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

Ekmekçi, Bülent

doi:10.1016/j.apsusc.2007.05.078

Cited by 200 publications

(79 citation statements)

References 14 publications

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“…Ultrasonic, vibratory, rotary and magnetic field can also improve MRR in EDM [25][26][27][28][29][30]. The residual stresses and white layer have a great relationship with the type of the EDM dielectric [31,32]. Machining performance in the EDM process can be improved effectively through optimal machining parameters [33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on green electrical discharge machining in tap water of Ti–6Al–4V and parameters optimization

Tang

2013

Int J Adv Manuf Technol

102

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Ti-6Al-4V is widely used in the aerospace, automobile, and biomedical fields, but is a difficult-to-machine material. Electrical discharge machining (EDM) is regarded as one of the most effective approaches to machining Ti-6Al-4V alloy, since it is a non-contact electro-thermal machining method, and it is independent from the mechanical properties of the processed material. This paper aims to combine grey relational analysis and Taguchi methods to solve the problem of EDM parameters optimization. From the viewpoint of health and environment, tap water as working fluid has good working environment, since it does not release harmful gas. The process parameters include discharge current, gap voltage, lifting height, negative polarity and pulse duty factor. The electrode wear ratio (EWR), material removal rate (MRR) and surface roughness (SR) as objective parameters are chosen to evaluate the whole machining effects. Experiments were carried out based on Taguchi L 9 orthogonal array and grey relational analysis, and then verified the results through a confirmation experiment. Compared the machining parameters A 1 B 1 C 3 D 2 with A 1 B 2 C 2 D 2 , MRR increased from 1.28 mm 3 /min to 2.38 mm 3 /min, EWR decreased from 0.14 to 0.10 mm 3 /min and SR decreased from Ra 2.37 μm to Ra 1.93 μm. The process parameters sequenced in order of relative importance are: the ratio of pulse width to pulse interval, discharge current, lifting height and gap voltage. The results showed that using tap water machining Ti-6Al-4V material can obtain high MRR, decrease the machining cost and have no harmful to the operators and the environment.

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Section: Introductionmentioning

confidence: 99%

Experimental study on green electrical discharge machining in tap water of Ti–6Al–4V and parameters optimization

Tang

2013

Int J Adv Manuf Technol

102

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“…Tensile stress and microcracks are likely be present there in the case of the EDM carried out with medium or high energy of discharges [1,5,8,9].…”

Section: Basics Of the Edm The Eda And The Roto-peen Machiningmentioning

confidence: 99%

Surface Layer Properties after Successive EDM or EDA and Then Superficial Roto-Peen Machining

Dmowska

Nowicki

Podolak-Lejtas

2012

Advances in Tribology

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The paper presents the results of the influence of basic electrical discharge machining EDM parameters and electrical discharge alloying EDA parameters on surface layer properties and on selected performance properties of machine parts after such machining but also the influence of superficial cold-work treatment applied after the EDM of EDA on modification of these properties. The investigations included texture of the surface, metallographic microstructure, microhardness distribution, fatigue strength, and resistance to abrasive wear. It was proved that the application of the roto-peen after the EDM and the EDA resulted in lowering roughness height up to 70%, the elevation of surface layer microhardness by 300-700 μHV, and wear resistance uplifting by 300%.

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“…The recast layer is referred as white layer since it is difficult to etch and its appearance under optical microscope is white. Beneath the recast layer, a heat affected zone is formed due to the rapid heating and quenching cycles during the process [2].…”

Section: Introductionmentioning

confidence: 99%

“…

ABSTRACTThe electrical discharge machining (EDM) is a process characterized by high thermal demands, which tend to cause metallurgical changes in the surface of the workpiece [1][2]. This work aims to conduct a discussion of metallurgical changes in the surface of cavities obtained by the process of EDM in the machining of steel.

…”

mentioning

confidence: 99%

Metallurgical alterations in the surface of steel cavities machined by EDM

et al. 2013

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The electrical discharge machining (EDM) is a process characterized by high thermal demands, which tend to cause metallurgical changes in the surface of the workpiece [1][2]. This work aims to conduct a discussion of metallurgical changes in the surface of cavities obtained by the process of EDM in the machining of steel. Several variables were employed, such as cavity depth, electrode geometry and technological parameters of the process. Thus, the goal was to identify the different metallurgical changes that can occur in the machined surfaces. The evaluation of these changes was made from metallographic analysis, measurements of microhardness and of the depth of the layer affected by process. The results of this work identified several metallurgical changes such as formation of white layer, hardness variation and change of microstructure. The occurrence of microcracks also was observed, especially in severe conditions. The greatest variations in results were caused by the change of technological parameters. However, the variation in cavity depth and the change of the electrode geometry also showed influence on the results.

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

Cited by 200 publications

References 14 publications

Experimental study on green electrical discharge machining in tap water of Ti–6Al–4V and parameters optimization

Experimental study on green electrical discharge machining in tap water of Ti–6Al–4V and parameters optimization

Surface Layer Properties after Successive EDM or EDA and Then Superficial Roto-Peen Machining

Metallurgical alterations in the surface of steel cavities machined by EDM

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