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Title: Effect of dielectric on the machining characters of γ-TiAl in EDM process

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Title:
Effect of dielectric on the machining characters of γ-TiAl in EDM process
Author Name:
Mohammadreza Shabgard, Hossein Faraji, Behnam Khosrozade, Hadi Eivazi, Keivan Am
Abstract:
This research investigates the effect of two different kinds of dielectric (kerosene oil and de-ionized water) on the material removal rate, tool wear ratio, surface roughness and surface cracks in electrical discharge machining (EDM) of -TiAl intermetallic compound. The obtained results indicate that by increase of pulse current and pulse on time in both of dielectrics, material removal rate increases. Using kerosene as dielectric, it is observed that the material removal rate is always higher compared to de-ionized water. However, the tool wear ratio in kerosene dielectric seems to be lower than de-ionized water dielectric. Furthermore, in order to explore the effect of dielectrics on the finish quality of the EDM machined surface, SEM images were provided. The machined specimens in kerosene dielectric at low pulse current, exhibited smoother topography, while de-ionized water dielectric produced rougher surface as well as cracks. Based on XRD analysis, EDM using both dielectrics produced Ti3Al intermetallic compound on the machined surface.
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