Microstructure and Properties of Ultrafine WC-Co-VC Cemented Carbides with different Co Content
Ultrafine WC-Co-VC cemented carbides are used extensively in a variety of industrial environments for their excellent mechanical properties and outstanding wear resistance.Co content affects the service performance of the cemented carbides.In the present study, the influence of Co content on microstructure, physical and mechanical properties was investigated systematically.Ultrafine WC-Co-VC cemented carbides with varying Co content from 4.0 to 7.0wt% and assistance of VC (0.35wt.%) as inhibitor of WC grain growth were prepared.The physical and mechanical properties were tested and the microstructure characteristics were observed using metalloscope and SEM.From the results, it was found that with Co content increasing, both the cobalt magnetism and bending strength increased, while the coercive force, Rockwell hardness, density and abrasive wear resistance decreased.In addition, the metalloscope and SEM results showed that the increase of Co content in WC-Co-VC cemented carbides tended to reduce the quentity and size of micro-pores, and make the change of fracture mode from brittle fracture to ductile fracture.
Ultrafine Cemented carbide Co content Microstructure Properties
Shi Kai-hua Zhou Ke-chao Li Zhi-you Zan Xiu-qi Dong Kai-lin Jiang Qing
State Key Laboratory of Powder Metallurgy,Central South University,Changsha410083,China Zi Gong Cemented Carbide Corporation Limited,Zigong643011,China
国内会议
四川自贡
英文
64-74
2013-10-01（万方平台首次上网日期，不代表论文的发表时间）