The Dependence of Microcrack Density on Microstructure During Quasi-plastic Deformation of WC-Co

摘要

Owing to the unique combination of high modulus, strength and moderate fracture toughness, cemented tungsten carbides are widely used in demanding applications, such as metal cutting tools and rock drill bits. Using Hertzian indentation technique, the quasi-plasticity of a series of WC-Co under indentation loads was characterized. Damage accumulation such as plastic deformation zone, microcrack locations were examined in detail. The microcrack densities were measured and correlated with microstructure parameters such as grain size, mean free path, contiguity and cobalt content. The study shows that Hertzian indentation technique is a useful approach for gaining insights on the dependence of mechanical properties on microstructure of WC-Co materials.