Персона: Петровский, Анатолий Николаевич
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Институт интеллектуальных кибернетических систем
Цель ИИКС и стратегия развития - это подготовка кадров, способных противостоять современным угрозам и вызовам, обладающих знаниями и компетенциями в области кибернетики, информационной и финансовой безопасности для решения задач разработки базового программного обеспечения, повышения защищенности критически важных информационных систем и противодействия отмыванию денег, полученных преступным путем, и финансированию терроризма.
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Руководитель научной группы "Исследовательский центр в сфере искусственного интеллекта по направлению «Транспорт и логистика»
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Петровский
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Анатолий Николаевич
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23 results
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- ПубликацияТолько метаданныеSurface changes in Al2O3–base composite ceramics under action of laser treatment(2019) Vlasova, M.; Kakazey, M.; Hernandez, A. C.; Aguilar, P. A. M.; Petrovsky, V. N.; Петровский, Анатолий Николаевич© 2018 Elsevier Ltd and Techna Group S.r.l. Features of the structural-phase reconstruction of the surface remelted layer (track) of ceramic specimens with different contents of Y2Ti2O7, Y3Al5O12, and Al2O3 under the action of directional laser heating have been investigated by the XRD, ATR-FTIR, EDS, and AFM methods. It has been established that, depending of the treatment mode (the irradiation power and traverse speed of the laser beam), the phase composition of the remelted layer changes as compared to that of the volume part of the ceramic specimen, and, as a result of the dissociation of predominantly Y3Al5O12 and Y2Ti2O7, cavities and asperities appear. High-temperature laser heating and the presence of a temperature gradient in tracks leads to an intensive ablation process from the surface of the tracks, as a result of which the surface layer of the tracks is depleted of the lower-melting components with a (Y2Ti2O7) and is enriched in more refractory components (Al2O3). A part of the ablation products is deposited in the form of oxides on the surface of tracks. The obtained results make it possible to represent a multilayer model of ceramics subjected to laser treatment: the ceramic volume proper with a specific phase composition → remelted volume layer with a changed phase composition → surface layer with a new changed phase composition, and deposited ablation products. The thickness of the layers depends on the irradiation mode, and clear-cut boundaries between them are absent.
- ПубликацияТолько метаданныеPeculiarities of the Microstructure and Properties of Parts Produced by the Direct Laser Deposition of 316L Steel Powder(2019) Loginova, I. S.; Solonin, A. N.; Prosviryakov, A. S.; Cheverikin, V. V.; Bykovskiy, D. P.; Petrovskiy, V. N.; Быковский, Дмитрий Петрович; Петровский, Анатолий НиколаевичThe direct laser deposition of metal powders is one additive method of producing functional materials. It consists of the melting of metallic powders by a laser beam in inert gas. The main process parameters are the laser-beam power, laser-beam speed and scanning trajectory, and powder consumption. Each parameter is selected depending on the alloy type, which in totality affects the structure and defect formation in products. In this study, experimental rectangular samples of 316L austenitic steel are fabricated by the direct laser deposition of the powder. The microstructure and fractures of samples are investigated using scanning electron microscopy in order to determine the structural features and reveal the defects (pores, holes, crystallization cracks, and oxide inclusions). Uniaxial tension tests and hardness tests are performed. The analysis of the influence of the laser beam scanning trajectory on the microstructure and properties of samples during melting is performed. It is found that a dispersed structure with an average crystallite size of 1.3-1.9 m is formed at a laser power of 250 W and scanning rate of 16 mm/s, which results in a high level of mechanical properties of experimental samples. It is shown that, when using the lengthwise laser-beam trajectory (along the largest sample size), the tensile strength reaches 730 MPa with a relative elongation of 25%, which exceeds the level of mechanical properties of 316L steel by 110 MPa.
- ПубликацияТолько метаданныеAnomalous Electrical Conductivity and Magnetization in Fe-Cr-Ni Austenite-Martensite Alloys(2019) Protasov, E. A.; Petrovskii, V. N.; Mironov, V. D.; Протасов, Евгений Александрович; Петровский, Анатолий Николаевич; Миронов, Владимир ДмитриевичWe have measured the temperature dependence of the resistivity and magnetization of a special steel of the Fe-Cr-Ni austenite-martensite class in a wide temperature range (77-1100 K). It is found that at temperatures 77-170 K, the resistivity of the material almost remains unchanged, but upon a further increase in temperature, the resistivity sharply increases, which is probably a result of disordering. In addition, anomalous behavior of resistivity with vanishing spontaneous magnetization is observed at 910 K, which is associated with the ferromagnet-paramagnet phase transition. Comparison of the measured (T) dependence with the analogous dependence for 12Kh18N10T austenite stainless steel has not revealed features typical of Fe-Cr-Ni steel.
