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Morozov, E. V.
MRI monitoring and non-destructive quality measurement of polymeric patterns manufactured via stereolithography / E. V. Morozov, M. M. Novikov, V. M. Bouznik // Addit. Manuf. - 2016. - Vol. 12. - P. 16-24, DOI 10.1016/j.addma.2016.05.015 . - ISSN 2214-8604
Кл.слова (ненормированные):
Aging -- Build parameters -- MRI -- Polymers -- Stereolithography
Аннотация: The use of Magnetic Resonance Imaging (MRI) for monitoring, studying and performing output quality measurements of the acrylate-based polymeric patterns manufactured using stereolithography (SL) was introduced in this work. The effects of build parameters and humid environment on sample homogeneity, distribution of crosslink density, stability and defect formation were examined. The spatial resolution of the method was found to be sufficient to identify patterns according to the build parameters used and to detect specific hatch-predicted crosslink density variations. Qualitative information obtained using MRI visualisation was supplemented by quantitative measurements of Nuclear Magnetic Resonance (NMR) relaxation times and 1H NMR spectra. NMR spectroscopy confirmed the identity of the chemical composition among the patterns and showed that the crosslink density variation observed via spatially resolved T2-profiles stems from the difference of the build parameters. Different types of defects in the samples were observed and classified; some defects originated from local matrix continuity failures (partially cured resin trapping within the polymer or bubbles formation), while other defects were found in the form of bulk layering. MRI visualisation coupled with relaxometry and 1H spectroscopy of patterns during their interaction with humidity allowed tracking water distribution inside the sample and observing effects of swelling, fracturing and chemical decomposition. It was found that the initial inhomogeneous structure of the specimen has a crucial role in subsequent fracturing due to non-uniform expansion of the swollen parts. As a result, the approach presented in this work improves the output quality control and current testing techniques, provides insight how physical properties of the 3D parts are affected by different technical parameters, and eventually can help the use of SL technologies for a variety of applications. © 2016 Elsevier B.V.

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Держатели документа:
Kirensky Institute of Physics SB RAS, Krasnoyarsk, Russian Federation
Institute of Chemistry and Chemical Technology SB RAS, Krasnoyarsk, Russian Federation
Institute on Laser and Information Technologies RAS, Shatura, Russian Federation
All-Russian Scientific Research Institute of Aviation Materials, Moscow, Russian Federation

Доп.точки доступа:
Novikov, M. M.; Bouznik, V. M.; Морозов, Евгений Владимирович
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The effect of high-temperature and high-stress martensite aging on martensitic transformation and microstructure of Ti-51.5 at % Ni single crystals / E. E. Timofeeva, E. Yu. Panchenko, A. S. Eftifeeva [et al.] // AIP Conf. Proc. - 2020. - Vol. 2310. - Ст. 020336DOI 10.1063/5.0034595. - Cited References: 9. - The study was supported by the Russian Science Foundation (grant No. 18-19-00298)
Аннотация: In this work, the thermomechanical stability of heterophase [001]-oriented Ti–51.5 at % Ni single crystals was investigated. Experiments include a high-temperature and high-stress martensite ageing and also loading/unloading cycling at superelasticity (SE) during forward and reverse B2-B19′ martensitic transformations (MT). It was found that Ti–51.5 at % Ni single crystals containing large Ti3Ni4 particles (d ∼ 600 nm after ageing at 850 K for 1 h) is not resistant to stress-assisted martensite ageing and cycling. Stress-assisted martensite ageing at 423 K, 1.7–2 GPa, for 2–4 h leads to the deformation of large Ti3Ni4 particles, the appearance of dislocations at the particle-matrix boundaries, an increase in MT temperatures (by 10 K), and a strong diffusion of the MT (the intervals of forward and reverse MT Δσ1 and Δσ2 increase in 2 times). During loading/unloading cycling at 423 K and 1.0–2.0 GPa single crystals with large particles were destroyed after 20–25 cycles. It is possible to increase the thermomechanical stability due to the additional precipitation of nanosized Ti3Ni4 particles (d‹30 nm by ageing at 673 K, 1 h), which appear in the B2 matrix between large particles. In such crystals with a bimodal structure no changes in the microstructure and functional properties were observed after stress-assisted martensite ageing and loading/unloading cycling.

