Enhancement of low temperature toughness in bulk nanostructured metals

Masaki Tanaka, Shunsaku Takano, Kenji Higashida

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Brittle-to-ductile transitions (BDT) in fine-grained Ti added ultra-low carbon steels were investigated. Temperature dependences of impact absorbed energy were measured using specimens with grain sizes of 0.4, 2, 9 and 70μm of which the grain sizes were controlled by heat treatments after five cycles of accumulative roll-bonding process. Although the BDT temperatures were decreased with the decrease in the grain size, the shape of BDT curves in fine-grained steels are different from those of coarse grains. Specimens with coarse grains show abrupt increase in the absorbed energy at the BDT temperature while fine-grained steels exhibit slight jump of absorbed energy at the BDT temperature and then the energy gradually increases with temperature, showing the enhancement of toughness at low temperatures in fine-grained steels. In the present paper, the characteristic BDT in fine-grained steels was discussed in terms of the thermally activated process of dislocation glide.

Original languageEnglish
Pages (from-to)1624-1628
Number of pages5
JournalMaterials Transactions
Volume54
Issue number9
DOIs
Publication statusPublished - Sep 4 2013

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Steel
toughness
Toughness
Metals
steels
Superconducting transition temperature
augmentation
grain size
transition temperature
metals
Roll bonding
Temperature
low carbon steels
energy
Low carbon steel
heat treatment
Heat treatment
temperature dependence
cycles
curves

All Science Journal Classification (ASJC) codes

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

Cite this

Enhancement of low temperature toughness in bulk nanostructured metals. / Tanaka, Masaki; Takano, Shunsaku; Higashida, Kenji.

In: Materials Transactions, Vol. 54, No. 9, 04.09.2013, p. 1624-1628.

Research output: Contribution to journalArticle

Tanaka, Masaki ; Takano, Shunsaku ; Higashida, Kenji. / Enhancement of low temperature toughness in bulk nanostructured metals. In: Materials Transactions. 2013 ; Vol. 54, No. 9. pp. 1624-1628.
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