Abstract
Coarse grained WC–10(Co, Ni) cemented carbides with different Ni contents were fabricated by sintering-HIP and cyclic sintering at 1450°C. The effects of Ni addition and cyclic sintering on the microstructures, magnetic behavior and mechanical properties of coarse grained WC–10(Co, Ni) cemented carbides have been investigated using scanning electron microscope (SEM), magnetic performances tests and mechanical properties tests, respectively. The results showed that the mean grain size of hardmetals increases from 3.8μm to 5.78μm, and the shape factor Pwc decreases from 0.72 to 0.54, with the Ni content increases from 0 to 6wt.%. Moreover, the W solubility reaches the highest value of 10.33wt.% when the Ni content is 2wt.%. The hardness and transverse rupture strength of WC–8Co–2Ni are 1105HV30 and 2778MPa, respectively. The cyclic sintering is conducive to increase the WC grain size of WC–10(Co, Ni) and improves the transverse rupture strength of WC–10Co without compromising the hardness of alloys.
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