The effect of residual stress in HVOF tungsten carbide coatings on the fatigue life in bending of thermal spray coated aluminum

One factor that affects the suitability of tungsten carbide (WC) coatings for wear and corrosion control applications is the fatigue life of the coated part. Coatings, whether anodized or thermal spray coated, can reduce the fatigue life of a part compared to an uncoated part. This study compares th...

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Bibliographic Details
Published in:Journal of thermal spray technology 1998-12, Vol.7 (4), p.546-552
Main Authors: MCGRANN, R. T. R, GREVING, D. J, SHADLEY, J. R, RYBICKI, E. F, BODGER, B. E, SOMERVILLE, D. A
Format: Article
Language:English
Subjects:
Aluminum
Aluminum base alloys
Applied sciences
Bending (deformation)
Carbides
Coatings
Compressive properties
Compressive stress
Exact sciences and technology
Fatigue life
Fatigue testing
Metals. Metallurgy
Nonmetallic coatings
Production techniques
Residual stress
Residual stresses
Sprayers
Spraying
Sprays
Stress analysis
Substrates
Surface treatment
Tensile testing
Tungsten carbide
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Summary:One factor that affects the suitability of tungsten carbide (WC) coatings for wear and corrosion control applications is the fatigue life of the coated part. Coatings, whether anodized or thermal spray coated, can reduce the fatigue life of a part compared to an uncoated part. This study compares the fatigue life of uncoated and thermal spray coated 6061 Al specimens. The relation between the residual stress level in the coating and the fatigue life of the specimen is investigated. Cyclic bending tests were performed on flat, cantilever beam specimens. Applied loads placed the coating in tension. Residual stress levels for each of the coating types were determined experimentally using the modified layer removal method. Test results show that the fatigue life of WC coated specimens is directly related to the level of compressive residual stress in the coating. In some cases, the fatigue life can be increased by a factor of 35 by increasing the compressive residual stress in the coating.
ISSN:1059-9630
1544-1016
DOI:10.1361/105996398770350774