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Microstructural investigation and machining performance of NbC-Ti(C₀.₅N₀.₅) matrix cermets

Journal Contribution - Journal Article

In this study, Ni or Co + Ni bonded NbC matrix cermets with secondary carbides (Mo₂C and WC) as well as Ti(C₀.₅N₀.₅) were prepared by liquid phase sintering at 1450 °C in vacuum. Detailed microstructural investigation was performed by SEM, EPMA and XRD analysis. The microstructure, mechanical properties as well as the C45 (HB140) steel turning performance of the cermets were investigated, and compared with a commercial Ti(C₀.₅N₀.₅) based cutting insert. The sintering results indicated that the partial substitution of NbC by Ti(C₀.₅N₀.₅) had a significant effect on the core-rim microstructure and refinement of NbC solution grains, as well as improved mechanical properties of the NbC-Ti(C₀.₅N₀.₅) cermets. The phase constitution and composition of the cermets were supported by thermodynamic equilibrium calculations. All sintered cermets were composed of a fcc solid solution metal binder and a cubic core-rim NbC based solution phase, as well as an independent N-rich Ti(C,N) phase. The NbC-Ti(C₀.₅N₀.₅) and Ti(C₀.₅N₀.₅) matrix cermets had a comparable HV₃₀ of 1500–1600 kg/mm² and a similar fracture toughness of 8.0 MPa m¹⁄².
Journal: International Journal of Refractory & Hard Metals
ISSN: 0263-4368
Volume: 84
Publication year:2019
BOF-keylabel:yes
IOF-keylabel:yes
BOF-publication weight:1
CSS-citation score:1
Authors:International
Authors from:Higher Education
Accessibility:Open