Effect of stress ratio on fatigue lifetime and crack growth behavior of WC-Co cemented carbide

Hiroko Mikado, Sotomi Ishihara*, Noriyasu Oguma, Kenichi Masuda, Syo Kitagawa, Shingo Kawamura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Two types of fatigue tests, a rotating bending fatigue test and a three- or four-point bending fatigue test, were carried out on a fine grained WC-Co cemented carbide to evaluate its fatigue crack growth behavior and fatigue lifetime. From successive observations of the specimen surface during the fatigue process, it was revealed that most of the fatigue lifetime of the tested WC-Co cemented carbide was occupied with crack growth cycles. Using the basic equation of fracture mechanics, the relationship between the fatigue crack growth rate (da/dN) and the maximum stress intensity factor (Kmax) was derived. From this relation, both the values of the threshold intensity factor (Kth) and the fatigue fracture toughness (Kfc) of the material were determined. The fatigue lifetime of the WC-Co cemented carbide was estimated by analysis based on the modified linear elastic fracture mechanics approach. Good agreement between the estimated and experimental fatigue lifetimes was confirmed.

Original languageEnglish
Pages (from-to)s14-s19
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume24
Issue numberSUPPL. 1
DOIs
StatePublished - 2014

Keywords

  • WC-Co cemented carbides fatigue lifetime crack growth rate stress intensity factor

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Geotechnical Engineering and Engineering Geology
  • Metals and Alloys
  • Materials Chemistry

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