Details

Autor(en) / Beteiligte

• Li, Xiaofeng
• Liu, Yong
• Wei, Wei
• Du, Meng
• Li, Kaiyang
• Zhou, Jianhua
• Fu, Kun

Titel

Influence of NbC and VC on microstructures and mechanical properties of WC–Co functionally graded cemented carbides

Ist Teil von

• Materials & design, 2016, Vol.90, p.562-567

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Functionally graded cemented carbides (FGCCs) usually have a coarse-grained surface layer. In order to refine the grain size of WC and to improve the mechanical properties, VC and NbC as grain growth inhibitors, were added to WC–6Co FGCCs. The grain growth kinetics of WC was investigated, and both the room temperature and high temperature mechanical properties were tested. The results show that the additions of NbC and VC reduce the thickness of the gradient layer in FGCCs. The addition of VC reduces the thickness of the gradient layer by half, while that of NbC is less effective. The additions of NbC and VC refine the grain size by suppressing the adsorption/desorption processes of WC grains in Co phase during the pre-sintering and the carburizing processes, and VC is more effective than NbC. The addition of NbC increases the transverse rupture strength of FGCCs, because of the fine microstructure, and the solution strengthening in Co phase. Both the additions of NbC and VC increase the high temperature hardness of FGCCs due to improved oxidation resistance, more homogeneous and finer microstructures. •The additions of NbC and VC reduce the gradient layer in functionally graded cemented carbides, and VC is more effective.•The additions of NbC and VC refine the grain size of WC of functionally graded cemented carbides.•The addition of NbC dramatically increases the transverse rupture strength of functionally graded cemented carbides.•The additions of NbC and VC enhance high temperature hardness from 600 to 800°C of functionally graded cemented carbides. [Display omitted]