Investigation into the microstructure and cutting performance of (Ti, Ta, W)(CN)–Co/Ni cermets. (November 2015) - Oh, Se-Woong
Abstract: WC is an effective additive to improve the mechanical properties of Ti(CN)–Co/Ni cutting tool materials, such as fracture toughness and hardness, as well as sinterability. In this work, the microstructural evolution and changes in mechanical properties of TiCN–(TiW)C–WC–TaC–Co/Ni cermet alloys caused by the addition of (TiW)C are investigated. The core/rim structure is observed in a Ti(CN)–Co/Ni cermet both with and without a small addition of (TiW)C; the core disappears gradually with the increase of (TiW)C content. The addition of (TiW)C improves important mechanical properties, such as fracture toughness and hardness, and wear resistance under wet cutting condition. Highlights: The microstructural evolution, mechanical properties and cutting performance of TiCN-WC-TaC- x (TiW)C-Co/Ni were investigated. The core/rim structure was observed in Ti(CN)-Co/Ni cermets both with and without small additions of (TiW)C. The large addition of (TiW)C resulted in the breakdown of the core/rim structure. The large addition of (TiW)C improved the hardness and fracture toughness, resulting in the enhanced cutting performance.