Carbon content dependence of grain growth mode in VC-doped WC–Co hardmetals |
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| Affiliation: | 1. Institute of Engineering Innovation, The University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan;2. WPI Advanced Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai-shi, Miyagi 980-8577, Japan;3. Tsukuba Plant, Mitsubishi Materials Corp., 1511 Furumagi, Joso-shi, Ibaraki 300-2795, Japan;4. Japan New Metals Co., Ltd., 1-6-64, Sen-nari-cho, Toyonaka-shi, Osaka, Japan;5. Japan Fine Ceramics Center, 2-4-1, Rokuno, Atsuta-ku, Nagoya 456-8587, Japan;6. Department of Quantum Engineering, Nagoya University, Furou-cho, Chidane-ku, Nagoya-shi, Aichi 464-8603, Japan;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;3. Hunan Provincial Key Defense Laboratory of High Temperature Wear-Resisting Materials and Preparation Technology, Hunan University of Science and Technology, Xiangtan 411201, China;1. Materials & Coating Development Center, Research & Development Division, Advanced Materials & Tools Company, Mitsubishi Materials Corporation, 1511 Furumagi, Joso-shi, Ibaraki 300-2795, Japan;2. Research & Development Division, Advanced Materials & Tools Company, Mitsubishi Materials Corporation, 3–2, Otemachi 1-chome, Chiyoda-ku, Tokyo 100-8117, Japan;1. Materials Science and Engineering, KTH Royal Institute of Technology, Brinellv. 23, 100 44 Stockholm, Sweden;2. Sandvik Coromant R&D, Lerkrogsv. 19, 126 79 Stockholm, Sweden;3. Seco Tools AB, Björnbacksv. 2, 737 82 Fagersta, Sweden;4. Å̊ngström Tribomaterials Group, Applied Materials Science, Uppsala University, Lägerhyddsv. 1, 751 21 Uppsala, Sweden |
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| Abstract: | Carbon content dependency of grain growth mechanism and grain growth inhibition mechanism in VC-doped WC–Co hardmetals is investigated. VC-doped WC–Co hardmetals with three different carbon contents were sintered with liquid phase and then rapidly quenched to freeze up the structure at the sintering temperature. In these samples, spatial distributions and atomic scale structures of V-rich phases are investigated using transmission electron microscopy (TEM) and related techniques. In these measurements, doped V is found in liquid phase as solute, in large (W,V)Cx precipitates and in interface segregations. Further detailed observations and discussions are carried out for the (W,V)Cx segregated at the WC grain/Co phase interfaces. These (W,V)Cx phases change their form from planar films to small islands depending on the carbon content. The WC grain/Co phase interfaces are fully covered by planar (W,V)Cx in the sample of low carbon content. On the other hand, the WC grain/Co phase interfaces are partially covered by (W,V)Cx islands in the material of high carbon content. During sintering, the WC grains in this sample grew much faster than those in the sample of low carbon content. These structural differences are discussed in terms of WC grain/(W,V)Cx interface energy. |
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