Special Features of Electron-Beam Alloying of Replaceable Polyhedral Hard-Alloy Plates Under a Complex Surface Treatment

Fedorov, S. Yu.; Oganyan, Gaik

doi:10.1007/s11041-016-9932-8

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…The experimental results demonstrated the feasibility of creating wear-resistant near-surface layers by electron-beam technology using a source of wide-aperture low-energy high-current electron beam (LEHCEB) [1]. Such layers were obtained by initiating exothermic chemical reactions between the substrate material and the film deposited on it with the formation of new phase components [2][3][4].…”

Section: Introductionmentioning

confidence: 93%

Control of the surface electron-beam alloying process by vibration monitoring

Fedorov¹,

Kozochkin²,

Stebulyanin³

2018

Mechanics & Industry

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The experimental results prove the ability to realize technology of chemical heat treatment of some materials by surface alloying using a wide-aperture low-energy high-current electron beam. Doped hardened layers were produced due to initiating exothermic chemical reactions between the base and the thin film covered on it. Nevertheless, it is quite difficult to control the process of surface electron-beam alloying due to the significant variation in the parameters of the microsecond electron beam pulse and the instability of its interaction with the processed material. It leads to significant random changes that occur spontaneously, regardless of the control system. In this situation, it is proposed to use the method based on monitoring of oscillations and acoustic emission, which has long proved to be an effective tool in the study of phase transformations and plastic deformation. The appearance of a process with high vibroacoustic activity under irradiation of plates made of pre-nitrated steel 08Cr17Ti with a deposited film Nb70Hf22Ti8 in the range of 11–22 kHz 10 ms after the electronic pulse was experimentally shown on this background. The source of this vibroacoustic signal is a change in the microstructure of the alloy, including the appearance of a martensitic component in the near-surface layer of the sample caused by the formation of nitride based on niobium. Tracking changes in the effective value of the vibroacoustic signal allow choosing the rational modes of irradiation with electron-beam surface alloying, involving the supply of maximum power, limited by the possibility of evaporation of the film with alloying components.

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Section: Introductionmentioning

confidence: 93%

Control of the surface electron-beam alloying process by vibration monitoring

Fedorov¹,

Kozochkin²,

Stebulyanin³

2018

Mechanics & Industry

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“…A separate scientific direction has been formed related to improving abrasive processing strategies, the characteristics of diamond tools, and optimizing diamond grinding modes to reduce roughness and increase crack resistance to solve the problem of minimizing defects in the surface layer of ceramic products [21][22][23][24]. One of the common approaches proposed by various researchers to reduce the defectiveness level in the surface layer formed on the surface of ceramics during diamond grinding is polishing as a finishing operation in the technological cycle of manufacturing ceramic products [25][26][27]. For example, the authors of this study demonstrated in a previous work that the use of additional finishing and polishing greatly reduces the index of defectiveness of the surface layer of samples made of Al 2 O 3 /TiC and SiAlON ceramics [28].…”

Section: Introductionmentioning

confidence: 99%

Technological Principles of Complex Plasma-Beam Surface Treatment of Al2O3/TiC and SiAlON Ceramics

Grigoriev,

Volosova,

Lyakhovetsky

et al. 2023

JMMP

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Thermomechanical action during high-performance diamond grinding of sintered cutting Al2O3/TiC and SiAlON ceramics leads to increased defectiveness of the surface layer of the deposited TiZrN and CrAlSiN/DLC coatings. It predetermines the discontinuous and porous coatings and reduces its effectiveness under abrasive exposure and fretting wear. The developed technological approach is based on “dry” etching with beams of accelerated argon atoms with an energy of 5 keV for high-performance removal of defects. It ensures the removal of the defective layer on ceramics and reduces the index of defectiveness (the product of defects’ density per unit surface area) by several orders of magnitude, compared with diamond grinding. There are no pronounced discontinuities and pores in the microstructure of coatings. Under mechanical loads, the coatings ensure a stable boundary anti-friction film between the ceramics and counter body that significantly increases the wear resistance of samples. The treatment reduces the volumetric wear under 20 min of abrasive action by 2 and 6 times for TiZrN and CrAlSiN/DLC coatings for Al2O3/TiC and by 5 and 23 times for SiAlON. The volumetric wear under fretting wear at 105 friction cycles is reduced by 2–3 times for both coatings for Al2O3/TiC and by 3–4 times for SiAlON.

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“…Similar results were obtained using chemical and thermal methods of pretreatment. In this case, plasma nitriding [13][14][15], including ion-assisted nitriding [16,17], and surface alloying [18,19] are often used. It was found that such treatment improves the physicochemical characteristics of the substrate and its chemical affinity with the deposited material, as well as eliminates the sharp interface of separation between a relatively soft substrate and a hard coating.…”

Section: Introductionmentioning

confidence: 99%

The formation of the cutting tool microgeometry by pulsed laser ablation

Fedorov

Ostrikov

Mustafaev

et al. 2018

Mechanics & Industry

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Laser ablation is considered as an alternative to other methods that allow precise processing of various tool materials and work with both the base material and thin films of wear-resistant coatings. This article presents an investigation of the possibility of setting the microgeometry of the surface of cutting tool made of high-speed steel M2 and hard alloy WCCo3 using ablation with nanosecond infrared marking Nd:YVO4 laser. Dependencies of the width and depth of the resulting tracks on the specified laser power are obtained. It was revealed that their depth depends on a set of several specified factors: power, scanning speed, pulse frequency rate, and a number of passes. The modes with a radiation power of up to 70% are of interest for the treatment of the tool surface using a laser because they have a more predictable profile and more efficient energy distribution. The most uniform and smooth surface were obtained after laser treatment with the following parameters: power 60%, frequency 10 kHz, scanning speed 200 mm/s irrespective of the material being processed. The greater flexibility of the coating material for laser processing was observed. The depth of tracks on the coated (TiAl)N samples is larger than on the uncoated samples. The possibility to obtain a chamfer with the specified width and angle parameters by laser processing based on the obtained dependencies is demonstrated.

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Special Features of Electron-Beam Alloying of Replaceable Polyhedral Hard-Alloy Plates Under a Complex Surface Treatment

Cited by 7 publications

References 4 publications

Control of the surface electron-beam alloying process by vibration monitoring

Control of the surface electron-beam alloying process by vibration monitoring

Technological Principles of Complex Plasma-Beam Surface Treatment of Al2O3/TiC and SiAlON Ceramics

The formation of the cutting tool microgeometry by pulsed laser ablation

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