n Journal of Emerging Trends in Engineering and Applied Sciences - Characterizations and solidification projection of As-cast and heat treated vanadium-carbon-nickel alloys

Volume 4, Issue 3
  • ISSN : 2141-7016
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Vanadium carbide (VC) has outstanding tribological behaviour, superior to other similar metals in groups IVB and VB, except TiC. Despite the attractive tribological properties, industrial application of VC is still limited. VC-Ni composites have been seen as a way of improving the wear resistance of nickel alloys but more information is needed on the phase diagram. Alloy compositions were selected based on the three component binaries: Ni-V, C-Ni and C-V. Six ~3g samples were made from the elemental components (of at least 99.65% purity), and were arc-melted under an argon atmosphere, using Ti as an oxygen-getter. The as-cast and heat treated (at 1000oC for 1000 hours and quenched in water) samples were prepared metallographically. Images and composition analyses were obtained from a LEO1525 SEM with EDX, and X-ray diffraction (XRD) analyses were conducted using a Philips (PW-1810) X-ray diffractometer. SEM examination of the as-cast alloys identified seven phases: ~VC, ~NiV, ~NiV, (Ni), ~Ni V, σ′ and ~VC, in agreement with the component binaries. The (Ni) phase had a wide area into the ternary, up to ~15 at. % V and ~12 at.% C. The ~VC + (Ni) and ~VC + (V) eutectics were observed. Solidification projection was successfully constructed for the V-C-Ni system, which gave the phases and their composition ranges on solidification. Heat treated samples had very similar microstructures to the as-cast samples. The observed microstructures suggest the possibility of tailoring fine structured VC-Ni alloys for wear control.

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