Microstructure and properties of WC-Co pellet-strengthened high entropy alloy composite hard coatings prepared by laser cladding
LAN Yang1, MA Qingyuan1, YANG Zihan1, ZHANG Wenhui1, PENG Yingbo1,2, ZHENG Jun3, ZHANG Wei1, LIU Huiren4, XU Xiongliang4
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. College of Engineering, Nanjing Agricultural University, Nanjing 210031, China; 3. School of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, China; 4. Zhuzhou Jinwei Cemented Carbide Co., Ltd., Zhuzhou 412100, China
Abstract：WC and WC-Co spherulite hard phases were added to FeCoCrNiMo0.15 high entropy alloy powder respectively, and WC/HEA and WC-Co/HEA high entropy alloy composite coatings prepared on 304 stainless steel substrate by laser cladding method, respectively. The microstructure, hardness, wear resistance and corrosion resistance of the two composite coatings were studied and compared with the properties of the Ni60/WC composite coatings prepared by vacuum diffusion welding. The results show that the WC particles in the WC-Co/HEA coating have high sphericity and few pores and cracks. Adding Co element can effectively avoid the decomposition of WC during the laser cladding process. The average microhardness (HV) of WC/HEA and WC-Co/HEA composite coatings are both above 800 MPa. The average microhardness (882.55 MPa) of WC-Co/HEA coating is higher than that of WC/HEA coating hardness (817.27 MPa), and the average friction factor (0.40) of WC-Co/HEA coating is slightly lower than that of the WC/HEA coating (0.46). Compared with Ni60/WC coating, HEA-based coating has better retention and wet tability to WC, which can reduce the interfacial reaction between coating and WC, so the microhardness of WC-Co/HEA composite coating, friction and wear performance, corrosion resistance are better than that of Ni60/WC and WC/HEA coatings.
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2022, Vol. 27 
