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Your search keyword '"Gryaznov, A. Yu."' showing total 307 results
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307 results on '"Gryaznov, A. Yu."'

1. Superplasticity-like behavior of ultrafine-grained austenitic steel 321

Author

Kopylov, V. I., Gryaznov, M. Yu., Shotin, S. V., Nokhrin, A. V., Likhnitskii, C. V., Chegurov, M. K., Chuvil'deev, V. N., and Tabachkova, N. Yu.

Subjects
Condensed Matter - Materials Science
Abstract

Hot rolled commercial metastable austenitic steel 321 with strongly elongated thin delta-ferrite particles in its microstructure was the object of investigations. Ultrafine-grained (UFG) microstructure in steel 321 was formed by Equal Channel Angular Pressing (ECAP) at 150 oC and 450 oC. When heating the UFG steel specimens, the nucleation of sigma-phase particles blocking the grain boundary migration was observed. The maximum elongation to failure (~250%) was achieved at the deformation temperature 750 oC. The process of superplastic deformation of the UFG steel 321 is controlled by simultaneous grain boundary sliding and power-law creep. The contribution of each process depends on the grain growth rate in the superplasticity regime as well as on defect accumulation on the grain boundaries. The fracture of the UFG steel 321 specimens has a cavitational character - an intensive formation of large elongated pores at the non-metallic particles as well as of the submicron pores at the sigma-phase particles in the course of superplastic deformation were observed., Comment: 41 pages, 2 tables, 15 figures, 78 references. arXiv admin note: text overlap with arXiv:2203.12102

Published
2023

4. Effect of ECAP and heat treatment on mechanical properties, stress relaxation behavior and corrosion resistance of a 321-type austenitic steel with increased delta-ferrite content

Author

Chuvil'deev, V. N., Nokhrin, A. V., Kozlova, N. A., Chegurov, M. K., Kopylov, V. I., Gryaznov, M. Yu., Shotin, S. V., Melekhin, N. V., Likhnitskii, C. V., and Tabachkova, N. Yu.

Subjects
Condensed Matter - Materials Science
Abstract

Hot rolled commercial metastable austenitic steel 0.8C-18Cr-10Ni-0.1Ti (Russian industrial name 08X18H10T, analog 321L) with strongly elongated thin delta-ferrite particles in its microstructure was the object of investigations. The lengths of these delta-particles were up to 500 mkm, the thickness was 10 mkm. The formation of the strain-induced martensite as well as the grinding of the austenite and of the delta-ferrite grains take place during ECAP. During the annealing of the UFG steel, the formation of the delta-phase particles takes place. These particles affect the grain boundary migration and the strength of the steel. However, a reduction of the Hall-Petch coefficient as compared to the coarse-grained (CG) steel due to the fragmentation of the delta-ferrite particles was observed. The samples of the UFG steel were found to have 2-3 times higher stress relaxation resistance as compared to the CG steel (a higher macroelasticity stress and a lower stress relaxation magnitude). The differences in the stress relaxation resistance of the UFG and CG steels were investigated. ECAP was shown to result in an increase in the corrosion rate and in an increased tendency to the intergranular corrosion (IGC). The reduction of the corrosion resistance of the UFG steel was found to originate from the increase in the fraction of the strain-induced martensite during ECAP., Comment: 56 pages, 3 tables, 19 figures

Published
2022
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8. Surface Properties of Powder Particles of 316L Steel and Inconel 718 Alloy and Interaction with Hydrogen of Specimens Fabricated from These Powders by Selective Laser Melting

Author

Maksimkin, I. P., Tsarev, M. V., Yukhimchuk, A. A., Boitsov, I. E., Malkov, I. L., Mokrushin, V. V., Tsareva, I. A., Zabrodina, O. Yu., Kanunov, A. E., Kashafdinov, I. F., Musyaev, R. K., Buchirin, A. V., Baluev, V. V., Vertei, A. V., Shevnin, E. V., Shotin, S. V., Chuvil’deev, V. N., and Gryaznov, M. Yu.

Published
2022
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17. Hollow-Core Microstructured Optical Fiber Based Refractometer: Numerical Simulation and Experimental Studies

Author

N. Ayyanar, G. Thavasi Raja, Skibina Y. S., Yashar E. Monfared, Zanishevskaya A. A., Shuvalov A. A., and Gryaznov A. Yu

Subjects
Photons, Refractometry, Biomedical Engineering, Pharmaceutical Science, Medicine (miscellaneous), Bioengineering, Biosensing Techniques, Equipment Design, Electrical and Electronic Engineering, Optical Fibers, Computer Science Applications, Biotechnology
Abstract

In this paper, we numerically and experimentally propose a novel hollow-core microstructured optical fiber (HC-MOF) biosensor for refractive index determination. The sensing mechanism of the proposed sensor is based on photonic bandgap effect and the location of transmission maxima of the fiber, which is strongly depend on the liquid analyte RI filled in the fiber core. The proposed HC-MOF biosensor demonstrates the spectral sensitivity of 5636.3 nm/RIU with a RI detection range of 1.333 to 1.3385 for different ratios of plasma in blood serum in our experimental studies. The HC-MOF proposed here can detect similar liquid analytes with RI close to 1.33. The proposed sensor with a high sensitivity, ease of operation and the possibility of real-time sensing has a strong potential for detection of liquid analytes and biomolecules with possible applications in medicine, chemistry, and biology.

