Evaluation of static and fatigue strength characteristics for thermal sprayed WC-Co materials by indentation method

Kiminori Nakanishi, Kenichi Sakaue, Takeshi Ogawa, Yoshifumi Kobayashi

Research output: Contribution to journalArticle

Abstract

Static and cyclic indentation tests were performed on the surface and the cross-section of thermal sprayed WC-Co materials. Micro indentation tests revealed that the mechanical properties on the surface are different from those on the cross-section. Also, the static strength on the surface is lower than that on the cross section. Under the static indentation tests, the cracks on the surface formed a ring crack around the impression. On the other hand, the crack on the cross-section grew in the direction perpendicular to the sprayed direction. The results of cyclic indentation tests showed that the cyclic number for the crack initiation decreased with increasing the maximum surface stress. The fatigue strength on the cross section was slightly higher than on the surface. These results mean that thermal-sprayed WC materials clearly have cyclic fatigue behavior and remarkable anisotropy.

Original languageEnglish
Pages (from-to)902-907
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume76
Issue number767
DOIs
Publication statusPublished - 2010 Jul

Keywords

  • Anisotropy
  • Brittle fracture
  • Coating material
  • Fatigue
  • HVOF
  • Indentation

ASJC Scopus subject areas

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

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