Effect of dislocation distribution on the yield stress in ferritic steel under identical dislocation density conditions

Yuki Tanaka, Takuro Masumura, Toshihiro Tsuchiyama, Setsuo Takaki

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)176-180
Number of pages5
JournalScripta Materialia
Volume177
DOIs
Publication statusPublished - Mar 1 2020

Fingerprint

ferritic stainless steels
Ferritic steel
Tensile testing
stress relaxation
Stress relaxation
Yield stress
Ferrite
ferrites
steels
Iron
cells
Temperature
tensile tests
tensile stress
iron

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 journalArticle

@article{f9e4e2e4487f4c9e897053997d8c6993,
title = "Effect of dislocation distribution on the yield stress in ferritic steel under identical dislocation density conditions",
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.",
author = "Yuki Tanaka and Takuro Masumura and Toshihiro Tsuchiyama and Setsuo Takaki",
year = "2020",
month = "3",
day = "1",
doi = "10.1016/j.scriptamat.2019.10.018",
language = "English",
volume = "177",
pages = "176--180",
journal = "Scripta Materialia",
issn = "1359-6462",
publisher = "Elsevier Limited",

}

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 -