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Каталог книг и брошюр библиотеки ИФ СО РАН

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Труды сотрудников ИФ СО РАН

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bocharov G. S., Eletskii A. V., Zilova O. S., Terentyev E. V., Fedorovich S. D., Chudina O. V., Churilov G. N.
Заглавие : Mechanism of surface reinforcement of steels by nanocarbon materials using laser heating
Коллективы : Russian Science Foundation [16-19-10027]
Место публикации : Phys. Metals Metallogr. - 2018. - Vol. 119, Is. 2. - P.197-201. - ISSN 0031-918X, DOI 10.1134/S0031918X18010052. - ISSN 1555-6190(eISSN)
Примечания : Cited References:11. - This work was supported by the Russian Science Foundation, project no. 16-19-10027.
Ключевые слова (''Своб.индексиров.''): laser treatment--nanocarbon materials--technically pure iron--microhardness--microstructure--wear resistance--friction coefficient
Аннотация: The mechanism of the surface reinforcement and wear resistance of steel products are studied as a result of creating the strengthening layers with the nanocarbon using the laser heating. Laser surface treatment using soot remaining after fullerene extraction leads to a more than fivefold increase in the microhardness (up to 1086 HV) and a decrease in the friction coefficient by 20–30%. The conclusion that the reinforcement mechanism involves the formation of eutectic, cementite, martensite, the cellular substructure, and grain refinement is carried out based on metallographic studies of the strengthened layers of technically pure iron with a thickness of 20–70 μm.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bocharov G. S., Eletskii A. V., Zakharenkov A. V., Zilova O. S., Sliva A. P., Terentyev E. V., Fedorovich S. D., Churilov G. N.
Заглавие : Optimization of steel-surface hardening by carbon nanostructures followed by treatment with hIgh-intensity energy sources
Место публикации : J. Surf. Invest. - 2018. - Vol. 12, Is. 1. - P.27-32. - ISSN 10274510 (ISSN), DOI 10.1134/S102745101801007X
Примечания : Cited References: 14. - This study was supported by the Russian Science Foundation, project no. 16-19-10027.
Ключевые слова (''Своб.индексиров.''): metal surface hardening--carbon nanomaterials--laser irradiation--electron-beam treatment--microhardness
Аннотация: The effect whereby a steel surface is modified by its covering with a nanocarbon material followed by fast electron- or laser-beam irradiation is studied. The initial material is low-carbon steel. Soot produced via the thermal sputtering of graphite electrodes in an electric arc with the subsequent extraction of fullerenes is used as the nanocarbon coating. Due to the fact that nanocarbon-coated samples are irradiated with a 60-keV electron beam, the material microhardness enhances considerably. The dependence between the microhardness and the irradiation energy is nonmonotonic and reaches its maximum (about 600 ± 20 HV) under the condition that the electron-irradiation energy is 460 J/cm2 and the intensity is 1.53 kW/cm2. This corresponds to a fourfold increase in the microhardness. Electron-beam irradiation of the treated surface is accompanied by a 1.5–2-fold decrease in the friction coefficient. Experimental results are compared with data obtained under laser irradiation of the nanocarbon-coated steel surface.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gordienko A. I., Derevyagina L. S., Malikov A. G., Orishich A. M., Surikova N. S., Volochaev M. N.
Заглавие : The effect of the initial microstructure of the X70 low-carbon microalloyed steel on the heat affected zone formation and the mechanical properties of laser welded joints
Место публикации : Mater. Sci. Eng. A. - 2020. - Vol. 797. - Ст.140075. - ISSN 09215093 (ISSN), DOI 10.1016/j.msea.2020.140075
Примечания : Cited References: 32. - Microstructural studies and mechanical tests of laser welds were performed within the frame of the Fundamental Research Program of the State Academies of Sciences for 2013?2020, line of research III.23.1.1. Part of the research related to the selection of optimal laser welding parameters for low carbon steels was carried out within Basic State Project No. AAAA-A17-117030610122-6. TEM studies were carried out in Center of Federal Research Center of Kirensky Institute of Physics SB RAS. The authors are grateful to I.P. Mishin. for assistance in cross-helical rolling of the steel
Аннотация: In this paper, the heat affected zone (HAZ) of laser welded joints of the X70 steel were studied by the transmission electron microscopy method. The effect of the initial microstructure (coarse-grained hot-rolled and fine-grained after cross-helical rolling) on the HAZ formation and the mechanical characteristics of the welded joints were shown. It was found that the microstructure in the inter-critical HAZ of the steel after cross-helical rolling was more dispersed, homogeneous, and uniform compared to that of the coarse-grained hot-rolled one due to the initial fine-grained ferrite-bainitic-pearlite microstructure and the absence of pronounced ferrite-pearlite banding in the base metal. The character of the microhardness value distribution in the HAZ of the steel after cross-helical rolling was smooth with the gradual decrease from 370 down to 185 HV as shifted towards the base metal. In the HAZ of the coarse-grained hot-rolled steel, the heterogeneous microhardness value (up to 640–670 НV) distribution was revealed. The reason was the upper degenerate bainite microstructure with high residual stresses, characterized by laths up to 2.0–2.5 μm long and a high martensitic-austenitic constituent fraction (10–16%) of a slender shape along the boundaries of bainite laths. The conclusion was drawn that one of the ways to reduce the brittleness of the laser welded joints could be using the initially fine-grained steels possessing the homogeneous (mainly bainitic) microstructure.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ruseikina A. V., Chernyshev V. A., Velikanov D. A., Aleksandrovsky A. S., Shestakov N. P., Molokeev M. S., Grigoriev M. V., Andreev O. V., Garmonov A. A., Matigorov A. V., Melnikova L. V., Kislitsyn A. A., Volkova S. S.
