Original Article

Microstructure and wear analysis of CoWC alloy layers deposited by PTA process

¹ Inonu University, Scientific and Technological Research Center, 44280 Malatya, Turkey
² Sivas Cumhuriyet University, Faculty of Technology, Department of Manufacturing Engineering, 58140 Sivas, Turkey
³ Namık Kemal University, Faculty of Engineering, Department of Mechanical Engineering, 59860 Çorlu, Tekirdag, Turkey

^* e-mail: tanjuteker@cumhuriyet.edu.tr

Received: 28 June 2022
Accepted: 9 January 2023

Abstract

CoWC composite coatings were produced on AISI 430 steel by the plasma transfer arc cladding. Three different powder mixtures containing WC (90%, 85% and 80%) and Co (10%, 15% and 20%) were used. Phase composition, microstructural characterization and coating properties were investigated by using scanning electron microscope (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), elemental mapping, hardness and wear test. The wear shape morphology of coatings was determined by SEM. The increased ratio of WC in CoWC powders reduced the degradation of CoWC. The substrate hardness of 180 HV gained a coating hardness value of approximately 462 HV. An increase in the hardness of the coating alloy compared to the substrate was achieved. W₂C, WC, CoC and Co₆W₆C phases were determined on the coating surface. The high levels of WC concentration on the coating surface increased the wear resistance.