Recast layer removal of 304 stainless steel by combining micro-EDM with negative polarity micro-EDM

Xu, Bin; Chen, Sheng-gui; Liang, Xiong; Lei, Jianguo; Shi, Huaizhong; Fu, Lianyu; Yang, Jun; Peng, Tai-jiang; Zhao, Hang; Zhu, Likuan

doi:10.1007/s00170-020-05312-y

Cited by 19 publications

(4 citation statements)

References 17 publications

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“…This remelted and rapidly cooled surface layer was characterized by a different value of activation energy than the area which was not influenced by the WEDM process. That is why it was gradually de-etched and finally entirely disappeared over the course of the cleaning and then the exposure to corrosion, as described in a study conducted by Xu [34]. Minor fissures could be observed on the surface as a result of the voltage release, or more precisely, the corrosion products.…”

Section: Subsurface Layer Analysismentioning

confidence: 94%

The Corrosion Behavior of WEDM Machined Stainless Steels in a Pyrolysis Environment

Beneš

Mouralová

Midula

et al. 2023

Metals

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Pyrolysis represents one of the most convenient technologies for the chemical transformation of waste. The exposure to corrosion products and high temperatures does, however, require chemically resistant construction materials. This study was carried out to analyze the corrosion behavior of 1.4571 (AISI 316Ti) and 1.4305 (AISI 303) stainless steels machined with wire electric discharge machining (WEDM) in a pyrolysis environment. Different machining parameters were used for both materials tested to examine the influence of WEDM machining. The total testing time in the pyrolysis environment was 28 days, with the testing chamber being refilled 12 times. The surface topography was analyzed following the WEDM, cleaning, and corrosion test. The surface morphology and cross-section analyses were carried out using electron microscopy at all three stages of the process. An analysis of the chemical composition of the surfaces was carried out as well as of the pyrolysis environment to which the samples were exposed. It was established that the organic acids found in the pyrolysis chamber did not degrade the tested stainless steels to a meaningful degree. Minor fissures, that is, fine precipitated carbides, were observed on the surface of both the steel types and in their subsurface layer, as well as a significant presence of carbon. This presence was directly connected to the impurities found on the surface after the removal from the test furnace that were probably of a protective or passivation nature.

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Section: Subsurface Layer Analysismentioning

confidence: 94%

The Corrosion Behavior of WEDM Machined Stainless Steels in a Pyrolysis Environment

Beneš

Mouralová

Midula

et al. 2023

Metals

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“…The deburring performance was evaluated based on the material removal rate and surface roughness. Xu et al [19] investigated recast layer removal in 304 stainless steel using a novel approach that combines micro-EDM with negative polarity micro-EDM and reported a surface quality enhancement and recast layer elimination in EDM. Laser scanning confocal microscopy results show the surface roughness of the components to be reduced by up to 0.57 µm.…”

Section: Literature Reviewmentioning

confidence: 99%

Optimizing the Electrical Discharge Machining Process Parameters of the Nimonic C263 Superalloy: A Sustainable Approach

Shastri,

Mohanty,

Mishra

et al. 2024

JMMP

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Engineers continue to be concerned about electrical discharge-machined components’ high energy consumption, machining debris, and poor dimensional precision. The aim of this research is to propose a hybrid neuro-genetic approach to improve the machinability of the electrical discharge machining (EDM) of the Nimonic C263 superalloy. This approach focuses on reducing the energy consumption and negative environmental impacts. The material removal rate (MRR), electrode wear ratio (EWR), specific energy consumption (SEC), surface roughness (Ra), machining debris (db), and circularity (C) are examined as a function of machining parameters such as the voltage (V), pulse on time (Ton), current (I), duty factor (τ), and electrode type. By employing the VIKOR method, all the responses are transformed into a distinctive VIKOR index (VI). Neuro-genetic methods (a hybrid VIKOR-based ANN-GA) can further enhance the best possible result from the VIKOR index. During this step, the hybrid technique (VIKOR-based ANN-GA) is used to estimate an overall improvement of 9.87% in the response, and an experiment is conducted to confirm this condition of optimal machining. This work is competent enough to provide aeroengineers with an energy-efficient, satisfying workplace by lowering the machining costs and increasing productivity.

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“…However, the instantaneous high temperature exceeding 6000 K can be generated in the discharge area, which can melt or even vaporize the material on the tool electrode and the surface of the workpiece [5][6][7]. Melted or even vaporized metal is thrown into the fluid under the action of explosive force, and solidifies into metal debris after cooling [8,9]. However, in the process of material melting and gasification, a number of reactants, such as aerosols and toxic gas, are generated in the mineral oil dielectric.…”

Section: Introductionmentioning

confidence: 99%

Research on EDM Performance of Renewable Dielectrics under Different Electrodes for Machining SKD11

et al. 2022

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Electrical discharge machining (EDM) is a non-traditional process, which can cut materials with a high melting point, high hardness, high strength, and low brittleness. However, the kerosene (dielectric of EDM) produces aerosols and toxic gases at high temperatures, which seriously affect the health of operators and air quality. This means that it is not conducive to the green manufacturing and sustainable development of EDM. In this study, thereafter, sunflower seed oil (SSO) and kerosene were used as dielectrics of EDM for machine SKD11, and the machining performance of the two dielectrics under different current, duty ratio, pulse duration and electrodes were comparatively analyzed, such as material remove rate (MRR), surface roughness (Ra), energy efficiency per volume (EEV) and exhaust emissions characteristics (EEC). This investigation found that the minimum value of EEV in SSO was 0.3879 kJ/mm3, which was about 25% lower than the minimum value of 0.4849 kJ/mm3 in kerosene. The emission rate of Cu electrode in SSO was 62.017 µg/min, which was lower than that in 78.857 µg/min, decreasing by about 21.36%, in kerosene. In addition, a super depth of field optical micro-scope was subsequently used in the experiments to observe the diameter of the debris. The results indicated that SSO has a larger proportion of debris of more than 35 µm in diameter. Therefore, SSO can be adopted as a substitute for kerosene dielectric to improve the sustainability of electrical discharge machining and realize green manufacturing.

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Recast layer removal of 304 stainless steel by combining micro-EDM with negative polarity micro-EDM

Cited by 19 publications

References 17 publications

The Corrosion Behavior of WEDM Machined Stainless Steels in a Pyrolysis Environment

The Corrosion Behavior of WEDM Machined Stainless Steels in a Pyrolysis Environment

Optimizing the Electrical Discharge Machining Process Parameters of the Nimonic C263 Superalloy: A Sustainable Approach

Research on EDM Performance of Renewable Dielectrics under Different Electrodes for Machining SKD11

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