OS1537 Short Fatigue Crack Growth Behavior in the WC-Co Cemented Carbide

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  • OS1537 超硬合金の微小疲労き裂進展挙動

Abstract

It is well known that WC-Co cemented carbides have an excellent wear resistance. However, information about their fatigue crack-growth behavior and fatigue properties is limited. In the present study, a rotating bending fatigue test was carried out on a fine-grained WC-Co cemented carbide to evaluate its fatigue life and crack-growth behavior. From successive observations of the specimen surface during the fatigue process, it was revealed that most of the fatigue life of the tested WC-Co cemented carbide was occupied with crack-growth cycles. Using the basic equation of fracture mechanics, the relation between the rate of fatigue crack-growth da/dN and the maximum stress intensity factor K_<max> of the WC-Co cemented carbide was derived. From this relation, both the value of the threshold intensity factor K_<th> and the fatigue fracture toughness K_<fc> of the material were determined. Fatigue lives of the WC-Co cemented carbide were estimated based on the fatigue crack-growth law. Furthermore, relationship between its crack-growth rate and crack-growth path was studied on the basis of the detailed observations of the crack-growth path.

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