Microstructures and wear-resistance of WC-reinforced high entropy alloy composite coatings by plasma cladding: effect of WC morphology

ABSTRACT

WC-reinforced FeCoCrNi high entropy alloy (HEA) composite coatings with different WC morphology of spherical and irregular shape, were prepared by plasma cladding. The effects of WC morphology on carbide evolution, WC dissolution, and the wear resistance of the coatings were investigated. The results indicated that the evolution of the massive and fish-bone M₆C carbides were significantly influenced by the WC morphology, due to the different curvature radius of WC particles. The dissolution mechanism of spherical WC was diffusion, which of irregular WC was decarburization and oxidation. Although irregular WC particles were broken due to the WC→W₂C transformation, the wear resistance of the coating with irregular WC was relatively stable, only slightly lower than that of spherical WC, because the developed fish-bone carbide in HEA matrix resisted the three-body abrasive wear of broken WC and W₂C fragments.

KEYWORDS:

• WC morphology
• high entropy alloys
• composite coatings
• Microstructure evolution‌
• carbides
• Interface
• Dissolution of WC‌
• wear resistance

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors are grateful for the financial support of the National Natural Science Foundation of China [grant number 51731006], State Key Laboratory of Powder Metallurgy [grant number CSU 621011808], the Natural Science Foundation of Hunan Province [grant number 2020JJ4738], and the Ministry of Science and Technology of the People’s Republic of China [grant number G20190010113].