Effect of annealing temperature on the microstructure evolution, mechanical and wear behavior of NiCr–WC–Co HVOF-sprayed coatings. Issue 20 (28th October 2020)

• Record Type: Journal Article
• Authors: Mazouzi, Azzeddine; Djerdjare, Boubekeur; Triaa, Salim; Rezzoug, Amine; Cheniti, Billel; Aouadi, Samir M.
• Is Part Of: Journal of materials research. Volume 35:Issue 20(2020)
• Page Start: 2798
• Page End: 2807
• Publication Date: 2020-10-28
• Subjects: NiCr–WC10–Co coatings, -- HVOF, -- thermal stability, -- annealing, -- mechanical properties; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2020.237
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: 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 W2 C and Cr3 C2 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.