Influence of steel type on electrical discharge machined surface integrity

Ghanem, Farhat; Braham, C.; Sidhom, Habib

doi:10.1016/s0924-0136(03)00572-7

Cited by 77 publications

(53 citation statements)

References 14 publications

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“…In the investigation performed by Ghanem et al [22], it has been shown that a tensile residual stress is formed within the EDM transformation layer. Ekmekci et al [23] have developed a modified empirical equation to scale the residual stress in machined surface, and reported that the stress increases from the surface and reaches a maximum value, this maximum stress value is around ultimate tensile strength of the material, and then it falls gradually to zero or even to a small compressive residual stress at greater depths.…”

Section: Hole-drilling Techniquementioning

confidence: 99%

Methods of measuring residual stresses in components

et al. 2012

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Residual stresses occur in many manufactured structures and components. Large number of investigations have been carried out to study this phenomenon and its effect on the mechanical characteristics of these components.Over the years, different methods have been developed to measure residual stress for different types of components in order to obtain reliable assessment. The various specific methods have evolved over several decades and their practical applications have greatly benefited from the development of complementary technologies, notably in material cutting, full-field deformation measurement techniques, numerical methods and computing power. These complementary technologies have stimulated advances not only in measurement accuracy and reliability, but also in range of application; much greater detail in residual stresses measurement is now available. This paper aims to classify the different residual stresses measurement methods and to provide an overview of some of the recent advances in this area to help researchers on selecting their techniques among destructive, semi destructive and non destructive techniques depends on their application and the availabilities of those techniques. For each method scope, physical limitation, advantages and disadvantages are summarized. In the end this paper indicates some promising directions for future developments.

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Section: Hole-drilling Techniquementioning

confidence: 99%

Methods of measuring residual stresses in components

et al. 2012

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“…They concluded that if the electrical discharge energy of material removal rate increases, surface roughness and superficial cracks meaningfully rise and subsequently decrease flexural strength of workpiece. Ghanem et al analysed the effect of pulse current on the surface accuracy of steel types X155CrMoV12 and X2CrNiMo17 in 2003 [10]. Tomadi et al showed that the quality of the workpiece surface machined by EDM is significantly dependent on the energy of each spark by doing experiments on surface roughness in the EDM process of tungsten carbide [11].…”

Section: Introductionmentioning

confidence: 99%

Modelling and investigating the effect of input parameters on surface roughness in electrical discharge machining of CK45

2016

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Original scientific paper Electrical discharge machining is an unconventional machining process in which successive sparks are applied to machine the electrically conductive materials. Any changes in electrical discharge machining parameters lead to the pieces with distinct surface roughness. The electrical discharge machining process is well applied for high hardness materials or when it is difficult to use traditional techniques to do material removing. Furthermore, this method is widely applied in industries such as aerospace, automobile, moulding, and tool making. CK45 is one of important steels in industry and electrical discharge machining can be considered as a proper way for its machining because of high hardness of CK45 after thermal operation of the electrical discharge machining process. Optimization of surface roughness as an output parameter as well as electrical discharge machining parameters including current, voltage and frequency for electrical discharge machining of CK45 have been studied using copper tools and kerosene as the dielectric. For such a purpose and to achieve the precise statistical analysis of the experiment results design of experiment was applied while non-linear regression method was chosen to assess the response of surface roughness. Then, the results were analysed by means of ANOVA method and the machining parameters with more effects on the desired outputs were determined. Finally, mathematical model was obtained for surface roughness. Keywords: CK45 steel; current; design of experiments; electrical discharge machining; frequency; non-linear regression; surface roughness Modeliranje i ispitivanje učinka ulaznih parametara na površinsku hrapavost u obradi CK45 električnim pražnjenjemIzvorni znanstveni članak Obrada električnim pražnjenjem je neuobičajeni postupak strojne obrade u kojemu se sukcesivno iskrenje primjenjuje u obradi materijala koji provode elektricitet. Svaka promjena parametara električnog pražnjenja rezultira promjenom površinske hrapavosti uzoraka. Obrada elektičnim pražnjenjem se uspješno primjenjuje kod materijala visoke tvrdoče ili kada se za skidanje čestica teško mogu primijeniti tradicionalne metode. Nadalje, ova se metoda uvelike primjenjuje u aeroindustriji, proizvodnji automobila, oblikovanju, izradi alata. CK45 je važan čelik u industriji i obrada električnim pražnjenjem može se za njega smatrati odgovarajućom zbog postizanja visoke tvrdoće nakon toplinske obrade postupkom električnog pražnjenja. Optimizacija površinske hrapavosti kao izlazni parametar kao i parametri postupka električnim pražnjenjem uključujući struju, napon i frekvenciju, analizirani su primjenom alata od bakra i kerozena kao dielektrika. U tu svrhu, te kako bi se postigla uspješna statistička analiza eksperimentalnih rezultata, primijenjen je plan pokusa te ne-linearna metoda regresije za procjenu površinske hrapavosti. Zatim su se rezultati analizirali pomoću metode ANOVA te odredili parametri obrade s više učinka na željeni rezultat. Na kraju, dobiven je matematički model za po...

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“…Numerical studies of thermal aspects of the EDM have been developed for different types of thermal loading and different types of machined materials. Shuvra et al [4] and Ghanem et al [5] used a heat source disc with a constant radius whereas Schuse et al [6] and Yadav et al [7] adopted a heat source Gaussian distribution. All these studies confirm that:…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the microstructural and mechanical properties of the remaining layers will undergo changes as reported in the literature [1,2,5,6,[8][9][10]. Numerous studies have been devoted to the identification of metallurgical transformations on the surface and subsurface layers of different materials machined by this process:…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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Influence of steel type on electrical discharge machined surface integrity

Cited by 77 publications

References 14 publications

Methods of measuring residual stresses in components

Methods of measuring residual stresses in components

Modelling and investigating the effect of input parameters on surface roughness in electrical discharge machining of CK45

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

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