Microstructure and mechanical properties of NbC-matrix hardmetals with secondary carbide addition and different metal binders
Source abstract
Abstract
Abstract NbC has a relatively high hardness (19.6 GPa) and melting temperature (3600 °C) and is usually applied as a grain growth inhibitor in WC–Co hardmetals. The current study reports on the influence of the sintering technology and overall chemical composition on the microstructure and mechanical properties of NbC-based hardmetals, using Co as a binder. The partial replacement of NbC by 5 wt.% WC, Mo2C, VC or TiC allows one to significantly improve the hardness and toughness of the NbC–Co materials. The influence of different binders, i.e., Co, 316L stainless steel and Fe3Al on the microstructure and mechanical properties of NbC-based hardmetals was also investigated. The powder mixtures were sintered in the solid state by PECS and liquid state by conventional vacuum sintering. Detailed microstructural analysis was conducted by EPMA elemental mapping and WDS point analysis. Mechanical properties, including Vickers hardness and indentation toughness were assessed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (29)
Show source-provided references
1. Inhibition of grain growth on submicron cemented carbides
2. Grain growth inhibition in liquid phase sintered nanophase WC/Co alloys
3. WC grain growth and grain growth inhibition in nickel and iron binder hardmetals10.1016/S0263-4368(01)00070-1 ↗
4. Pierson · 1996
5. Systems of niobium monocarbide with transition metals10.1016/0022-5088(72)90145-2 ↗
6. The eta-carbides in the ternary system Fe–W–C at 1250°C10.1016/0025-5416(77)90209-9 ↗
7. Physical and chemical nature of cemented carbides10.1179/095066079790136363 ↗
8. Influence of WC addition on the microstructure and mechanical properties of NbC–Co cermets10.1016/j.jallcom.2006.05.015 ↗
9. Properties of NbC–Co cermets obtained by spark plasma sintering10.1016/j.matlet.2006.05.011 ↗
10. Binderless WC and WC–VC materials obtained by pulsed electric current sintering10.1016/j.ijrmhm.2007.09.003 ↗
11. The wetting of solids by molten metals and its relation to the preparation of metal–matrix composites10.1007/BF01160545 ↗
12. Titanium carbonitride-based cermets: process and properties10.1016/0921-5093(93)90588-6 ↗
13. Microstructure of Ti (CN)–WC–NbC–Ni Cermets10.1111/j.1151-2916.2001.tb00750.x ↗
14. Formation of core/rim structures in Ti(C, N)–WC–Ni cermets via a dissolution and precipitation process10.1111/j.1151-2916.2000.tb01415.x ↗
15. Wettability and bonding between Ni and Ti(C, N) with multiple carbide additions
16. Liquid phase sintering of carbides using a nickel–molybdenum alloy
17. Modeling of the temperature distribution during field assisted sintering10.1016/j.actamat.2005.05.042 ↗
18. Image-Pro Plus, version 4, Media Cybernetics, Silver Spring, Maryland.
19. Indentation fracture of WC–Co cermets
20. Wetting of metallic carbides by liquid copper, nickel, cobalt, and iron
21. A study on microstructural changes in Ti(CN)–NbC–Ni cermets10.1016/S0921-5093(98)00609-1 ↗
22. Ti(C, N) cermets — metallurgy and properties10.1016/0263-4368(95)00027-G ↗
23. Storms · 1967
24. Effect of carbides on the microstructure and properties of Ti(C, N)-based ceramics10.1111/j.1151-2916.1999.tb02216.x ↗
25. Growth behavior of rounded (Ti, W)C and faceted WC grains in a Co matrix during liquid phase sintering10.1016/j.actamat.2005.06.021 ↗
26. Inhibition of grain growth on submicron cemented carbides
27. Fine-grained WC–VC–Co hardmetal10.1179/pom.1996.39.3.210 ↗
28. NbC as grain growth inhibitor and carbide in WC–Co hardmetals10.1016/j.ijrmhm.2007.09.003 ↗
29. On the fracture toughness of cemented carbides10.1016/0001-6160(88)90143-5 ↗