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Effect of carbon content on the microstructure and mechanical properties of NbC-Ni based cermets

(2018) METALS. 8(3).
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Abstract
The aim of this work was to correlate the overall carbon content in NbC-Ni, NbC-Ni-VC and NbC-Ni-Mo starting powders with the resulting microstructure, hardness, and fracture toughness of Ni-bonded NbC cermets. A series of NbC-Ni, NbC-Ni-VC and NbC-Ni-Mo cermets with different carbon content were prepared by conventional liquid phase sintering for 1 h at 1420 degrees C in vacuum. Microstructural analysis of the fully densified cermets was performed by electron probe microanalysis (EPMA) to assess the effect of carbon and VC or Mo additions on the NbC grain growth and morphology. A decreased carbon content in the starting powder mixtures resulted in increased dissolution of Nb, V, and Mo in the Ni binder and a decreased C/Nb ratio in the NbC based carbide phase. The Vickers hardness (HV30) and Palmqvist indentation toughness were found to decrease significantly with an increasing carbon content in the Mo-free cermets, whereas an antagonistic correlation between hardness and toughness was obtained as a function of the Mo-content in Mo-modified NbC cermets. To obtain optimized mechanical properties, methods to control the total carbon content of NbC-Ni mixtures were proposed and the prepared cermets were investigated in detail.
Keywords
GRAIN-GROWTH INHIBITION, WC-CO CERMETS, LATTICE PARAMETER, HARDMETALS, CARBIDE, ALLOYS, VC, niobium carbide, cermet, hardmetal, liquid phase sintering, carbon, hardness

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Chicago
Huang, Shuigen, Patrick De Baets, Jacob Sukumaran, Hardy Mohrbacher, Mathias Woydt, and Jozef Vleugels. 2018. “Effect of Carbon Content on the Microstructure and Mechanical Properties of NbC-Ni Based Cermets.” Metals 8 (3).
APA
Huang, S., De Baets, P., Sukumaran, J., Mohrbacher, H., Woydt, M., & Vleugels, J. (2018). Effect of carbon content on the microstructure and mechanical properties of NbC-Ni based cermets. METALS, 8(3).
Vancouver
1.
Huang S, De Baets P, Sukumaran J, Mohrbacher H, Woydt M, Vleugels J. Effect of carbon content on the microstructure and mechanical properties of NbC-Ni based cermets. METALS. 2018;8(3).
MLA
Huang, Shuigen et al. “Effect of Carbon Content on the Microstructure and Mechanical Properties of NbC-Ni Based Cermets.” METALS 8.3 (2018): n. pag. Print.
@article{8601472,
  abstract     = {The aim of this work was to correlate the overall carbon content in NbC-Ni, NbC-Ni-VC and NbC-Ni-Mo starting powders with the resulting microstructure, hardness, and fracture toughness of Ni-bonded NbC cermets. A series of NbC-Ni, NbC-Ni-VC and NbC-Ni-Mo cermets with different carbon content were prepared by conventional liquid phase sintering for 1 h at 1420 degrees C in vacuum. Microstructural analysis of the fully densified cermets was performed by electron probe microanalysis (EPMA) to assess the effect of carbon and VC or Mo additions on the NbC grain growth and morphology. A decreased carbon content in the starting powder mixtures resulted in increased dissolution of Nb, V, and Mo in the Ni binder and a decreased C/Nb ratio in the NbC based carbide phase. The Vickers hardness (HV30) and Palmqvist indentation toughness were found to decrease significantly with an increasing carbon content in the Mo-free cermets, whereas an antagonistic correlation between hardness and toughness was obtained as a function of the Mo-content in Mo-modified NbC cermets. To obtain optimized mechanical properties, methods to control the total carbon content of NbC-Ni mixtures were proposed and the prepared cermets were investigated in detail.},
  articleno    = {178},
  author       = {Huang, Shuigen and De Baets, Patrick and Sukumaran, Jacob and Mohrbacher, Hardy and Woydt, Mathias and Vleugels, Jozef},
  issn         = {2075-4701},
  journal      = {METALS},
  language     = {eng},
  number       = {3},
  pages        = {13},
  title        = {Effect of carbon content on the microstructure and mechanical properties of NbC-Ni based cermets},
  url          = {http://dx.doi.org/10.3390/met8030178},
  volume       = {8},
  year         = {2018},
}

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