Abstract:The effects of dwelling time (5,10,15 and 20min) on the microstructure, phase formation and mechanical properties of cemented carbide and high strength steel composites were investigated by SPS. The results show that with the increase of the dwelling time, the sintering quality is gradually improved, and the bonding interface is smooth and continuous, and there is no obvious crack and delamination. The XRD results showed that WC, Fe and Fe3Co phases existed in the microstructure of the composites when the dwelling time is 5min. When the dwelling time increases to 20min, a new W2C phase is clearly formed. With the increase in dwelling time, microhardness and tensile strength show an increasing trend. When holding time is 20min, the strain when the maximum tensile strength is 152MPa is only 0.22, and the maximum micro-hardness is 1763MPa.
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