 10.2018, p. 1927-1933.

研究成果: ジャーナルへの寄稿記事

Tanaka, Yuki ; Takaki, Setsuo ; Tsuchiyama, Toshihiro ; Uemori, Ryuji. / Effect of grain size on the yield stress of cold worked iron. :: isij international. 2018 ; 巻 58, 番号 10. pp. 1927-1933.
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