Abstract
The WC-17Co coating was deposited on the Inconel 718 alloy by high-velocity oxygen fuel (HVOF) thermal spray method. The phase composition and fracture of WC-17Co coatings were investigated by XRD method and SEM, respectively. The bending fatigue behaviors of cantilever specimens were also discussed. The effects of ambient temperature (25, 150, 300°C) on the bending fatigue life were studied in this paper as well. The results showed that fatigue cracks were initiated on the surface coating, then propagated toward the substrate/coating interface, and finally penetrated into the substrate. The bending fatigue life of the coated specimen decreased with the increase of ambient temperature. The average compressive residual stress of WC-17Co coatings decreased after heat treatment. Therefore, a higher crack-propagation rate was induced in the surface coating, resulting in the lower fatigue life of the coated specimen.
| Original language | English |
|---|---|
| Pages (from-to) | 87-90 |
| Number of pages | 4 |
| Journal | Hanjie Xuebao/Transactions of the China Welding Institution |
| Volume | 35 |
| Issue number | 2 |
| Publication status | Published - Feb 2014 |
| Externally published | Yes |
Keywords
- Coating
- Fatigue life
- HVOF
- Residual stress
- Temperature