Microstructure and Properties of WC-(Co-Ni) Cemented Carbides with Plate-like WC Grains
LU Xuepeng1,2,3, TU Yankun3, ZHENG Yong3, DONG Zuowei3
1 Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing Institute of Technology, Nanjing 211167; 2 College of Material Engineering, Nanjing Institute of Technology, Nanjing 211167; 3 College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016
Abstract: WC-(Co-Ni) cemented carbides with plate-like WC grains were produced by vacuum sintering. The effects of Ni/(Ni+Co) ratio on the microstructure and mechanical properties of WC-(Co-Ni) cemented carbides were studied by X-ray diffracto-metry (XRD), scanning electron microscopy (SEM) and energy dispersive spectrdmeter (EDS). The results showed that with the increasing Ni/(Ni+Co) ratio, the ratio of plate-like WC grains in the microstructure of cemented carbides decreased, the sizes of hard phase particles gradually increased, and the average length-thickness ratio of hard phase particles gradually decreased. When the Ni/(Ni+Co) ratio was too high, the hard phase particles in cemented carbides were merged together, resulting in an obvious decrease of its mechanical properties. As the Ni/(Ni+Co) ratio was 0.3 or 0.5, WC-(Co-Ni) cemented carbides exhibited good mechanical properties, which was related to the smaller hard phase particles and bigger average length-thickness ratio of hard phase particles. WC-(Co-Ni) cemented carbides with Ni/(Ni+Co) ratio of 0.5 exhibited better mechanical properties, the TRS, hardness and KIC were 2 448 MPa, 90.0HRA, 21.2 MPa·m1/2, respectively.
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2017, Vol. 31 
