Hard coatings deposited by various thermal processes: Effect on fatigue resistance of typical alloys for helicopter components
- Agusta S.p.A., Samarate (Italy)
Hard coatings are more and more widely applied on helicopter components to repair worn surfaces and to improve wear and fretting resistance. The potential negative effect of these coatings on fatigue life shall be known for the correct design of the component. Different tungsten carbide based, nickel and chromium oxide coatings were applied by Plasma Spray, Detonation Gun, Super Detonation Gun, Jet Coat, CDS and HVOF on specimens made form the following materials: AISI 9310 and AISI 4340 alloy steels and Ti6Al4V titanium alloy. The rotating bending (R = {minus}1) fatigue life of the coated specimens was evaluated and compared with that of the uncoated specimens. Except for the Super D-Gun process, a general reduction in fatigue life is noted on coated steel specimens, varying from {minus}9 to {minus}47%. On coated titanium specimens the reduction in fatigue life is more sensitive, from {minus}15 to {minus}63%, and the beneficial effect of shot-peening is demonstrated.
- OSTI ID:
- 379585
- Report Number(s):
- CONF-9509182--; ISBN 0-87170-541-9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
CHROMIUM OXIDES
COBALT ALLOYS
COMPOSITE MATERIALS
EXPERIMENTAL DATA
FAILURES
FATIGUE
FLAME SPRAYING
HELICOPTERS
NICKEL
NICKEL ALLOYS
PLASMA ARC SPRAYING
SPRAYED COATINGS
STEELS
STRESSES
SUBSTRATES
TITANIUM BASE ALLOYS
TUNGSTEN CARBIDES