WC-Co系超硬合金の圧縮疲労破壊

概要

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The strength and the fracture morphology of cemented carbides in cyclic compression have been investigated through experiments and a finite-element analysis. Flanged cylindrical specimens with filleted shoulder of WC- (5 to 25 wt.% ) Co cemented carbides were considered. The number of cycles to crack initiation and to failure in compression fatigue of all alloy compositions, except for low-cobalt-content alloys such as 5 wt. % Co alloy, was well arranged by using the load ratio, which is a ratio of the applied maximum compressive stress to the static compressive strength. The low-cobalt-content alloy was split in two from the end surface, and the higher-cobalt content alloys, such as 15 to 25 wt% Co alloys, failed after stable crack growth around the root area. The difference in fracture morphology between alloy composition was discussed through the finite-element stress analysis.
一般社団法人日本機械学会の論文
1992-12-25