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Microstructure and mechanical properties of WC-10Co cemented carbide containing VC or (Ta, Nb)C and fracture toughness evaluation using different models

Soleimanpour, A. M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijrmhm.2011.10.004
  3. Abstract:
  4. This article describes a study on WC-10Co cemented carbides with different percent of grain growth inhibitors. Samples were prepared by the conventional powder metallurgy method, using WC and Co powder and different concentrations of VC and (Ta, Nb)C powder. All samples were processed using a hot isostatic press (HIP) and the effect of grain growth inhibitors on the microstructure and mechanical properties were investigated. Additionally, microstructure and powder particle morphology were examined using scanning electron microscopy (SEM) and electron dispersive spectroscopy (EDS). The specimen's microstructure proved that the addition of VC is more effective at suppressing grain growth than (Ta, Nb)C. Besides the microstructure observations, hardness, transverse rupture strength (TRS) and indentation fracture toughness (IFT) were evaluated. Due to the brittleness of the cemented carbides, fracture toughness was evaluated using different IFT models. The IFT values were determined by measuring the lengths of the cracks generated at the corners of a Vicker's indentation
  5. Keywords:
  6. Metal matrix composite ; Cemented carbides ; Grain growth inhibitors ; Hot isostatic press ; Indentation fracture toughness ; Metal matrix composite ; Microstructure and mechanical properties ; Microstructure observation ; Powder particles ; Transverse rupture strength ; WC-10Co ; C (programming language) ; Carbide tools ; Fracture mechanics ; Fracture toughness ; Grain growth ; Hardness ; Mechanical properties ; Metallic matrix composites ; Microstructure ; Niobium ; Powder metallurgy ; Powder metals ; Scanning electron microscopy ; Sintering ; Tantalum ; Tantalum carbide ; Tungsten carbide ; Fracture
  7. Source: International Journal of Refractory Metals and Hard Materials ; Volume 31 , 2012 , Pages 141-146 ; 02634368 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0263436811001855