Заглавие : Regularities of the property changes in the compounds EuLnCuS3 (Ln = La-Lu)
Место публикации : J. Alloys Compd. - 2021. - Vol. 874. - Ст.159968. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2021.159968
Примечания : Cited References: 102. - The work was supported by the Ministry of Science and Higher Education of the Russian Federation under Project No. FEUZ-2020-0054 ; by the " YMNIK " program research project No. 14977GY/2019; by the Ministry of Science and Higher Education of the Russian Federation under project RFMEFI59420X0019
Аннотация: This work contains the results of complex experimental research of the compounds EuLnCuS3 (Ln = La-Lu) enhanced by the DFT calculations. It is aimed at the data replenishment with particular attention to the revelation of regularities in the property changes, in order to extend the potential applicability of the materials of the selected chemical class. The ab initio calculations of the fundamental vibrational modes of the crystal structures were in good agreement with experimental results. The wavenumbers and types of the modes were determined, and the degree of the ion participation in the modes was also estimated. The elastic properties of the compounds were calculated. The compounds were found out to be IR-transparent in the range of 4000–400 cm–1. The estimated microhardness of the compounds is in the range of 2.68–3.60 GPa. According to the DSC data, the reversible polymorphous transitions were manifested in the compounds EuLnCuS3 (Ln = Sm, Gd-Lu): for EuSmCuS3 Tα↔β = 1437 K, ΔНα↔β = 7.0 kJ·mol-1, Tβ↔γ = 1453 K, ΔНβ↔γ = 2.6 kJ·mol-1; for EuTbCuS3 Tα↔β = 1478 K, ΔНα↔β = 1.6 kJ·mol-1, Tβ↔γ = 1516 K, ΔНβ↔γ = 0.9 kJ·mol-1, Tγ↔δ = 1548 K, ΔНγ↔δ = 1.6 kJ·mol-1; for EuTmCuS3 Tα↔β = 1543 K, Tβ↔γ = 1593 K, Tγ↔δ = 1620 K; for EuYbCuS3 Tα↔β = 1513 K, Tβ↔γ = 1564 K, Tγ↔δ = 1594 K; for EuLuCuS3 Tα↔β = 1549 K, Tβ↔γ = 1601 K, Tγ↔δ = 1628 K. In the EuLnCuS3 series, the transition into either ferro- or ferrimagnetic states occurred in the narrow temperature range from 2 to 5 K. The tetrad effect in the changes of incongruent melting temperature and microhardness conditioned on rLn3+ as well as influencing of phenomenon of crystallochemical contraction were observed. For delimiting between space groups Cmcm and Pnma in the compounds ALnCuS3, the use of the tolerance factor t’ = IR(A)·IR(C) + a×IR(B)2 was verified.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gordienko, A., I, Malikov A. G., Volochaev M. N., Panyukhina A. D.
