Grain size effect on high-speed deformation of Hadfield steel

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

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)7946-7953
Number of pages8
JournalJournal of Materials Science
Volume47
Issue number22
DOIs
Publication statusPublished - Nov 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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