Surface modification by electrical discharge machining: A review

Kumar, Sanjeev; Singh, Rupinder; Singh, T. P.; Sethi, B.L.

doi:10.1016/j.jmatprotec.2008.09.032

Cited by 423 publications

(222 citation statements)

References 62 publications

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“…Further, with semi-sintering of the tool electrode, coarseness of surface layer increases compared to a solid electrode. The workpiece and electrode were melted and cooled at high speed [12]. This layer is crystal brittle materials cause crack generation.…”

Section: International Journal Of Chemical Engineering and Applicatiomentioning

confidence: 99%

“…The hardness may belong to TiC which was generated from an electrode material and carbon from dielectric fluid [15]- [19]. Normally, there are three zones on the workpiece when discharge on a steel: The white layer is on the top layer follows Heat Affected Zone (HAZ) and matrix [12], [13]. In case of an alloy metal, Ti6Al4V, the zone under the white layer is not affect from the discharge energy so the micro-hardness is same as hardness of a workpiece (about 260 HV).…”

Section: International Journal Of Chemical Engineering and Applicatiomentioning

confidence: 99%

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Comparison Performances of EDM on Ti6Al4V with Two Graphite Grades

Muttamara¹

2015

IJCEA

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Abstract-Technologies for EDM machining are demanded in many industrial fields. Graphite is widely used as electrode material in EDM. Graphite (Poco EDM-3) and copperinfiltrated-graphite (Poco EDM-C3) electrodes were used to compare the corresponding to EDM properties. The experiments were carried out on Ti6Al4V. Performance in respect to MRR and electrode wear is compared for two graphite qualities. The results show that EDM3 graphite performs very well giving significantly higher MRR than EDM-C3, and also with acceptable relative electrode wear. The surface roughness of workpiece produced by EDM-C3 is better than EDM-3 due to gap distance of EDM-C3 is larger than that produced by EDM-3. The two electrode materials give the same micro-hardness of the layers that are about 800 HV.

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Section: International Journal Of Chemical Engineering and Applicatiomentioning

confidence: 99%

Section: International Journal Of Chemical Engineering and Applicatiomentioning

confidence: 99%

Comparison Performances of EDM on Ti6Al4V with Two Graphite Grades

Muttamara¹

2015

IJCEA

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“…The complex part shapes in metallic carbides or high strength steels are usually manufactured by high energy density processes like electron beam, laser or electric discharge machining (EDM) [1][2][3]. The main advantage of these processes is the low dimensional dispersion comparatively to conventional machining process.…”

Section: Introductionmentioning

confidence: 99%

“…The main disadvantages of these processes are the low-speed machining and the detrimental effects of the high temperature gradients that involve significant changes in the near surface layers [1]. The nature and the extent of these changes depend on the specific process parameters, on the microstructural and thermophysical characteristics of the machined material and on the properties of the electrode tool (in case of EDM) [2]. Numerical studies of thermal aspects of the EDM have been developed for different types of thermal loading and different types of machined materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of electro discharge machining (EDM) on the AISI316L SS white layer microstructure and corrosion resistance

Sidhom

Ghanem

Amadou

et al. 2012

Int J Adv Manuf Technol

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract The localised corrosion resistance of austenitic stainless steels is strongly influenced by the quality of finished surface. EDM machining induces substantial changes by the high thermal gradients generated by electric sparks. Experimental techniques such as roughness measurement, scanning electron microscopy (SEM), energy dispersive microanalysis (EDX) and X-ray diffraction technique, reveal microgeometrical, microstructural, chemical and mechanical changes. These changes lead to white and heat-affected layers with a depth less than 100 μm. The white layer is a melted material characterised by dendritic structure and constituted by austenite, chromium carbide and ε-carbide. The heat-affected layer is characterised by very large grain size comparatively to the bulk material. Electrochemical test coupled with metallographic examinations using SEM reveals a weakening of the resistance to pitting and intergranular corrosion comparatively to diamond polished surface. This weakening is correlated to differences in structure and chemical composition of white layer. Susceptibility to stress corrosion cracking has been attributed to the field of tensile residual stresses resulting from thermal effects. The removal of the white layer material by polishing or wire brushing restores the corrosion resistance of the AISI316L SS.

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“…In recent years, new exploratory research works has been initiated to improve EDM process efficiency using PMEDM [3]. The powder particles help to improve the sparking efficiency during the ignition process [4]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Improving EDM Efficiency with Silicon Carbide Powder-Mixed Dielectric Fluid

Razak¹,

Abdul-Rani²,

Nanimina³

2015

IJMMM

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Abstract-Machining cost for electro-discharge machining (EDM) is high due to longer machining time. EDM efficiency is hypothesize can be increased using powder-mixed dielectric fluid (PMEDM). PMEDM works gradually at low pulse energy and distributes evenly the powder in machining area. PMEDM may lead to improve machined part surface finish, improve material removal rate (MRR) and reduce tool wear rate (TWR). Further investigations on powder concentration and powder particles size for silicon carbide (SiC) PMEDM are proposed. Number of experiments to be conducted is based on Taguchi orthogonal array with three level and two factors. The outcomes are expected capable to increase MRR, improve surface finish, reduce TWR, reduce machining time and reduce machining cost.

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Surface modification by electrical discharge machining: A review

Cited by 423 publications

References 62 publications

Comparison Performances of EDM on Ti6Al4V with Two Graphite Grades

Comparison Performances of EDM on Ti6Al4V with Two Graphite Grades

Effect of electro discharge machining (EDM) on the AISI316L SS white layer microstructure and corrosion resistance

Improving EDM Efficiency with Silicon Carbide Powder-Mixed Dielectric Fluid

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