SYMPOSIA PAPER Published: 01 January 2003

Fretting Fatigue Properties of WC-Co Thermal Sprayed NiCrMo Steel


Fretting fatigue tests of NiCrMo steel (JIS SNCM439) sprayed with ungsten carbide with additive of 12% cobalt (WC-Co) by HVOF (High Velocity Oxygen Fuel) were carried out to study the effect of WC-Co coating on fretting fatigue behavior. Since the fatigue strength of the present alloy steel was reduced to about 27% by the effect of fretting, fretting fatigue strength was improved by approximately 30% by WC-Co spraying onto the specimen. The tangential force coefficient, which is tangential force measured during the fretting fatigue tests divided by contact load, behaviors of WC-Co sprayed specimen were different form those of the non-sprayed specimen. Especially, the tangential force of WC-Co specimen in an early stage of the test indicated significant low value compared with that of non-sprayed specimen and this was caused from good wear resistance of WC-Co layer. Therefore, the initiation of a fretting crack in case of WC-Co sprayed specimen delayed, and crack propagation rate was lower than that of non-sprayed specimen. These were main reasons for the improvement of fretting fatigue strength by WC-Co spray.

Author Information

Okane, M
Toyama University, Toyama, Japan
Shiozawa, K
Toyama University, Japan
Hiki, M
Toyama University, Japan
Suzuki, K
Ohsuzu Giken Co. Ltd., Hamamatsu, Japan
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Developed by Committee: E08
Pages: 385–399
DOI: 10.1520/STP10772S
ISBN-EB: 978-0-8031-5476-6
ISBN-13: 978-0-8031-3456-0