Published
2022

19. Direct Detection of Antibodies to Yersinia pestis Using Glass Microstructural Waveguides as an Express Method for Assessing Seroconversion in Individuals Vaccinated against Plague

Author

Kudryavtseva, O. M., primary, Skibina, Yu. S., additional, Kozhevnikov, V. A., additional, Bugorkova, S. A., additional, Chainikov, M. V., additional, Gryaznov, А. Yu., additional, Glukhov, D. E., additional, Konnova, S. S., additional, Shuvalov, A. A., additional, and Shchukovskaya, T. N., additional

Published
2023
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20. Effect of σ-Phase on the Strength, Stress Relaxation Behavior, and Corrosion Resistance of an Ultrafine-Grained Austenitic Steel AISI 321

Author

Kopylov, Vladimir I., primary, Nokhrin, Aleksey V., additional, Kozlova, Natalia A., additional, Chegurov, Mikhail K., additional, Gryaznov, Mikhail Yu., additional, Shotin, Sergey V., additional, Melekhin, Nikolay V., additional, Tabachkova, Nataliya Yu., additional, Smetanina, Ksenia E., additional, and Chuvil’deev, Vladimir N., additional

Published
2022
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24. Assessment of models of diagnostic reference levels for children on radiography.

Author

Shatskiy, I. G., Gryaznov, A. Yu., and Potrakhov, Yu. N.

Subjects
*RADIOGRAPHY, *THORACIC vertebrae, *CERVICAL vertebrae, *AGE groups, *PELVIS, *LUMBAR vertebrae
Abstract

The aim of the work was to compare DRL models for children and to assess the possibility of their application in Russia. The study used the DRL models proposed by the ICRP and the European Commission and data of own study of children's exposure levels at 33 X-ray machines in 29 specialized children's medical organizations. Based on the analysis of existing models and taking into account the peculiarities of Russian medical practice, it was proposed to use a model based on the effective dose with the grouping of children by age into five groups: 0, 1, 5, 10 and 15 years old to establish the Russian DRL for children. The standard dose for a single device was determined either as the median dose values for 10 patients for each age group, or as the typical study parameters for each age group. The study included 7 most frequently performed X-ray examinations: skull (PA, Lat), cervical spine (AP, Lat), thoracic spine (AP, Lat), lumbar spine (AP, Lat), chest (AP/PA, Lat), abdomen (AP), pelvis (AP). In this case, the DRL is defined as the 75th percentile of the distribution of the number of X-ray machines according to the standard effective dose. [ABSTRACT FROM AUTHOR]

Published
2023
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25. Software complex for simulation of secondary X-ray radiation spectra.

Author

Kholopova, E. D., Gryaznov, A. Yu., Staroverov, N. E., Alexandrova, A. A., Chebykin, A. P., and Bavkunova, I. Yu.

Subjects
*X-ray spectra, *ELECTROMAGNETIC spectrum, *X-ray spectroscopy, *SIMULATION software, *X-ray fluorescence
Abstract

The article is devoted to the description of the software, in which the possibility of correct calculation of the spectrum excited in the sample under study during X-ray fluorescence analysis was realized. It allows you to simulate the spectrum of primary radiation of an X-ray tube, the spectrum of X-ray fluorescence from multicomponent samples, the conditions for registering secondary radiation. [ABSTRACT FROM AUTHOR]

Published
2023
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26. Improving the analytical performance of an X-ray fluorescence gold separator.

Author

Kholopova, E. D., Gryaznov, A. Yu., Staroverov, N. E., Alexandrova, A. A., Baranov, I. M., and Guk, K. K.

Subjects
*X-ray fluorescence, *GOLD, *X-ray detection, *SENSITIVITY analysis
Abstract

The article discusses the factors that make it possible to increase the sensitivity and accuracy of the analysis by optimizing the parameters of the detection unit for an X-ray fluorescence gold separator, and also presents the results of the studies. [ABSTRACT FROM AUTHOR]

Published
2023
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27. The trends of the development of computed tomography in the Russian Federation in 2015-2020 including the COVID-19 pandemic.

Author

Druzhinina, P. S., Romanovich, I. K., Chipiga, L. A., Vodovatov, A. V., Gryaznov, A. Yu., Bessonov, V. B., and Alexandrova, A. A.

