Fatigue behavior of thermal sprayed WC-CoCr- steel systems: Role of process and deposition parameters
- Stony Brook Univ., NY (United States). Center for Thermal Spray Research
Thermal spray deposited WC-CoCr coatings are extensively used for surface protection of wear prone components in a variety of applications. Although the primary purpose of the coating is wear and corrosion protection, many of the coated components are structural systems (aero landing gear, hydraulic cylinders, drive shafts etc.) and as such experience cyclic loading during service and are potentially prone to fatigue failure. It is of interest to ensure that the coating and the application process does not deleteriously affect the fatigue strength of the parent structural metal. It has long been appreciated that the relative fatigue life of a thermal sprayed component can be affected by the residual stresses arising from coating deposition. The magnitude of these stresses can be managed by torch processing parameters and can also be influenced by deposition effects, particularly the deposition temperature. In this study, the effect of both torch operating parameters (particle states) and deposition conditions (notably substrate temperature) were investigated through rotating bending fatigue studies. The results indicate a strong influence of process parameters on relative fatigue life, including credit or debit to the substrate's fatigue life measured via rotating bend beam studies. Damage progression within the substrate was further explored by stripping the coating off part way through fatigue testing, revealing a delay in the onset of substrate damage with more fatigue resistant coatings but no benefit with coatings with inadequate properties. Finally, the results indicate that compressive residual stress and adequate load bearing capability of the coating (both controlled by torch and deposition parameters) delay onset of substrate damage, enabling fatigue credit of the coated component.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- Stony Brook Univ., NY (United States); USDOE
- Grant/Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1345538
- Alternate ID(s):
- OSTI ID: 1361652
- Report Number(s):
- SAND-2017-0715J; SAND-2016-9625J; PII: S0257897217302165
- Journal Information:
- Surface and Coatings Technology, Vol. 315, Issue C; ISSN 0257-8972
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Comparative analyzes between thermal spray coatings-40Fe30Ni30CW without and with refusion and coating performed by the coated electrode process-SMAW
|
journal | March 2019 |
Residual Stress in HVOF Thermally Sprayed WC-10Co-4Cr Coating in Landing Gear Application
|
journal | July 2019 |
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