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Investigation of Wear Resistance and Microstructure of Ti-CP Coated by TIG Hardfacing Method Using Cored Wire Electrodes in Argon/Nitrogen Atmosphere

Vaghefinazari, Bahram | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43688 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kokabi, Amir Hossain
  7. Abstract:
  8. In present study, a CP-Ti surface was coated with cored wire electrodes filled with graphite powder by means of TIG cladding technique. The process was performed under controlled atmosphere with different composition of Argon and Nitrogen. The parameters of the process were changed in order to investigate the resulting effect on the coating microstructure and the wear properties. The microstructure and the composition in the weld and heat affected zone were carefully investigated by optical microscope, SEM, EDS and XRD. As the result, TiC dendrites were produced in-situ with different morphologies which are dependent on variation of the parameters. Moreover, TiN dendrites were in-situ produced at lower welding speed and when two passes were performed. The hardness of the surface increased in all treated materials and the maximum hardness of the surface was observed when it was coated with cored wire electrodes with 15% volume of nitrogen in two passes of coating which was 10 times of the non-treated surface. Pin-on-disk wear tests exhibited the better wear resistance and lower friction coefficient of the coated surfaces than the untreated material which is attributed to the presence of hard intermetallic compounds such as TiC, TiNx, and Ti(C,N) in the microstructure.

  9. Keywords:
  10. Cored Wire ; Titanium ; Wear Resistance ; Tungsten Inert Gas (TIG)Welding ; Titanium Nitride Nanoparticles ; Titanium Carbide

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