Surface modification of titanium alloy using hBN powder mixed dielectric through micro-electric discharge machining

Sharma, Dipti; Mohanty, Shalini; Das, Alok Kumar

doi:10.1016/j.surfcoat.2019.125157

Cited by 64 publications

(29 citation statements)

References 56 publications

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“…The problems of high rate of tool wear and residual stresses on workpiece that are associated with conventional machining are controlled to a higher degree. However, incidence of heat affected zone and recast layers have been reported in electric discharge machining [107,108] as well as laser beam machining [109]. This is because materials removal in LBM and EDM processes is achieved by melting and evaporation.…”

Section: Non-conventional Machiningmentioning

confidence: 99%

“…This is because materials removal in LBM and EDM processes is achieved by melting and evaporation. Figure 8 shows the recast layers formed on the surface of Ti-3Al-2.5V subjected to powder mixed dielectric micro-EDM [108]. The major advantage of non-conventional machining processes is that machining of any hardto-cut metal to high accuracy is possible regardless of the complexity of the shape.…”

Section: Non-conventional Machiningmentioning

confidence: 99%

“…Recast layers shown in scanning electron images of Ti-6Al-4V subjected to mixed powder dielectric during micro-EDM at different concentrations (a) 6 g/l, (b) 8 g/l, (c)10 g/l and (d) 12 g/l, reuse with permission from Elsevier, Sharma et al[108].…”

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confidence: 99%

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An overview of conventional and non-conventional techniques for machining of titanium alloys

et al. 2020

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Machining is one of the major contributors to the high cost of titanium-based components. This is as a result of severe tool wear and high volume of waste generated from the workpiece. Research efforts seeking to reduce the cost of titanium alloys have explored the possibility of either eliminating machining as a processing step or optimising parameters for machining titanium alloys. Since the former is still at the infant stage, this article provides a review on the common machining techniques that were used for processing titanium-based components. These techniques are classified into two major categories based on the type of contact between the titanium workpiece and the tool. The two categories were dubbed conventional and non-conventional machining techniques. Most of the parameters that are associated with these techniques and their corresponding machinability indicators were presented. The common machinability indicators that are covered in this review include surface roughness, cutting forces, tool wear rate, chip formation and material removal rate. However, surface roughness, tool wear rate and metal removal rate were emphasised. The critical or optimum combination of parameters for achieving improved machinability was also highlighted. Some recommendations on future research directions are made.

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Section: Non-conventional Machiningmentioning

confidence: 99%

Section: Non-conventional Machiningmentioning

confidence: 99%

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An overview of conventional and non-conventional techniques for machining of titanium alloys

et al. 2020

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“…Although micro EDM has been widely used in aeroengine manufacturing, its application and development are seriously restricted by its low efficiency and poor surface quality. Improving the machining efficiency of micro EDM is often at the cost of sacrificing the machined surface quality, resulting in the machined surface being too rough to meet the surface quality requirements of key structures of aeroengineering [7][8][9]. In order to further improve the machining efficiency on the premise of ensuring the machined surface quality of micro EDM, particle mixed electrical discharge machining (PMEDM) technology has been studied by lots of scholars [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Processing TC4 with Nano Particle Surfactant Mixed Micro EDM

Liu

Chen³

et al. 2021

Materials

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Micro electrical discharge machining (micro EDM) is able to remove conductive material by non-contact instantaneous high temperature, which is more suitable for machining titanium and its alloys compared with traditional machining methods. To further improve the machining efficiency and machined surface quality of micro EDM, the nano particle surfactant mixed micro EDM method is put forward in this paper. Experiments were conducted to explore the effect of nano particle surfactant on the micro EDM performance of titanium alloy. The results show that the material removal rate of micro EDM in dielectric mixed with TiO2 is the highest when open-circuit voltage is 100 V, followed by Al2O3 and ZrO2. Lower tool wear rate can be produced by using dielectric mixed with nano particle surfactant. The taper ratio of micro EDM in dielectric mixed with nano particle surfactant is higher than that in deionized water. The surface roughness Ra of micro EDM in dielectric mixed with TiO2 can be 50% lower than that in deionized water. It is helpful to improve the machining performance by adding surface surfactant in the dielectric of micro EDM.

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“…14 In the recent scenario, electric discharge machining (EDM) is one of the prominent techniques to machine the material with high precision and modify the substrate surface simultaneously. [15][16][17] In this method, the formation of intermetallic compounds by the reaction of the workpiece and electrode takes place in the presence of the dielectric medium, which results in the alteration of workpiece material properties. [18][19][20] For instance, Bains et al 21 reported the surface modification of the Ti-6Al-4V surface using EDM and revealed that EDM is a good alternative to other pricy surface modification methods for the treatment of the bare metal surface.…”

Section: Introductionmentioning

confidence: 99%

EDM performance characteristics and electrochemical corrosion analysis of Co-Cr alloy and duplex stainless steel: A comparative study

Mahajan

Singh²,

Devgan

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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Cobalt-chromium alloy (F-90) and duplex stainless steel (DSS-2205) belong to the family of metallic biomaterials, which are frequently used for the manufacture of dental prosthetics, artificial implants including knee and hip joints. This article addresses the investigation highlights of electrical discharge machining (EDM) of Co-Cr alloy and duplex stainless steel using different electrode materials for the evaluation of optimum machining parameters. The samples with superior machining performance and surface integrity were analyzed by electrochemical corrosion testing and found that the EDM treated samples portrayed a notable improvement in the corrosion resistance compared to bare metal. Our results demonstrated that both the substrates i.e. Co-Cr alloy and DSS-2205 were dominantly affected by the intensity of the applied current, and participated in the material removal rate with a contribution of 93.81% (23.37 mm3/min., Co-Cr alloy) and 87.32% (39.76 mm3/min., DSS-2205) respectively. However, the surface roughness of the machined Co-Cr alloy (1.080 µm) was majorly influenced by the current (contribution: 67.24%) and electrode (contribution: 28.27%). Whereas, pulse-on (contribution: 58.37%) and electrode (contribution: 30.52%) were significant for the surface roughness (1.150 µm) of the machined DSS-2205. Moreover, the machined surface also demonstrates the porosity (∼3 to ∼5 µm) and formation of intermetallic oxides, carbon phases on the samples machined at a higher value of current i.e. 16 Ampere. Field emission scanning electron microscopy and X-ray diffractometer were used to scrutinize the surface topography and compositional analysis of the machined substrates. The alternation of the substrate surface observed helpful in enhancing the corrosion resistance of Co-Cr alloy and duplex stainless steel by 80.88% (corrosion rate: 0.00029 mm/year) and 96% (corrosion rate: 0.00763 mm/year), comparative to their respective untreated samples.

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Surface modification of titanium alloy using hBN powder mixed dielectric through micro-electric discharge machining

Cited by 64 publications

References 56 publications

An overview of conventional and non-conventional techniques for machining of titanium alloys

An overview of conventional and non-conventional techniques for machining of titanium alloys

An Experimental Study on Processing TC4 with Nano Particle Surfactant Mixed Micro EDM

EDM performance characteristics and electrochemical corrosion analysis of Co-Cr alloy and duplex stainless steel: A comparative study

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