Rolling contact fatigue characteristics of thermal sprayed tungsten carbide coatings

Book · Sat Dec 30 23:00:00 EST 1995

OSTI ID:379582

Nieminen, R; Vuoristo, P; Niemi, K; Maentylae, T ^[1]

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1. Tampere Univ. of Technology (Finland)

The rolling contact fatigue (RCF) behavior of tungsten carbide (WC) based cermet coatings (WC-12% Co) deposited by plasma and HVOF spraying was studied. The RCF testing was carried out with a two-roll configuration testing machine under unlubricated rolling conditions without sliding. Loads applied in the tests resulted to Hertzian contact pressures of 420--600 MPa. The influence of spraying method on the RCF behavior of the coatings was studied as a function of Hertzian contact stress. Plasma sprayed coating showed severe surface roughening and subsurface cracking of the coating under all studied load levels. HVOF sprayed coating behavior was clearly different from the plasma coating with smaller structural changes. HVOF coating retained its original surface roughness but vertical cracks penetrating the coating appeared in this coating.

• OSTI ID: 379582
• Report Number(s): CONF-9509182--; ISBN 0-87170-541-9
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERMETS
CHEMICAL COMPOSITION
COBALT
CRACKS
EXPERIMENTAL DATA
FATIGUE
FLAME SPRAYING
MICROHARDNESS
MICROSTRUCTURE
MORPHOLOGY
OPTICAL MICROSCOPY
PLASMA ARC SPRAYING
POROSITY
POWDERS
SCANNING ELECTRON MICROSCOPY
SPRAY COATING
STRESSES
SURFACES
TUNGSTEN CARBIDES
X-RAY DIFFRACTION