Authors:
Jean-Michel Missiaen (Univ. Grenoble Alpes, France),
Mathilde Labonne (Univ. Grenoble Alpes, France),
Olivier Lavigne (Hyperion Materials & Technologies, Spain),
Luis Garcia (Hyperion Materials & Technologies, Spain)
Abstract:
Cemented carbides are widely used for cutting and drilling tools. They usually combine a WC hard carbide phase and a Co-based ductile binder. NbC-Ni materials are considered as a possible alternative, especially for wear applications. The advantageous economic situation for raw materials sourcing, their interesting mechanical properties and low density have raised a new interest for these materials. However, mechanical properties can be limited by the rapid grain growth during liquid phase sintering, as compared to WC-Co. Grain growth can be controlled by the addition of secondary carbides such as Mo2C. In this paper, a quantitative EBSD analysis of grain growth is performed for NbC-12vol%Ni materials sintered at 1360°C with controlled addition of Mo2C. The average grain size decreases continuously with Mo2C content. The results are discussed based on a more detailed interface characterization and on a previous model for the cooperative migration of phase boundaries and grain boundaries.
DOI:
https://doi.org/10.59499/WP225371483