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
N1 - Publisher Copyright:
© 2019 Acta Materialia Inc.
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.
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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 -