The effect of severe plastic deformation on the brittle-ductile transition in low carbon steel

Masaki Tanaka, Kenji Higashida, Tomotsugu Shimokawa

研究成果: 著書/レポートタイプへの貢献

2 引用 (Scopus)

抄録

Brittle-ductile transition (BDT) behaviour was investigated in low carbon steel deformed by an accumulative roll-bonding (ARB) process. The temperature dependence of its fracture toughness was measured by conducting four-point bending tests at various temperatures and strain rates. The fracture toughness increased while the BDT temperature decreased in the specimens deformed by the ARB process. Arrhenius plots between the BDT temperatures and the strain rates indicated that the activation energy for the controlling process of the BDT was not changed by the deformation with the ARB process. It was deduced that the decrease in the BDT temperature by grain refining was not due to the increase in the dislocation mobility controlled by short-range barriers. Quasi-three-dimensional simulations of dislocation dynamics, taking into account of crack tip shielding due to dislocations, were performed to investigate the effect of a dislocation source spacing along a crack front on the BDT. The simulation indicated that the BDT temperature is decreased with decreasing in the dislocation source spacing. Molecular dynamics simulations revealed that moving dislocations were impinged against grain boundaries and were reemitted from there with increasing strain. It indicates that grain boundaries can be new sources in ultra-fine grained materials, which increases toughness at low temperatures.

元の言語英語
ホスト出版物のタイトルDuctility of Bulk Nanostructured Materials
出版者Trans Tech Publications Ltd
ページ471-480
ページ数10
ISBN(印刷物)0878493050, 9780878493050
DOI
出版物ステータス出版済み - 1 1 2010

出版物シリーズ

名前Materials Science Forum
633-634
ISSN(印刷物)0255-5476

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Roll bonding
ductile-brittle transition
low carbon steels
Low carbon steel
Superconducting transition temperature
plastic deformation
Plastic deformation
Fracture toughness
Strain rate
Grain boundaries
transition temperature
Arrhenius plots
Bending tests
Dislocations (crystals)
Crack tips
Shielding
Temperature
Refining
Toughness
Molecular dynamics

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

これを引用

Tanaka, M., Higashida, K., & Shimokawa, T. (2010). The effect of severe plastic deformation on the brittle-ductile transition in low carbon steel. : Ductility of Bulk Nanostructured Materials (pp. 471-480). (Materials Science Forum; 巻数 633-634). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/MSF.633-634.471

The effect of severe plastic deformation on the brittle-ductile transition in low carbon steel. / Tanaka, Masaki; Higashida, Kenji; Shimokawa, Tomotsugu.

Ductility of Bulk Nanostructured Materials. Trans Tech Publications Ltd, 2010. p. 471-480 (Materials Science Forum; 巻 633-634).

研究成果: 著書/レポートタイプへの貢献

Tanaka, M, Higashida, K & Shimokawa, T 2010, The effect of severe plastic deformation on the brittle-ductile transition in low carbon steel. : Ductility of Bulk Nanostructured Materials. Materials Science Forum, 巻. 633-634, Trans Tech Publications Ltd, pp. 471-480. https://doi.org/10.4028/www.scientific.net/MSF.633-634.471
Tanaka M, Higashida K, Shimokawa T. The effect of severe plastic deformation on the brittle-ductile transition in low carbon steel. : Ductility of Bulk Nanostructured Materials. Trans Tech Publications Ltd. 2010. p. 471-480. (Materials Science Forum). https://doi.org/10.4028/www.scientific.net/MSF.633-634.471
Tanaka, Masaki ; Higashida, Kenji ; Shimokawa, Tomotsugu. / The effect of severe plastic deformation on the brittle-ductile transition in low carbon steel. Ductility of Bulk Nanostructured Materials. Trans Tech Publications Ltd, 2010. pp. 471-480 (Materials Science Forum).
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