Influence of dielectric fluids on surface properties of electrical discharge machined titanium alloy

Mohammed , Baba Ndaliman and Khan, Ahsan Ali and Mohammad , Yeakub Ali (2013) Influence of dielectric fluids on surface properties of electrical discharge machined titanium alloy. Journal of Engineering Manufacture, 227 (9). pp. 1310-1316. ISSN 2041-2975 (O), 0954-4054 (P)

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Abstract

Dielectric fluid is one of the major components of electrical discharge machining. In this article, the influence of two dielectric fluids on the surface properties of workpiece was investigated. Machining was conducted on the titanium alloy (Ti-6Al-4V) with the new Cu-TaC composite electrodes under the two dielectric fluids, which are the urea solution and distilled water. Cu-TaC electrodes were produced from copper and tantalum carbide powders by powder metallurgy method with 50/50% composition at compacting pressure of 24.115 MPa. The main objective is to compare the effect of these dielectric fluids on the electrical discharge machined surface properties—microhardness (Mh) and surface roughness (Ra). The machining variables used to investigate the Ra and Mh were peak current and pulse duration. The surface roughness was found to be generally higher in the specimens machined with urea solution dielectric fluid, the highest being 19.05 mm. For the specimens machined with distilled water dielectric fluid, the highest Ra is 14.45 mm. The highest microhardness improvement ratio attained by the specimens electrical discharge machined with urea dielectric fluid is about 48% higher than those machined with distilled water. It is concluded that distilled water dielectric fluid gave better surface roughness, while the urea dielectric fluid provides the machined surface with higher microhardness.

Item Type:	Article (Journal)
Additional Information:	3129/31935
Uncontrolled Keywords:	Electrical discharge machining, urea solution, distilled water, surface roughness, microhardness, Ti-6Al-4V alloy
Subjects:	T Technology > TS Manufactures > TS200 Metal manufactures. Metalworking
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Prof. Dr. Ahsan Ali Khan
Date Deposited:	23 Sep 2013 15:20
Last Modified:	23 Sep 2013 15:20
URI:	http://irep.iium.edu.my/id/eprint/31935

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