Abstract
In the present work, the effect of annealing temperature on the microstructure, mechanical and tribological properties of NiCr–WC–Co coatings produced by the high-velocity oxy-fuel (HVOF) technique has been investigated. X-ray diffraction and scanning electron microscopy revealed the dissolution of WC into the NiCr matrix to form W2C and Cr3C2 with the annealing process. This dissolution became complete at 800 °C. The mechanical properties of the coatings were investigated using nano-indentation and Vickers fracture toughness measurements. These measurements suggested that the hardness, Young’s modulus, and fracture toughness values increased because of the newly formed carbide phases as a result of the dissolution of the WC particles. The overall properties of the coatings were found to be optimum for annealing temperatures of 800 °C. The wear mechanism appears to be abrasive in the as-sprayed coating, and it becomes a combination of an abrasive and oxidative wear with increasing the annealing temperature.
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Acknowledgments
The authors thank Mr. Fouad Boudjellal (ETS Metalizing) for the HVOF spraying process and the personnel of CRTI for their help and contribution. We also acknowledge Prof. Djamel Miroud, Head of research (LSGM laboratory USTHB), for his continued support.
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Mazouzi, A., Djerdjare, B., Triaa, S. et al. Effect of annealing temperature on the microstructure evolution, mechanical and wear behavior of NiCr–WC–Co HVOF-sprayed coatings. Journal of Materials Research 35, 2798–2807 (2020). https://doi.org/10.1557/jmr.2020.237
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DOI: https://doi.org/10.1557/jmr.2020.237