WC-Co系超硬合金の圧縮疲労特性

概要

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The dependence of WC grain size and Co content of WC-Co cemented carbides on compressive fatigue strength and monotonic compressive strength was investigated using cylindrical specimens. WC grain sizes from 0.6 to 6μm and Co content from 5 to 20wt% were tested. The S-N diagrams of the range from 10^<-1> to 10^7 cycles were obtained, and they had two straight lines: i.e., a gentle slope in the low-cycle area and a steep slope in the high-cycle area. The cemented carbides with a WC grain size of 0.6μm and a Co content of 5wt% had the steeper slope. The fatigue strength at 10^6 cycles increased with decreasing WC grain size and Co content until 10wt%. The strength for a Co content of 5wt% markedly decreased as compared to that of 10wt%. These fatigue properties were discussed from the stand point of the fracture morphology, ductility and crack extension resistance of the cemented carbides.
1990-06-25