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

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

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 proper...

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Bibliographic Details
Published in:International journal of refractory metals & hard materials Vol. 84; p. 105038
Main Authors: Huang, S.G., Nie, H.B., Guo, X.Y., Vleugels, J., Huang, J.H., Mohrbacher, H., Rajendhran, N.K., Sukumaran, J., De Baets, P., Cannizza, E., Woydt, M.
Format: Journal Article
Language:English
Published: Shrewsbury Elsevier Ltd 01-11-2019
Elsevier BV
Subjects:
Carbonitride
Cermet
Cermets
Fracture toughness
Liquid phase sintering
Liquid phases
Machining performance
Mechanical properties
Microstructure
Molybdenum carbide
Niobium carbide
Sintering
Solid solutions
Thermodynamic equilibrium
Titanium
Turning (machining)
Carbonitride
Niobium carbide
Machining performance
Cermet
Sintering
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Summary: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. •Full dense Ni or Co + Ni bonded NbC matrix cermets with Mo2C and WC as well as Ti(C0.5N0.5) were prepared by liquid phase sintering at 1450 °C in vacuum.•The sintering results indicated that the partial substitution of NbC by Ti(C0.5N0.5) had a significant effect on the microstructural refinement, the formation of a core-rim microstructure and improved mechanical properties of the NbC-Ti(C0.5N0.5) cermets.•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. The flank wear during dry turning of C45 steel decreased with increasing Ti(C0.5N0.5) content. The 32 and 42 wt% Ti(C0.5N0.5) containing NbC-based inserts exhibited a respectively comparable and lower flank wear than a commercial Ti(C0.5N0.5)-based insert.
ISSN:0263-4368
2213-3917
DOI:10.1016/j.ijrmhm.2019.105038