Персона:
Щекин, Александр Сергеевич

Организационные подразделения

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Институт лазерных и плазменных технологий

Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.

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Щекин

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Александр Сергеевич

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Microstructure and mechanical properties of stainless steel 316L obtained by Direct Metal Laser Deposition
(2019) Bykovskiy, D. P.; Ishkinyaev, E. D.; Petrovskiy, V. N.; Osintsev, A. V.; Dzhumaev, P. S.; Polskiy, V. I.; Sergeev, K. L.; Shchekin, A. S.; Быковский, Дмитрий Петрович; Ишкиняев, Эмиль Дамирович; Петровский, Анатолий Николаевич; Осинцев, Андрей Вениаминович; Джумаев, Павел Сергеевич; Польский, Валерий Игоревич; Щекин, Александр Сергеевич
© Published under licence by IOP Publishing Ltd.The microstructure of 316L stainless steel obtained by layer-by-layer direct metal laser deposition is reviewed. Mechanical tests of the samples were performed in accordance with GOST 1497-84. Studies show that changes in power of laser radiation to grow parts lead to changes in their mechanical properties. The research shows dependencies between the strength characteristics of materials and the power of laser radiation. Causes of the forementioned changes are studied through the analysis of the microstructure. Nanosized inclusions of spherical shape were found in the process of studying the microstructure of materials. A study in the nature of the formation of these inclusions and their effect on the properties of the obtained material was performed.
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Pulsed laser modification of Al2O3 ceramics to controlling the surface wettability
(2021) Gavrikov, A. A.; Shchekin, A. S.; Glazyrina, S. A.; Zhanabaeva, A. K.; Kolchina, A. A.; Marin, D. V.; Petrovskiy, V. N.; Ishkinyaev, E. D.; Щекин, Александр Сергеевич; Марин, Денис Васильевич; Петровский, Анатолий Николаевич; Ишкиняев, Эмиль Дамирович
© 2021 Institute of Physics Publishing. All rights reserved.In this paper nanosecond direct laser structuring was investigated for the surface modification of Al2O3 ceramic. A theoretical calculation of the roughness index was carried out according to the Cassie-Baxter model for three different patterns formed on the ceramic surface. The relationship between the assumed area of contact of a water drop with the surface of the material and the contact angle of wetting was investigated. This study shows that surface topography is not the only key factor responsible for surface wettability during nanosecond direct laser structuring.
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Study of Mechanical Characteristics of Stainless Steel Samples Obtained by Direct Laser Deposition
(2019) Ishkinyaev, E. D.; Petrovskiy, V. N.; Polskiy, V. I.; Dzhumaev, P. S.; Sergeev, K. L.; Shchekin, A. S.; Panov, D. V.; Ushakov, D. V.; Ишкиняев, Эмиль Дамирович; Петровский, Анатолий Николаевич; Польский, Валерий Игоревич; Джумаев, Павел Сергеевич; Щекин, Александр Сергеевич
© 2019, Pleiades Publishing, Ltd.The paper presents the results of mechanical tensile tests and microhardness of samples obtained from stainless steel 316L powder by direct laser deposition. The strength characteristics of the deposited samples are better than those of rolled ones obtained in the traditional way. The material strength is reduced and its plasticity is increased with the growth of the laser radiation power during deposition. The obtained regularities are explained by analysis of the microstructure. It is found that the hardness of the cladding is substantially higher than that of the substrate material with the corresponding composition. This is a consequence of hardening of each layer during deposition of the next layer and formation of nanosized spherical inclusions representing oxides of metals that make up the powder in the sample bulk. The density of these particles affects the overall hardness of the material and depends on the radiation power supplied. Individual properties of the material for various applications can be modified by appropriate selection of technological parameters of the printing process.
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Modeling of laser surface modification processes of tool steel to predict the temperature distribution and modification zone
(2021) Khriptovich, E. V.; Shiganov, I. N.; Gavrikov, A. A.; Ishkinyaev, E. D.; Voronov, V. D.; Petrovskiy, V. N.; Shchekin, A. S.; Ишкиняев, Эмиль Дамирович; Воронов, Валерий Дмитриевич; Петровский, Анатолий Николаевич; Щекин, Александр Сергеевич
© 2021 Institute of Physics Publishing. All rights reserved.Process of metal surface modification during laser treatment requires a long search and control of the treatment technological parameters, depending on the technical requirements imposed on it. The article proposes a method of mathematical modeling of heat transfer during laser processing of the high carbon steel 9HS (equivalent to DIN 150Cr14). The dimensions of the hardening area are calculated with high accuracy by the isotherm of the critical temperature Ac3. The influence of the main technological parameters (radiation power, laser spot diameter, processing speed) on the depth and width of the hardening zone is shown. The paper also presents the use of the build model for the selection of multitrack processing modes to harden high-carbon steel 9HS to the required depth without surface melting.
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Laser welding of borosilicate glass using by femtosecond fiber lasers
(2022) Murzakov, M. A.; Evtikhiev, N. N.; Oreshkin, A. A.; Schekin, A. S.; Kataev, D. M.; Евтихиев, Николай Николаевич; Щекин, Александр Сергеевич
The work shows the principal possibility laser welding borosilicate glass using by IPG Photonics femtosecond fiber lasers. The main physical mechanisms of laser glass welding are considered. It is shown that laser welding of glass or transparent dielectrics is based on the mechanisms of nonlinear absorption high-intensity laser radiation. The main technological features of the process laser welding of borosilicate glass are demonstrated. Shear lap tests of the obtained welds were carried out, the load was over 100 MPas. © 2022 IEEE.
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Determination of the Diameter and Depth of Substance Ablation Craters during Nanosecond Laser Pulses Using Computer Modeling
(2022) Shchekin, A. S.; Petrovskiy, V. N.; Gavrikov, A. A.; Marin, D. V.; Ivanov, A. A.; Щекин, Александр Сергеевич; Петровский, Анатолий Николаевич; Марин, Денис Васильевич; Иванов, Андрей Анатольевич
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Direct nanosecond laser metallization of AlN ceramics
(2024) Sviridova, A. A.; Shchekin, A. S.; Petrovskiy, V. N.; Ivanov, A. A.; Berdnikova, M. M.; Свиридова, Ангелина Алексеевна; Щекин, Александр Сергеевич; Петровский, Анатолий Николаевич; Иванов, Андрей Анатольевич; Бердникова, Мария Михайловна
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Effect of burst mode modulation ultrashort pulse laser on the laser processing transparent dielectrics
(2024) Murzakov, M. A.; Evtikhiev, N. N.; Grezev, N. V.; Shchekin, A. S.; Евтихиев, Николай Николаевич; Щекин, Александр Сергеевич