The brittle-to-ductile transition in severely deformed low carbon steel

Masaki Tanaka, Kenji Higashida, Tomotsugu Shimokawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The brittle-to-duetile transition (BDT) behaviour was investigated in low carbon steel deformed by an accumulative roll-bonding (ARB) process. The temperature dependence of fracture toughness was measured by conducting four-point bending tests at various 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 BDT did not change due to the deformation with the ARB process. It indicated that the decrease in the BDT temperature by grain refining was not due to the reduction in the dislocation mobility with respect to short-range barriers. Quasi-three-dimensional simulations of discrete dislocation dynamics indicated that the decrease in the number of dislocation sources decreases in the BDT temperature. The roles of grain boundaries will be also discussed in order to explain the decrease in the BDT temperature.

Original languageEnglish
Title of host publicationTMS 2010 - 139th Annual Meeting and Exhibition - Supplemental Proceedings
Pages787-794
Number of pages8
Publication statusPublished - May 28 2010
EventTMS 2010 - 139th Annual Meeting and Exhibition - Seattle, WA, United States
Duration: Feb 14 2010Feb 18 2010

Publication series

NameTMS Annual Meeting
Volume2

Other

OtherTMS 2010 - 139th Annual Meeting and Exhibition
CountryUnited States
CitySeattle, WA
Period2/14/102/18/10

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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  • Cite this

    Tanaka, M., Higashida, K., & Shimokawa, T. (2010). The brittle-to-ductile transition in severely deformed low carbon steel. In TMS 2010 - 139th Annual Meeting and Exhibition - Supplemental Proceedings (pp. 787-794). (TMS Annual Meeting; Vol. 2).