Microstructure and thermal shock properties of WC-TiC-VC-Fe cemented carbides
WC-TiC-VC-Fe cemented carbides were successfully prepared by vacuum sintering method,and the effects of TiC and VC addition on microstructure and thermal shock properties of the WC-Fe cemented carbides were investigated.The results show that the addition of TiC and VC results in the formation of(W,Ti,V)C solid solutions in the cemented carbides.With the increase of TiC and VC content,the grain size of WC shows a trend of first decreasing and then increasing,and the minimum grain size is 0.86 μm.When the addition amounts of TiC and VC are 3 mass％each,the performance of the cemented carbide is the best,and the thermal shock times for material failure is 160.By adding TiC and VC,the thermal fatigue crack propagation mode of the cemented carbides is changed.Due to the newly formed phases,the spacing between WC is increased,effectively improving the crack propagation resistance and enhancing its thermal shock resistance.
NETL
NSTL
万方数据
