Effects of Composition, Microstructure and Processing On the Residual Stress of WC-9.5Co Substrates

摘要

Changes in the surface residual stress were examined in a series of WC-9.5Co inserts as the composition and microstructure were varied. A minimum in the residual stress was observed in the WC + Co two-phase field with magnetic saturation, a function of carbon and tungsten content in the binder. The presence of cubic carbide additions tends to increase the magnitude of the residual stress, with the change in residual stress varying with different cubic carbides. Further, the magnitude of the residual stress was observed to decrease with decreasing WC grain size. The residual stress decreases as the cooling rate from the sintering temperature decreases. Processing differences between vacuum sintering and sinter HIPping also exert an influence on the residual stress.