Microstructure and properties of WC-12Co composite coatings prepared by laser cladding |
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| Affiliation: | 1. School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, PR China;2. School of Civil Engineering, Xuzhou University of Technology, Xuzhou 221000, PR China;1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;2. Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201620, China;3. Department of Engineering, Lancaster University, Bailrigg, Lancaster LA1 4YW, United Kingdom;1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. Nanjing University of Science and Technology, Nanjing 210094, China;3. Nanjing Institute of Railway Technology, Nanjing 210031, China;1. Key Laboratory of Lightweight and High Strength Structural Materials of Jiangxi Province, Nanchang University, Nanchang 330031, China;2. Laboratory of Tribology, Nanchang University, Nanchang 330031, China;3. Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan;4. School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China;5. Institute of Applied Physics, Jiangxi, Academy of Sciences, Nanchang 330029, China |
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| Abstract: | A comprehensive study of the phase composition, microstructure evolution, microhardness and wear performance of WC-12Co composite coatings fabricated by laser cladding using coaxial powder-feed mode was presented. It was shown that a combination of high scan speed and high laser energy density made WC on the edge of WC-12Co composite powders partially melt in liquid Co and 304 stainless steel matrix, and then new carbides consisting of lamellar WC and herringbone M3W3C (M=Fe, Co) were formed. Meanwhile, WC-12Co composite coatings with no porosity, cracks and drawbacks like decarburization were obtained, showing high densification and good metallurgical bonding with the substrate. Furthermore, a considerably high microhardness of HV0.3 1500-1600, low coefficient of friction of 0.55 and wear rate of (2.15±0.31)×10-7 mm3/(N·m) were achieved owing to the synergistic effect of excellent metallurgical bonding and fine microstructures of composite coating under laser power of 1500 W. |
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| Keywords: | laser cladding WC-12Co composite coatings microstructure evolution microhardness wear performance |
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