Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 1927-1933 |
| Number of pages | 7 |
| Journal | isij international |
| Volume | 58 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - Oct 2018 |
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All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry
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Effect of grain size on the yield stress of cold worked iron. / Tanaka, Yuki; Takaki, Setsuo; Tsuchiyama, Toshihiro; Uemori, Ryuji.
In: isij international, Vol. 58, No. 10, 10.2018, p. 1927-1933.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Effect of grain size on the yield stress of cold worked iron
AU - Tanaka, Yuki
AU - Takaki, Setsuo
AU - Tsuchiyama, Toshihiro
AU - Uemori, Ryuji
PY - 2018/10
Y1 - 2018/10
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=85055182621&partnerID=8YFLogxK
U2 - 10.2355/isijinternational.ISIJINT-2018-371
DO - 10.2355/isijinternational.ISIJINT-2018-371
M3 - Article
AN - SCOPUS:85055182621
VL - 58
SP - 1927
EP - 1933
JO - ISIJ International
JF - ISIJ International
SN - 0915-1559
IS - 10
ER -