Establishment of a constitutive model for tungsten carbide with different cobalt content and grain size based on the split Hopkinson pressure bar impact test

The efficient precision machining of tungsten carbide has always been a challenge for many reasons, one of which is the lacking of fundamental investigations on the dynamic mechanical properties of WC-Co. In this article, five different types of tungsten carbides (WC-8Co, WC-12Co, WC-15Co, WC-15CoX, and WC-20CoC) were tested by the split Hopkinson pressure bar (SHPB) test, and the Johnson-Cook (JC) model parameters were obtained using least squares fitting as well as the influence of cobalt content and grain size on JC model parameters were investigated. The JC model parameters were verified to be accurate by comparing the cutting force and chip morphology of cutting simulation with DEFORM V11.0 software and of orthogonal cutting tests. The maximum deviation between experimental and simulated cutting forces in the tangential and normal directions were 15.4