Micromechanical investigations of CVD coated WC-Co cemented carbide by micropillar compression. (15th January 2020) - El Azhari, Idriss
Abstract: Deformation behavior of an industrial coated cemented carbide (WC-Co substrate coated with CVD multilayer of TiN/Zr(C, N)/Ti(C, N, O)/Al2 O3 ) was investigated by means of micropillar compression method. In addition to the WC-Co substrate pillars, new composite pillar combination consisting of substrate, TiN interlayer and carbonitride hard coating were tested. The study targeted to document and analyze interactions between different phases and components (substrate, interlayer and coating) while subjected to compressive stress. It is found that deformation of the substrate depends mainly on the assemblage and the distribution of WC and Co phases within the pillar. The phase assemblage is subjected to changes after deformation which has an impact on the stiffness. Detailed analysis of plastic deformation within WC coarse grains pointed out that strain energy can be extensively dissipated in this phase by means of single and multiple slip. The composite/hybrid pillar formed by association of the substrate and the coating enhanced the ultimate strength in comparison to their respective individual components, highlighting the effective load-bearing response of coating and substrate acting as a coated system. This assessment was further supported by the excellent interfacial strength attested by the established TiN interlayer between the substrate and the coating. Graphical abstract: Image 1 Highlights: During compression, stiffness of WC-Co micropillars is a convolution of elastic response and microplasticity events. Deformation of WC-Co micropillars depends on the microstructural assemblage and the distribution of both phases. Hybrid coating/substrate pillar shows enhanced micromechanical response, combining coating strength and substrate toughness. TiN interlayer provides excellent interfacial strength between the hardmetal substrate and the Zr(C, N) coating.