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Improving micro-hardness of stainless steel through powder-mixed electrical discharge machining

Mohd Zain, Zakaria and Ndaliman, Mohammed Baba and Khan, Ahsan Ali and Ali, Mohammad Yeakub (2014) Improving micro-hardness of stainless steel through powder-mixed electrical discharge machining. Journal of Mechanical Engineering Science. pp. 1-7. ISSN 0954-4062

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Powder-mixed electrical discharge machining (PMEDM) is the technique of using dielectric fluid mixed with various types of powders to improve the machined surface output. The process is fast gaining prominence in electrical discharge machining (EDM) industry. The objective of this investigation is to determine the ability of tantalum carbide (TaC) powder-mixed dielectric fluid to enhance the surface properties of stainless steel material during EDM. The properties of investigated are the micro-hardness and corrosion characteristics of the EDMed surface. Machining was conducted with 25.0g/L concentration of TaC powder in kerosene dielectric fluid. The machining variables used were the peak current, pulse on time and pulse off time. The effects of variables on the micro-hardness of the EDMed surface were determined. Corrosion tests were also conducted on the samples that exhibited higher hardness. Results showed that the EDMed surface was alloyed with elements from the TaC powder. The micro-hardness obtained with PMEDM is about 1,200Hv. This is about 1.5 times obtained without TaC powder in the dielectric fluid. The loss in weight during corrosion test was found to be 0.056 ug/min for PMEDM which was lower than the lowest value of 10.56 ug/min obtained for the EDM without powder dielectric fluid.

Item Type: Article (Journal)
Additional Information: 3129/37768
Uncontrolled Keywords: Powder-mixed electrical discharge machining, micro-hardness, tantalum carbide powder, SUS 304 stainless steel, corrosion
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: 18 Aug 2014 13:37
Last Modified: 19 Sep 2017 09:36
URI: http://irep.iium.edu.my/id/eprint/37768

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