Abstract
Yield stresses of ferritic iron pre-deformed at 298 K and 213 K were compared under an identical dislocation density. The specimens pre-deformed at 213 K introduced uniformly distributed dislocations, while those at 298 K formed dislocation cell structure. After the pre-deformation, tensile tests and stress-relaxation tests were performed at room temperature. The specimens with uniformly distributed dislocations exhibited significantly lower yield stress and larger stress-relaxation than those with cell-structured dislocations even under almost same dislocation density. This result suggests that the uniformly distributed dislocations contain a large amount of mobile dislocations which can easily move at a low stress compared with the cell-structured dislocations.
| Original language | English |
|---|---|
| Pages (from-to) | 176-180 |
| Number of pages | 5 |
| Journal | Scripta Materialia |
| Volume | 177 |
| DOIs | |
| Publication status | Published - Mar 1 2020 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
Cite this
Effect of dislocation distribution on the yield stress in ferritic steel under identical dislocation density conditions. / Tanaka, Yuki; Masumura, Takuro; Tsuchiyama, Toshihiro; Takaki, Setsuo.
In: Scripta Materialia, Vol. 177, 01.03.2020, p. 176-180.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Effect of dislocation distribution on the yield stress in ferritic steel under identical dislocation density conditions
AU - Tanaka, Yuki
AU - Masumura, Takuro
AU - Tsuchiyama, Toshihiro
AU - Takaki, Setsuo
PY - 2020/3/1
Y1 - 2020/3/1
N2 - Yield stresses of ferritic iron pre-deformed at 298 K and 213 K were compared under an identical dislocation density. The specimens pre-deformed at 213 K introduced uniformly distributed dislocations, while those at 298 K formed dislocation cell structure. After the pre-deformation, tensile tests and stress-relaxation tests were performed at room temperature. The specimens with uniformly distributed dislocations exhibited significantly lower yield stress and larger stress-relaxation than those with cell-structured dislocations even under almost same dislocation density. This result suggests that the uniformly distributed dislocations contain a large amount of mobile dislocations which can easily move at a low stress compared with the cell-structured dislocations.
AB - Yield stresses of ferritic iron pre-deformed at 298 K and 213 K were compared under an identical dislocation density. The specimens pre-deformed at 213 K introduced uniformly distributed dislocations, while those at 298 K formed dislocation cell structure. After the pre-deformation, tensile tests and stress-relaxation tests were performed at room temperature. The specimens with uniformly distributed dislocations exhibited significantly lower yield stress and larger stress-relaxation than those with cell-structured dislocations even under almost same dislocation density. This result suggests that the uniformly distributed dislocations contain a large amount of mobile dislocations which can easily move at a low stress compared with the cell-structured dislocations.
UR - http://www.scopus.com/inward/record.url?scp=85074145353&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85074145353&partnerID=8YFLogxK
U2 - 10.1016/j.scriptamat.2019.10.018
DO - 10.1016/j.scriptamat.2019.10.018
M3 - Article
AN - SCOPUS:85074145353
VL - 177
SP - 176
EP - 180
JO - Scripta Materialia
JF - Scripta Materialia
SN - 1359-6462
ER -