High-efficiency finishing process for metal mold by large-area electron beam irradiation

Uno, Yoshiyuki; Okada, Akira; Uemura, Kensuke; Raharjo, Purwadi; Furukawa, Toshihiko; Karato, Kosaku

doi:10.1016/j.precisioneng.2004.12.005

Cited by 113 publications

(36 citation statements)

References 2 publications

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“…The EDM surface corrosion resistance has encountered little interest [19][20][21][22][23] despite of its importance for many applications of metallic components manufactured by this process and used in more or less aggressive environments typically in aerospace, nuclear power plant and biomedical dental implant industries [1][2][3][24][25][26][27][28]. Furthermore, the available data on the corrosion resistance of finished surface by EDM is incomplete and sometimes controversial to provide any meaningful conclusion.…”

Section: Introductionmentioning

confidence: 99%

“…They also show that corrosion resistance is significantly improved when defects such as micropores, cracks and discharge craters in the white layer are removed by a special EDM electrode and burnishing by ZrO 2 balls. However, Uno et al [21] show that surfaces of low-alloyed steel C (0.15 %), Ni (3 %), Al (1 %) and Cu (1 %), machined by electron beam with large irradiated area have greater resistance to corrosion than surfaces obtained by EDM or by grinding. Authors explain this result by the absence of the white layer and low surface roughness obtained by an electron beam at optimised operating conditions.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…The diameter of the beam is 60 mm; with a pulse interval of 11 seconds, pulse time of 2-3 µs and energy density <10 J/cm 2 . Within the 60 mm diameter, energy density is expected to be uniform [17], thereby ensuring the whole sample surface in this case is uniformly irradiated. The electron beam irradiation parameters used in this work are summarised in Table 1 …”

Section: Large Area Electron Beam Surface Treatmentmentioning

confidence: 99%

“…Due to the short pulse duration (2~3 μs [17]), the melted surface will rapidly cool and solidify through heat transfer to the underlying bulk. It has been estimated that pulsed electron beam irradiation can obtain a cooling rate between 10 7 to 10 9 K/s [25][26][27].…”

Section: Crackingmentioning

confidence: 99%

“…Over the past decade, LAEB has been applied to polish and improve the corrosion behaviour of mould surfaces [17][18][19], improve surface hardness in steels and magnesium alloys [20], as well as the wear resistance of Al-Si alloys [21,22]. More relevant to the current work, Guan et al [23] have observed localised amorphisation in a simple low-carbon steel by this process, giving evidence that the high-cooling rates associated with this technique can be applied for amorphous layer preparation.…”

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confidence: 99%

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Amorphous layer formation in Al86.0Co7.6Ce6.4 glass-forming alloy by large-area electron beam irradiation

Murray

Voisey

et al. 2013

Applied Surface Science

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Amorphous Al-Co-Ce alloys are of interest because of their resistance to corrosion, but high cooling rates are generally required to suppress the formation of crystalline phases. In this study, the surface of a bulk crystalline Al-Co-Ce alloy of a glass-forming composition was treated using large area electron beam (LAEB) irradiation. Scanning electron microscopy shows that, compared to the microstructure of the original crystalline material, the treated surface exhibits greatly improved microstructural and compositional uniformity. Glancing angle X-ray diffraction conducted on the surface of treated samples indicates the formation of the amorphous phase following 25 and 50 pulses at 35 kV cathode voltage. However, when the samples are treated with 100 and 150 pulses at 35 kV cathode voltage of electron beam irradiation, the treated layer comprises localised crystalline regions in an amorphous matrix.In addition, the formation of cracks in the treated layer is found to be localised around the Al 8 Co 2 Ce phase in the bulk material. Overall, crack length per unit area had no clear change with an increase in the number of pulses.

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Electrothermal Cutting Process

Mahamood

Akinlabi

2018

Advanced Noncontact Cutting and Joining Technologies

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High-efficiency finishing process for metal mold by large-area electron beam irradiation

Cited by 113 publications

References 2 publications

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

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

Amorphous layer formation in Al86.0Co7.6Ce6.4 glass-forming alloy by large-area electron beam irradiation

Electrothermal Cutting Process

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