Fatigue properties of ultra-fine grained dual phase ferrite/martensite low carbon steel

M. Okayasu, K. Sato, M. Mizuno, D. Y. Hwang, D. H. Shin

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)


An examination has been made of the fatigue properties of ultra-fine grained two phase ferrite/martensite low carbon steel, produced by equal channel angular pressing (ECAP). The fatigue strength and fracture mechanism of the ECAP steel were compared with those of the as-received sample. The fatigue strength of the ECAP steel was twice as high as that of the as-received steel. The fatigue strength was linearly related to the tensile strength for both the ECAP and as-received steels although their slopes were different; the slope for the ECAP steel was greater. In addition, different fracture characteristics were observed; intergranular fractures were dominant in the ECAP steel whereas transgranular fractures occurred in the as-received steel. Such differences in fatigue strength and fracture characteristic are attributed to their material properties.

Original languageEnglish
Pages (from-to)1358-1365
Number of pages8
JournalInternational Journal of Fatigue
Issue number8
Publication statusPublished - Aug 2008
Externally publishedYes


  • Dual phase steel
  • Equal channel angular pressing
  • Fatigue properties
  • Fracture mechanism
  • Ultra-fine grain

ASJC Scopus subject areas

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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