Заглавие : Influence of chemical composition and thermomechanical treatment of low-carbon steels on the microstructure and mechanical properties of their laser welded joints
Коллективы : [FWRW-2021-0009]; [121030900259-0]
Место публикации : Mater. Sci. Eng. A. - 2022. - Vol. 839. - Ст.142845. - ISSN 0921-5093, DOI 10.1016/j.msea.2022.142845. - ISSN 1873-4936(eISSN)
Примечания : Cited References: 38. - Microstructural studies and mechanical tests of laser welds were performed according to the Government research assignment for ISPMS SB RAS, project FWRW-2021-0009. Part of the research related to the selection of optimal laser welding parameters for low carbon steels was carried out within Basic State Project No. 121030900259-0
Предметные рубрики: AUSTENITE GRAIN-SIZE
HEAT-AFFECTED ZONE
MARTENSITE START TEMPERATURE
Аннотация: The paper reports microstructures (revealed by transmission electron microscopy) in various zones of laser welds of the X70 and X80 low-carbon steels with different initial microstructures, as well as chemical and phase compositions. In the X70 steels with 0.13% C, the microstructure refinement has been achieved through helical rolling at temperatures of 920 °C and 850 °C (designated as X70-920 and X70-850, respectively). For all studied cases, both initial steel microstructures and phase compositions have determined the formation of different microstructures with various microhardness levels in the weld metal and heat-affected zones. For the X70-850 steel with a more dispersed and homogeneous microstructure (dF = 3.3 μm), a lower microhardness level of 340 HV has been observed in the weld metal, compared with the X70-920 one (dF = 5.5 μm, 370 HV). The reason has been the formation of both bainite and martensite laths in the X70-850 weld metal, while only lath and lamellar martensite has formed in the X70-920 one. For the X80 steel (0.55% C), lowering the carbon content and additional microalloying with chromium, molybdenum and nickel have enabled to decrease the microhardness level down to 295 HV in the weld metal due to the degenerate upper bainite formation and the carbon level reduction in martensite. The dispersed and homogeneous initial microstructures of the X70-850 and X80 steels has provided the formation of granular ferrite-bainite microstructures in the intercritical heat-affected zone. They have possessed a lower proportion of residual austenite regions and small sizes of twinned martensite areas. The welded X80 steel specimen has been characterized by higher ductile properties compared to both X70 ones.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkova I. R., Tyryshkina L. E., Volochaev M. N., Zaloga A. N., Shabanova K. A., Ovchinnikov A. V., Lyamkin A. I.
Заглавие : The effect of aluminum-oxide powders on the structure and properties of copper electrodeposited composite coatings
Место публикации : Prot. Met. Phys. Chem. Surf. - 2023. - Vol. 59, Is. 1. - P.71-75. - ISSN 20702051 (ISSN), DOI 10.1134/S2070205122700022. - ISSN 2070206X (eISSN)
Примечания : Cited References: 9
Аннотация: Copper electrodeposited composite coatings containing two types of aluminum-oxide powders with different dispersities (alumina Al2O3-1 and electroexplosive aluminum-oxide nanopowder Al2O3-2) are obtained during the work. The studies show that introducing the powders leads to a change in the microstructure of the composites and a change in the grain growth principles during the formation of the coatings. Refinement and ordering of the grain structure of the coatings occurs and twinning defects and texture are formed. The change in the formation of the microstructure of the composites leads to a change in some operational characteristics: an increase in the microhardness (by 10% in the composites with the addition of alumina and by more than 30% in the coatings with electroexplosive aluminum oxide) and ultimate tensile strength (by 20% in the composites with Al2O3-1 and almost 1.5-fold in the samples with Al2O3-2).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grigorchenko V.M., Molokeev M. S., Oreshonkov A. S., Aleksandrovsky A. S., Kertman A.V., Abulkhaev M.U., Mereshchenko A.S., Yurev I.O., Shulaev N.А., Kamaev D.N., Elyshev A.V., Andreev O.V.
Заглавие : Synthesis and properties of the NdSF compound, phase diagram of the NdF3–Nd2S3 system
Колич.характеристики :9 с
Место публикации : J. Solid State Chem. - 2024. - Vol. 333. - Ст.124640. - ISSN 00224596 (ISSN), DOI 10.1016/j.jssc.2024.124640. - ISSN 1095726X (eISSN)
Примечания : Cited References: 48. - This research was funded by the Tyumen Oblast Government as part of the West-Siberian Interregional Science and Education Center’s project No. 89-DON (3)The studies ab initio simulation of electron band structure, analysis of optical properties, XRD analysis was partially supported by "Priority-2030" program for the Siberian Federal University, and the state assignment of Kirensky Institute of Physics
Аннотация: The NdF3–Nd2S3 system attracts attention of researchers due to the possibility of using LnSF compounds (Ln = rare earth element) as possible new p- and n-type materials. The samples of this system were synthesized from NdF3 and Nd2S3. The NdSF compound belongs to the PbFCl structural type, P4/nmm space group, unit cell parameters: a = 3.9331(20) Å, c = 6.9081(38) Å. The experimentally determined direct and indirect NdSF bandgaps are equal to 2.68 eV and 2.24 eV. The electronic band structure was calculated via DFT simulation. The NdSF compound melts congruently at T = 1385 ± 10°С, ΔНm = 40.5 ± 10 kJ/mol, ΔS = 24.4 ± 10 J/mol. The NdSF microhardness is 455 ± 10 HV. Five phase transformations in the NdF3–Nd2S3 system were recorded by DSC; their balance equations were derived. The liquidus of the system calculated from the Redlich–Kister equation is fully consistent with the DSC data.
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