The effect of volume fraction of WC particles on wear behavior of in-situ WC/Fe composites by spark plasma sintering |
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| Affiliation: | 1. Advanced Manufacture Technology Center, China Academy of Machinery Science and Technology, Beijing, 100083, China;2. State Key Laboratory for Advanced Forming Technology and Equipment, China Academy of Machinery and Technology, Beijing, 100083, China;3. School of Material Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China;1. State Key Lab of Powder Metallurgy, Central South University, Changsha, Hunan 410083, China;2. College of Metallurgy and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China;1. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;2. Institute of Engineering Research, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China;1. School of Mechanical and Electrical Engineering, Nanchang university, Nanchang 330031, China;2. School of Materials Science, Wuhan University of Technology, Wuhan 430070, China;3. State Key Lab of Advanced Welding and Joining, Harbin Institute of Technology, 150001, China;4. Institute of Applied Physics, Jiangxi Academy of Sciences, Nanchang 330029, China;5. Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan;6. Nishinippon Institute of Technology, Obase, Fukuoka 803-0394, Japan |
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| Abstract: | Tungsten carbide (WC) particles have been in-situ synthesized through the reaction between tungsten particles and carbide particles by spark plasma sintering (SPS). The composites with different WC content were comparatively observed by the techniques of scanning electron microscopy (SEM), high-resolution transmission electron microscope (HRTEM), X-ray diffraction, hardness and pin-to-disc abrasive wear test. The results showed that the formed WC particles were homogenously distributed in the iron matrix with the size of smaller than 25 μm. Additionally, with the increasing of the WC content, the hardness of composites, the microhardness of matrix and the wear resistance increased, but there was no change significantly between 32 vol% WC/Fe composites and 42 vol% WC/Fe composites. The composites possessed excellent wear resistance comparing the specific wear rate determined in the present work to the martensitic wear-resistant steel under the load of 80 N after a sliding distance of ~ 950 m. The specific wear rate of the martensitic wear-resistant steel was a factor of 24 and 48 times higher than WC/Fe composites, when the content of WC was 32 vol% and 42 vol% in WC/Fe composites, respectively. The main wear mechanism was synthetic of abrasion wear and oxidation wear. The wear performance of 32 vol% WC/Fe composites didn't appear to be much different from 42 vol% WC/Fe composites, due to the WC particles in the 42 vol% composites produced stress concentration easily, which could ultimately induce the creak initiation around WC particles in the subsurface (near wear surface) and propagation to wear surface promoting the breakup of surface film. |
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