Study the Effects of Dielectric Type on the Machining Characteristics of γ-Ti Al in Electrical Discharge Machining

Abstract:

The current study surveys the results of using deionized water and kerosene as dielectrics in the machining outputs of γ-TiAl intermetallic compound obtained in electric discharge machining. Influences of these different dielectrics properties on machining speed, tool wear, surface cracks and roughness were compared. Scanning electron microscopy micrographs were prepared to investigate influences of dielectrics on the surface characteristics of electrically discharged samples. Results indicate which by kerosene dielectric; the material removal rate (MRR) is further compared to another one. But deionized water as dielectric causes higher tool wear ratio than kerosene dielectric. Electrical discharged samples in deionized water have higher surface roughness, in addition it contains surface cracks, whereas kerosene dielectric results better surface finish in low pulse current. According to XRD spectra electric discharge machining in deionized water and kerosene dielectrics produces Ti₃ Al intermetallic compound on the produced surface.

• Periodical: International Journal of Engineering Research in Africa (Volume 33)
• Pages: 40-49
• DOI: https://doi.org/10.4028/www.scientific.net/JERA.33.40
• Online since: November 2017
• Authors: Mohammad Reza Shabgard, Hossein Faraji, Behnam Khosrozade*, Hadi Eivazi-Bagheri, Keivan Amini
• Keywords: Dielectric, Pulse Current, Pulse on Time, Surface Integrity, γ-TiAl

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