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张帆,张金祥,文小强,肖颖奕,普建.WC-Ni-Fe-Mo硬质合金的微观结构与性能研究[J].稀有金属材料与工程(英文),2020,49(11):3950~3956.[Zhang Fan,Zhang Jinxiang,Wen Xiaoqiang,Xiao Yingyi and Pu Jian.Investigation on Microstructure and Properties of WC-Ni-Fe-MoCemented Carbides[J].Rare Metal Materials and Engineering,2020,49(11):3950~3956.]
Investigation on Microstructure and Properties of WC-Ni-Fe-MoCemented Carbides
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Received:December 03, 2019  Revised:January 11, 2020
Key words: WC-Ni-Fe  Mo addition  Cemented carbide  Low pressure sintering  Mechanical property  
Foundation item:江钨控股集团科技计划项目(项目号JW-18A-03)、赣州市星火计划
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Zhang Fan,Zhang Jinxiang,Wen Xiaoqiang,Xiao Yingyi and Pu Jian  
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      WC–Ni–Fe–Mo cemented carbides with fine properties were prepared by low pressure sintering. The effects of Mo content on the microstructure and properties of WC–Ni–Fe–Mo cemented carbides were analyzed in detail. The results show that the addition of Mo has obvious influence on WC–Ni–Fe cemented carbides. The addition of Mo can refine WC grains to a certain extent by inhibiting the dissolution and precipitation of WC grains in WC–Ni–Fe cemented carbides. With the increase of the of Mo content, the porosity of the alloys decrease gradually. The density of alloys first decreased and then increased, while the bending strength had the opposite trend. When a trace amount of Mo was added, the hardness of alloys was relatively stable, ?the bending strength increased obviously,the fracture toughness had a gradually decreased. When the addition of Mo contents further increased, the hardness and bending strength were both decreased, and the fracture toughness increased. WC–Ni–Fe–Mo cemented carbide with 0.5 wt% Mo had the optimum properties, which can comparable to those of WC–Co cemented carbides with the identical binder ratio. The maximum value of its hardness, bending strength and fracture toughness were HV 1460, 4245 MPa, 17.01 MPa·m1/2, respectively.