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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 6    December 2009

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Effect of VC and NbC additions on microstructure and properties of
 ultrafine WC-10Co cemented carbides
XIAO Dai-hong(肖代红)1, HE Yue-hui(贺跃辉)1, LUO Wei-hong(罗伟红)2, SONG Min(宋 旼)1

1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Hunan Import and Export Company of Chinese Automobile Industry, Changsha 410001, China

Abstract:The nanocomposite WC-Co powders were prepared through planetary ball milling method. Effects of grain growth inhibitor addition and the vacuum sintering parameters on the microstructure and properties of ultrafine WC-10Co cemented carbides were investigated using X-ray diffractometer, scanning electron microscope and mechanical property tester. The results show that VC and NbC additions can refine the WC grains, decrease the volume fraction of Co3W3C phase in ultrafine WC-10Co cemented carbides, and increase the hardness and fracture toughness of the base alloys. After sintering for 60 min at 1 400 ℃, the average grain size and hardness of ultrafine-grained WC-10Co-1VC cemented carbide are 470 nm and HRA 91.5, respectively. The fracture toughness of cemented carbide WC-10Co-1NbC alloy is over 7 MN·m−3/2.

 

Key words: ultrafine WC-10Co cemented carbide; VC; NbC; microstructure; mechanical properties

ISSN 1672-7029
CN 43-1423/U

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