- Title
- Surface engineering : laser metal deposition of titanium alloy Grade 5 and tungsten
- Creator
- Ndou, Ndivhuwo
- Subject
- Lasers - Industrial applications, Gas tungsten arc welding, Mechanical wear, Pulsed laser deposition, Titanium alloys - Fatigue
- Date
- 2017
- Type
- Doctoral (Thesis)
- Identifier
- http://hdl.handle.net/10210/269875
- Identifier
- uj:28675
- Description
- D.Phil. (Mechanical Engineering), Abstract: Titanium alloy Grade 5 (Ti6Al4V) has attracted the interest of the engineering community, because of its excellent physical and mechanical properties. Due to its low density, superior quality at high temperature and good corrosion resistance, Ti6Al4V alloy is used in the aerospace industry. The alloy has also been applied in many areas, such as sport, marine, the chemical industry, the automotive industry and the biomedical field – due to its excellent corrosion resistance in a corrosive environment or medium. Because of the poor wear-resistance properties exhibited by the alloy, five weight percent of tungsten (W) was agglomerated with it, this percentage weight addition of tungsten was optimised, in order to improve its surface properties in this research study. The tungsten is selected due to its superior strength, creep resistance, and structural stability at elevated temperatures. Trial experiments were first conducted with the two powders, Ti6Al4V and W (Ti6Al4V+W). The parameters with good laser deposition process were selected for the preliminary studies. The relationships between the process parameters on the material characterizations were thoroughly investigated. Design Expert 9 software was used to validate the experimental results. In the design of the experiment, the Response Surface Methodology (RSM) was used to determine the required process parameters standard order and the leverage, as well as the response to the input factors. The model was validated to establish the variations between the predicted value and the actual value. The laser deposited Ti6Al4V+W specimens were characterized through the evolving microstructures, dry sliding wear, corrosion, microhardness and x-Ray diffraction.
- Contributor
- Akinlabi, E.T., Prof., Pityana, S., Prof.
- Language
- English
- Rights
- University of Johannesburg
- Full Text
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