Effects of Ni addition and cyclic sintering on microstructure and mechanical properties of coarse grained WC–10Co cemented carbides |
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| Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. KaiDa Powder Metallurgy Co., Ltd, Changsha 410083, China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, China;2. State Key Laboratory of Cemented Carbide, Zhuzhou, Hunan 412000, China;3. Institute for Materials Microstructure, Central South University, Changsha, Hunan 410083, China;4. School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China;1. Faculty of Materials and Manufacturing, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing 100124, China;2. Xiamen Tungsten Co., Ltd., Xiamen 361009, China;3. Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China;4. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China;5. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China |
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| Abstract: | Coarse grained WC–10(Co, Ni) cemented carbides with different Ni contents were fabricated by sintering-HIP and cyclic sintering at 1450 °C. The effects of Ni addition and cyclic sintering on the microstructures, magnetic behavior and mechanical properties of coarse grained WC–10(Co, Ni) cemented carbides have been investigated using scanning electron microscope (SEM), magnetic performances tests and mechanical properties tests, respectively. The results showed that the mean grain size of hardmetals increases from 3.8 μm to 5.78 μm, and the shape factor Pwc decreases from 0.72 to 0.54, with the Ni content increases from 0 to 6 wt.%. Moreover, the W solubility reaches the highest value of 10.33 wt.% when the Ni content is 2 wt.%. The hardness and transverse rupture strength of WC–8Co–2Ni are 1105 HV30 and 2778 MPa, respectively. The cyclic sintering is conducive to increase the WC grain size of WC–10(Co, Ni) and improves the transverse rupture strength of WC–10Co without compromising the hardness of alloys. |
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