Residual Stress State and Hardness Depth in Electric Discharge Machining: De-Ionized Water as Dielectric Liquid

Ekmekçi, Bülent; Elkoca, Oktay; Tekkaya, A. Erman; Erden, Abdülkadir

doi:10.1081/mst-200051244

Cited by 59 publications

(29 citation statements)

References 24 publications

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“…Thermal stress is produced when the electrode discharges bombard the surface of the sample during the machining process. Tensile stress within the sample is generated because not all of the material that melts during the machining process is swept away from the component's surface by the dielectric (Ekmekci et al, 2005). Due to the entrance of carbon, the melted material contracts more than the unaffected parent part during the cooling process, and when the stress in the surface exceeds the material's ultimate tensile strength, cracks are formed.…”

Section: Results and Discussion On Micro-crack Formationmentioning

confidence: 99%

Microstructure Analysis and Material Transformation of Pure Titanium and Tool Wear Surface After Wire Electric Discharge Machining Process

Kumar

2014

Machining Science and Technology

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The wire electric discharge machining process is an alternative for machining of the high strength temperature resistant materials. The present research work is mainly focused on the investigation of integrity of the work surface and wire electrode surface after machining with WEDM. Experimental results showed that pulse-on time, pulse-off time and peak current significantly affected the surface integrity with the formation of deep-wide overlapping craters, pock marks, debris, micro-cracks and recast layer. Both carbides and oxides were formed either in free form and/or in compound form due to decomposition of de-ionized water, machined samples and wire material. The compounds like titanium dioxide (rutile) (TiO 2 ), (TiO 0.325 ), Ti 2 O 3, Ilmenite (Fe 2 Ti 4 O), titanium carbides (TiC) and copper titanium dioxide (Cu 3 TiO 4 ) were formed due to phase transformations that were analyzed through X-ray diffraction and energy dispersive X-ray method. The effect of process parameters on the wear of wire surface has also been considered.

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Section: Results and Discussion On Micro-crack Formationmentioning

confidence: 99%

Microstructure Analysis and Material Transformation of Pure Titanium and Tool Wear Surface After Wire Electric Discharge Machining Process

Kumar

2014

Machining Science and Technology

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“…The amount of retained austenite phase and the intensity of micro-cracks have found to be much less in the white layer of the samples machined in de-ionized water dielectric liquid. The number of globule appendages attached to the surface increased when a carbon-based tool electrode material or a dielectric liquid was used during machining (Ekmekci et al, 2005). On the other hand, penetrating cracks, which penetrate the entire white layer thickness to an extent into the parent material, are mainly formed due to contraction of the recast structure joined to the circumferential edge of a crater rim during solidification.…”

Section: Introductionmentioning

confidence: 97%

Surface crack density and recast layer thickness analysis in WEDM process through response surface methodology

Kumar

2016

Machining Science and Technology

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In this work, quantitative assessment of surface damage in terms of parameters like surface crack density and recast layer thickness in wire electrical discharge machining (WEDM) process has been undertaken. The effect of processing conditions on crack formation is studied using scanning electron microscope. Surface crack density and recast layer thickness analysis in terms of machining parameters such as pulse on time, pulse off time, peak current, spark gap voltage significantly deteriorate the microstructure of machined samples, which produces the deeper, wider overlapping craters, pock marks, globules of debris and micro cracks. The microstructure analysis of WEDM surface was based upon the theory of electrical discharge phase and metallurgical physics. It is found that the pulse on time, pulse off time and peak current are the most dominating parameters for both surface crack density and recast layer thickness.

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“…They have reported a high tensile stress level and a wide profile associated with surface stress relaxation for hardenable steels. A qualitative relationship with the operating parameters was presented by Ekmekci et al [20]. Then, a semi-empirical equation was suggested for scaling residual stresses in EDM'ed surfaces [21].…”

Section: Introductionmentioning

confidence: 99%

Residual stresses and white layer in electric discharge machining (EDM)

Ekmekçi

2007

Applied Surface Science

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204

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Residual Stress State and Hardness Depth in Electric Discharge Machining: De-Ionized Water as Dielectric Liquid

Cited by 59 publications

References 24 publications

Microstructure Analysis and Material Transformation of Pure Titanium and Tool Wear Surface After Wire Electric Discharge Machining Process

Microstructure Analysis and Material Transformation of Pure Titanium and Tool Wear Surface After Wire Electric Discharge Machining Process

Surface crack density and recast layer thickness analysis in WEDM process through response surface methodology

Residual stresses and white layer in electric discharge machining (EDM)

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