Microstructure and properties of ultrafine WC-Co-VC cemented carbides with different Co contents  

作　　者：Kai-HuaShi Ke-Chao Zhou Zhi-You Li Xiu-Qi Zan Kai-Lin Dong Qing Jiang 

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China [2]Precision Parts Department,Zigong Cemented Carbide Corporation Limited,Zigong 643011,China

出　　处：《Rare Metals》2022年第6期1955-1960,共6页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.51074189)

摘　　要：Ultrafine WC-Co-VC cemented carbides are used extensively in a variety of industrial environments due to their excellent mechanical properties and outstanding wear resistance.Co content affects the service performance of the cemented carbides.In the present study,the influ-ences of Co content on microstructure,physical,and mechanical properties were investigated systematically.Ultrafine WC-Co-VC cemented carbides with Co content varying from 4 wt%and 7 wt%and assistance of VC(0.35 wt%)as inhibitor of WC grain growth were prepared.The physical and mechanical properties were tested and the microstructure characteristics were observed by optical microscope(OM)and scanning electron microscopy(SEM).From the results,it is found that with Co content increasing,both the cobalt magnetism and bending strength increase,while the coercive force,Rockwell hardness,density,and abrasive wear resistance decrease.In addition,the OM and SEM results show that the increase of Co content in WC-Co-VC cemented carbides tends to reduce the quantity and size of micro-pores,and make the fracture mode change from brittle fracture to ductile fracture.

关 键 词：ULTRAFINE Cemented carbide Co content MICROSTRUCTURE PROPERTIES 

分 类 号：TG135.5[一般工业技术—材料科学与工程]