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Effect of annealing temperature on the microstructure evolution, mechanical and wear behavior of NiCr–WC–Co HVOF-sprayed coatings

Published online by Cambridge University Press:  26 August 2020

Azzeddine Mazouzi ,
Boubekeur Djerdjare ,
Salim Triaa ,
Amine Rezzoug ,
Billel Cheniti  and
Samir M. Aouadi
Azzeddine Mazouzi
Affiliation:
Laboratoire des Sciences et Génie des Matériaux (LSGM), Faculté de Génie Mécanique et du Génie des Procédés, Université des Sciences et de la Technologie Houari Boumediene, 16111 Bab-Ezzouar, Algiers, Algeria
Boubekeur Djerdjare
Affiliation:
Laboratoire des Sciences et Génie des Matériaux (LSGM), Faculté de Génie Mécanique et du Génie des Procédés, Université des Sciences et de la Technologie Houari Boumediene, 16111 Bab-Ezzouar, Algiers, Algeria
Salim Triaa
Affiliation:
Laboratoire des Sciences et Génie des Matériaux (LSGM), Faculté de Génie Mécanique et du Génie des Procédés, Université des Sciences et de la Technologie Houari Boumediene, 16111 Bab-Ezzouar, Algiers, Algeria
Amine Rezzoug
Affiliation:
Research Center in Industrial Technologies (CRTI), 16014Cheraga, Algeria
Billel Cheniti
Affiliation:
Research Center in Industrial Technologies (CRTI), 16014Cheraga, Algeria
Samir M. Aouadi*
Affiliation:
Department of Materials Science and Engineering, University of North Texas, Denton, Texas76207, USA
*
a)Address all correspondence to this author. e-mail: samir.aouadi@unt.edu
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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.

Keywords

NiCr–WC10–Co coatingsHVOFthermal stabilityannealingmechanical properties
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 20 , 28 October 2020 , pp. 2798 - 2807
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Copyright
Copyright © Materials Research Society 2020

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