Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 25, Issue 4, Pages 1194-1199Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(15)63715-3
Keywords
coarse grained WC-9Co cemented carbides; TaC; Ta content; W content
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Funding
- Fundamental Research Funds for the Central Universities of China [2013zzts025]
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Coarse grained WC-9Co cemented carbides with 0-1.0% TaC (mass fraction) were fabricated by HIP-sintering and gas quenching. The effects of TaC on the microstructures and mechanical properties were investigated using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDS), X-ray diffractometry (XRD) and mechanical properties tests. The results show that the maximum values of hardness and strength are HV 1124 and 2466 MPa respectively when 0.4% TaC is added. When the content of TaC is more than 0.6%, the grain size of WC is no longer affected by the amount of TaC, and (W,Ta)C occurs as well. Moreover, the strength and fracture toughness increase and the (Ta+W) content decreases with the increase of TaC content. The dependence of (Ta+W) content on the mechanical properties indicates that (Ta+W) content in Co should be decreased as low as possible to improve the mechanical properties of coarse grained WC-TaC-9Co cemented carbides with the microstructure of WC+gamma two phase regions.
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