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Microstructural studies and wear assessments of Ti/TiC surface composite coatings on commercial pure Ti produced by titanium cored wires and TIG process

Monfared, A ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matchemphys.2012.11.009
  3. Publisher: 2013
  4. Abstract:
  5. Tungsten Inert Gas (TIG) process and titanium cored wires filled with micro size TiC particles were employed to produce surface composite coatings on commercial pure Ti substrate for wear resistance improvement. Wire drawing process was utilized to produce several cored wires from titanium strips and titanium carbide powders. Subsequently, these cored wires were melted and coated on commercial pure Ti using TIG process. This procedure was repeated at different current intensities and welding travel speeds. Composite coating tracks were found to be affected by TIG heat input. The microstructural studies using optical and scanning electron microscopy supported by X-ray diffraction showed that the surface composite coatings consisted of α′-Ti, spherical and dendritic TiC particles. Also, greater volume fractions of TiC particles in the coatings were found at lower heat input. A maximum microhardness value of about 1100 HV was measured which is more than 7 times higher than the substrate material. Pin-on-disk wear tests exhibited a better performance of the surface composite coatings than the untreated material which was attributed to the presence of TiC particles in the microstructure
  6. Keywords:
  7. Coatings ; Composite materials ; Wear ; Welding ; Cored wires ; Current intensity ; Drawing process ; Heat input ; Micro-structural ; Pin-on-disk wear test ; Substrate material ; Surface composites ; Ti substrates ; TiC particles ; Titanium carbide powders ; Titanium strip ; Travel speed ; Tungsten inert gas process ; Inert gases ; Scanning electron microscopy ; Surfaces ; Titanium ; Titanium carbide ; Tungsten ; Wear of materials ; Wire ; Wire drawing ; X ray diffraction ; Composite coatings
  8. Source: Materials Chemistry and Physics ; Volume 137, Issue 3 , 2013 , Pages 959-966 ; 02540584 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0254058412009388