Grain size effect on high-speed deformation of Hadfield steel

Rintaro Ueji, Daisuke Kondo, Yoshinori Takagi, Takashi Mizuguchi, Yasuhiro Tanaka, Kazunari Shinagawa

研究成果: Contribution to journalArticle査読

12 被引用数 (Scopus)

抄録

The influence of the microstructure on the tensile properties and fracture behavior of Hadfield steel at high strain rate were studied. Hadfield steel samples with different mean grain sizes and carbon phases were prepared by rolling at medium temperatures and subsequent annealing. A sample with an average grain size larger than 10 lm, and a small number of carbides shows ductility with local elongation (post uniform elongation) at a highspeed tensile deformation rate of 103 s-1. In addition, the fracture surface changes from brittle to ductile with increasing strain rate. In contrast, a fine-grained sample with carbides undergoes brittle fracture at any strain rate. The grain size dependence is discussed by considering the dynamic strain aging as well as the emission of dislocation from cracks. The accelerated diffusion of carbon due to grain refinement is considered as one of the important reason for brittle fracture in the fine-grained Hadfield steel.

本文言語英語
ページ(範囲)7946-7953
ページ数8
ジャーナルJournal of Materials Science
47
22
DOI
出版ステータス出版済み - 11 2012
外部発表はい

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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