- ПубликацияТолько метаданныеStudy 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.
- ПубликацияТолько метаданныеEffect of Laser Treatment on γ-Phase Strength Characteristics in Iron–Chrome–Nickel System Alloys(2021) Blinova, E. N.; Libman, M. A.; Pimenov, E. V.; Umnov, P. P.; Petrovskij, V. N.; Петровский, Анатолий Николаевич© 2021, Allerton Press, Inc.Abstract: A study is performed of the effect intense laser heating has on the strength characteristics of the γ‑phase in iron–chromium–nickel alloys. We show that using laser radiation to heat the initial α-phase to the temperature of the α → γ transformation produces a γ-phase with much higher microhardness and yield stress than those of the equilibrium γ-phase. A possible mechanism of this phenomenon is discussed.
- ПубликацияТолько метаданныеModeling 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.
- ПубликацияТолько метаданныеDetermining the Size of the Hardening Zone by Temperature Fields during Laser Processing(2022) Ishkinyaev, E. D.; Khriptovich, E. V.; Voronov, V. D.; Petrovskiy, V. N.; Shiganov, I. N.; Ишкиняев, Эмиль Дамирович; Воронов, Валерий Дмитриевич; Петровский, Анатолий Николаевич
- ПубликацияТолько метаданныеPore healing effect of laser polishing and its influence on fatigue properties of 316L stainless steel parts fabricated by laser powder bed fusion(2022) Panov, D.; Oreshkin, O.; Voloskov, B.; Petrovskiy, V.; Shishkovsky, I.; Петровский, Анатолий НиколаевичPotential application of the additive manufactured (AM) parts is still inhibited by poor fatigue properties. In this work, we applied laser polishing to simultaneously reduce factors that affected the fatigue properties, such as surface roughness and sub-surface porosity. Our findings show that significant porosity reduction in sub-surface area can be achieved with one scan pass without major deterioration of surface quality. The surface quality, sub-surface layer porosity and mechanical properties of the laser polished with pore removing pass and conventionally laser polished samples are compared with as-built samples. Sub-surface porosity reduction effect mainly depends on remelted layer depth. Thus the porosity reduction up to 90% in the sub-surface layer can be achieved. The surface quality of the samples is evaluated by Scanning Electron Microscopy, Optical and Stylus profilometry. Surface roughness decrease is at least 90%. The quasi-static and High Cycle Fatigue (HCF) mechanical characteristics of the samples are studied. The fatigue limit increases by at least 82% after laser polishing. The fatigue limit of samples with introduced pore removing pass is slightly lower than the limit for the conventionally laser polished samples. Difference in fracture mechanics of post-processed and as-built samples after HCF tests is described. © 2022 Elsevier Ltd
- ПубликацияТолько метаданныеDetermination 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
- ПубликацияТолько метаданныеComparison of Metrics for Shape Quality Evaluation of Textures Produced by Laser Structuring by Remelting (Waveshape)(2022) Panov, D.; Oreshkin, O.; Platonov, A.; Petrovskiy, V. N.; Платонов, Александр Валерьевич; Петровский, Анатолий Николаевич© 2022 by the authors. Licensee MDPI, Basel, Switzerland.The study is focused on investigating approaches for assessing the texture shape deviation obtained by laser structuring by remelting (Waveshape). A number of metrics such as Fourier spectrum harmonic ratio, cross-correlation coefficient (reverse value), and spectral entropy are investigated in terms of surface-texture shape deviation estimation. The metrics are compared with each other by testing two hypotheses: determination of target-like shape of texture (closest to harmonic shape) and determination of texture presence on the cross-section. Spectral entropy has the best statistical indicators for both hypotheses (Matthews correlation coefficient is equal to 0.70 and 0.77, respectively). The reverse cross-correlation coefficient proved to be close in terms of statistical indicators (Matthews correlation coefficient is equal to 0.58 and 0.75 for the first and second hypothesis), but is able to estimate the shape similarity of regular texture independent on its type. The provided metrics of shape assessment are not limited to the texturing process, so the presented results can be used in a broad range of scientific fields.
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