Indian Journal of Engineering & Materials Sciences

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Effect of process parameters and VC content on structural and mechanical properties of WC-20Co nano composites


Affiliations
1 Mechanical Engineering Department, Thapar Institute of Engineering and Technology Patiala, Punjab 147 004, India
2 School of Physics and Materials Science, Thapar Institute of Engineering and Technology Patiala, Punjab 147 004, India

The effect of process parameters and vanadium carbide on hardness, toughness and structural properties of the tungsten carbide-cobalt (WC-Co) nanocomposite has been investigated using micro-hardness tester, X-ray diffraction and scanning electron microscopy (SEM) with attached energy dispersive spectroscopy, respectively. To suppress grain growth, a high percentage (upto 10 wt. %) of vanadium carbide (VC) has been taken as a grain growth inhibitor as well as a hardener. WC-20Co composite with 7.5 wt% VC, heat treated at 1100 °C holding time for 2 hours, possesses high hardness (1687 HV) when the volume fraction of tungsten carbide (WC) and Co6W6C phases have been taken in the ratio of 2:1. High hardness and toughness have been obtained at 1100 °C for 2 h heat-treated sample. High VC content with 8 h holding time has increased the porosity in the samples.
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  • Effect of process parameters and VC content on structural and mechanical properties of WC-20Co nano composites

Abstract Views: 162  | 

Authors

Devender Kumar
Mechanical Engineering Department, Thapar Institute of Engineering and Technology Patiala, Punjab 147 004, India
Kulvir Singh
School of Physics and Materials Science, Thapar Institute of Engineering and Technology Patiala, Punjab 147 004, India

Abstract


The effect of process parameters and vanadium carbide on hardness, toughness and structural properties of the tungsten carbide-cobalt (WC-Co) nanocomposite has been investigated using micro-hardness tester, X-ray diffraction and scanning electron microscopy (SEM) with attached energy dispersive spectroscopy, respectively. To suppress grain growth, a high percentage (upto 10 wt. %) of vanadium carbide (VC) has been taken as a grain growth inhibitor as well as a hardener. WC-20Co composite with 7.5 wt% VC, heat treated at 1100 °C holding time for 2 hours, possesses high hardness (1687 HV) when the volume fraction of tungsten carbide (WC) and Co6W6C phases have been taken in the ratio of 2:1. High hardness and toughness have been obtained at 1100 °C for 2 h heat-treated sample. High VC content with 8 h holding time has increased the porosity in the samples.