Inverse temperature dependence of toughness in an ultrafine grain-structure steel

Yuuji Kimura, Tadanobu Inoue, Fuxing Yin, Kaneaki Tsuzaki

研究成果: ジャーナルへの寄稿学術誌査読

277 被引用数 (Scopus)

抄録

Materials are typically ductile at higher temperatures and become brittle at lower temperatures. In contrast to the typical ductile-to-brittle transition behavior of body-centered cubic (bcc) steels, we observed an inverse temperature dependence of toughness in an ultrahigh-strength bcc steel with an ultrafine elongated ferrite grain structure that was processed by a thermomechanical treatment without the addition of a large amount of an alloying element. The enhanced toughness is attributed to a delamination that was a result of crack branching on the aligned {100} cleavage planes in the bundles of the ultrafine elongated ferrite grains strengthened by nanometer-sized carbides. In the temperature range from 60° to -60°C, the yield strength was greater, leading to the enhancement of the toughness.

本文言語英語
ページ(範囲)1057-1060
ページ数4
ジャーナルScience
320
5879
DOI
出版ステータス出版済み - 5月 23 2008
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 一般

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