Subjects
COVID-19 pandemic, COMPUTED tomography, HEALTH facilities, RADIATION protection, MASS surveillance, NO-tillage
Abstract

Computed tomography rapidly develops both in foreign countries and in the Russian Federation and is associated with significant individual patient doses. The aim of this study was to analyze the structure of the equipment and assess the dynamics of changes in the collective dose and the number of CT examinations over the last 5 years (2015-2020) in the Russian Federation, in particular in 2020 during the COVID-19 pandemic. The study was based on the analysis of data from the state statistical surveillance forms №3-DOZ of the ESKID system f and form №30 "Information about medical facility". The increase in the number of CT examinations and the collective dose from CT in 2020 is comparable with the total increase of these indicators over the previous five years (2015-2019). An increase in the collective dose of population of the Russia Federation from CT examinations by 70% in 2020 requires a special attention to ensuring the radiation protection of patients during CT, by using principles of justification and optimization, implementation of diagnostic reference levels. [ABSTRACT FROM AUTHOR]

Published
2023
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28. Effect of Hydrogen on the Structure and Mechanical Properties of 316L Steel and Inconel 718 Alloy Processed by Selective Laser Melting

Author

Maksimkin, Igor P., primary, Yukhimchuk, Arkadiy A., additional, Malkov, Igor L., additional, Boitsov, Igor E., additional, Musyaev, Rafael K., additional, Buchirin, Aleksey V., additional, Baluev, Victor V., additional, Vertei, Anton V., additional, Shevnin, Evgeniy V., additional, Shotin, Sergey V., additional, Chuvil’deev, Vladimir N., additional, and Gryaznov, Mikhail Yu., additional

Published
2022
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30. Improving the physical and mechanical characteristics of unalloyed titanium VT1-0 and studying the effect of selective laser melting parameters

Author

null Murashov A. A., null Semenycheva A. V., null Sakharov N. V., null Piskunov A. V., null Melekhin N. V., null Sysoev A. N., null Chuvildeev V. N., null Shotin S. V., and null Gryaznov M. Yu.

Abstract

Comprehensive studies of the physical and mechanical properties and structure of VT1-0 titanium samples processed by selective laser melting have been carried out. High strength characteristics (the ultimate tensile strength of 820 MPa, the yield strength of 710 MPa) have been achieved. These exceed by 2 times the values for this material produced using conventional technology. The formation of the martensitic α'-phase, obtained due to the high crystallization rates realized in selective laser melting process, is the reason for the increase in the mechanical characteristics of titanium VT1-0. Mechanical characteristics of titanium VT1-0 subjected to high-temperature annealing demonstrated a monotonous decrease in strength parameters by 15% and an increase in plastic characteristics by 30%. It is shown that the technology of selective laser melting makes it possible to solve the problem of improving the strength characteristics of unalloyed titanium to create a new class of medical devices. Keywords: unalloyed titanium, VT1-0, additive technology, selective laser melting, density, strength, plasticity, elastic modulus, microstructure, implants for surgery.

Published
2023

33. Effect of σ-Phase on the Strength, Stress Relaxation Behavior, and Corrosion Resistance of an Ultrafine-Grained Austenitic Steel AISI 321.

Author

Kopylov, Vladimir I., Nokhrin, Aleksey V., Kozlova, Natalia A., Chegurov, Mikhail K., Gryaznov, Mikhail Yu., Shotin, Sergey V., Melekhin, Nikolay V., Tabachkova, Nataliya Yu., Smetanina, Ksenia E., and Chuvil'deev, Vladimir N.

Subjects
AUSTENITIC steel, CORROSION resistance, CRYSTAL grain boundaries, STRESS relaxation (Mechanics), STEEL corrosion, STEEL
Abstract

This paper reported the results of research into the effect of Equal Channel Angular Pressing (ECAP) temperature and 1-h annealing temperature on mechanical properties, stress-relaxation resistance, and corrosion resistance of austenitic steel AISI 321L with strongly elongated thin δ-ferrite particles in its microstructure. The formation of α′-martensite and fragmentation of austenite grains takes place during ECAP. Ultrafine-grained (UFG) steels demonstrate increased strength. However, we observed a reduced Hall–Petch coefficient as compared with coarse-grained (CG) steels due to the fragmentation of δ-ferrite particles. UFG steel specimens were found to have 2–3 times higher stress-relaxation resistance as compared with CG steels. For the first time, the high stress-relaxation resistance of UFG steels was shown to stem from a internal stress-relaxation mechanism, i.e., the interaction of lattice dislocations with non-equilibrium grain boundaries. Short-time 1-h annealing of UFG steel specimens at 600–800 °C was found to result in the nucleation of σ-phase nanoparticles. These nanoparticles affect the grain boundary migration, raise strength, and stress-relaxation resistance of steel but reduce the corrosion resistance of UFG steel. Lower corrosion resistance of UFG steel was shown to be related to the formation of α′-martensite during ECAP and the nucleation of σ-phase particles during annealing. [ABSTRACT FROM AUTHOR]

Published
2023
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