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Держатели документа:
Siberian Physical-Technical Institute, National Research Tomsk State University, Tomsk, 634050, Russian Federation
Kirensky Institute of Physics, Federal Research Center, KSC Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Timofeeva, E. E.; Panchenko, E. Yu.; Eftifeeva, A. S.; Yanushonite, E. I.; Zherdeva, M. V.; Chumlyakov, Yu. I.; Volochaev, M. N.; Волочаев, Михаил Николаевич; International Conference on Physical Mesomechanics. Materials with Multilevel Hierarchical Structure and Intelligent Manufacturing Technology 2020(5 - 9 October 2020 ; Tomsk, Russian Federation)
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The cyclic stability of superelasticity in aged Ti49.3Ni50.7 single crystals with oxide surface / A. S. Eftifeeva, E. Y. Panchenko, I. D. Fatkullin [et al.] // Metals. - 2022. - Vol. 12, Is. 12. - Ст. 2113, DOI 10.3390/met12122113. - Cited References: 30. - This research was funded by grant under the Decree of the Government of the Russian Federation No. 220 of 9 April 2010 (Agreement No. 075-15-2021-612 of 4 June 2021) . - ISSN 2075-4701
Кл.слова (ненормированные):
martensitic transformation -- single crystals -- aging -- precipitation -- oxide layer -- functional properties
Аннотация: The cyclic stability of superelasticity in compression in [001]B2-oriented Ti49.3Ni50.7 single crystals is considered in this paper. The crystals were aged at 823 K for 1.0 h in air and helium. It has been experimentally shown that a two-layered surface thin film, consisting of a Ni-free oxide layer and a Ni-rich sublayer, appears after the oxidation at 823 K in air. The surface layers have a weak effect on the forward B2-R-B19’ martensitic transformation temperatures: TR temperature increases by 4 K; Ms and Mf temperatures decrease by 6 K. The oxide layer does not affect either the superelasticity response during fatigue tests or the temperatures of reverse B19’-B2 martensitic transformation. The cracking of the surface oxide layer during fatigue tests was not found in [001]B2-oriented single crystals aged in air. This is contributed by the relaxation of internal stresses. Such internal stresses are caused by both the formation of an oxide layer during aging and the matrix deformation at the stress-induced martensitic transformation. The main relaxation mechanisms of the internal stresses are the oriented growth of Ti3Ni4 precipitation near a thin surface film at aging in air, the formation of dislocations near the precipitation-matrix interface and a fine twinned B19’-martensite at fatigue tests.

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Держатели документа:
Laboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenina Str. 36, 634050 Tomsk, Russia
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50/38, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Eftifeeva, Anna S.; Panchenko, Elena Y.; Fatkullin, Ilya D.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Tagiltsev, Anton I.; Chumlyakov, Yuriy I.
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Surface hardening of high-nitrogen austenitic steel by severe deformation–heat treatment / N. A. Narkevich, M. N. Volochaev, I. A. Shulepov, Yu. F. Gomorova // Phys. Metals Metallogr. - 2022. - Vol. 123, Is. 10. - P. 1024-1030, DOI 10.1134/S0031918X22601007. - Cited References: 28. - This work was performed within the state assignment of the Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences (theme no. FWRW-2021-0009) . - ISSN 0031-918X. - ISSN 1555-6190
Кл.слова (ненормированные):
high-nitrogen steel -- austenite -- ultrasonic forging -- electron beam treatment -- aging -- CrN -- strength -- plasticity
Аннотация: The structure and mechanical properties of austenitic high-nitrogen steel (16.5 Cr, 18.8 Mn, 0.07 C, 0.53 N, 0.52 wt % Si, Fe for balance) have been investigated after severe deformation–heat treatment, which has involved shock surface forging at the ultrasonic frequency (USF) and electron-beam heat treatment (EBT). A subgrain structure hardened by CrN nanoparticles has been shown to form in the surface layer as a result of deformation–heat treatment. No discontinuous decomposition of austenite with the formation of Cr2N nitrides takes place. This structure modification in the surface layer enhances the strength properties of the steel, namely, σ0.2 increases to 712 MPa and σu to 923 MPa at a plasticity of 25%. The yield strength increases by 50% compared to the state after quenching.

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Публикация на русском языке Упрочнение поверхности высокоазотистой аустенитной стали интенсивной деформационно-термической обработкой [Текст] / Н. А. Наркевич, М. Н. Волочаев, И. А. Шулепов, Ю. Ф. Гоморова // Физ. металлов и металловед. - 2022. - Т. 123 № 10. - С. 1092-1098

Держатели документа:
Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, 634055, Tomsk, Russia
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Narkevich, N. A.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Shulepov, I. A.; Gomorova, Yu. F.
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The effect of heat treatment on microstructure and martensitic transformation temperatures in Ni44Fe19Ga27Co10 single crystals / E. E. Timofeeva, E. Yu. Panchenko, A. B. Tokhmetova [et al.] // Phys. Scr. - 2024. - Vol. 99, Is. 1. - Ст. 015958, DOI 10.1088/1402-4896/ad16b2. - Cited References: 34. - This work was supported by the Russian Science Foundation (grant No. 21-19-00287) . - ISSN 0031-8949. - ISSN 1402-4896
Кл.слова (ненормированные):
martensitic transformations -- single crystals -- aging -- second phase particles -- microstructure
Аннотация: The microstructure and temperature of martensitic transformation of Ni44Fe19Ga27Co10 single crystals after aging at temperatures from 623 K to 1173 K were studied by electron microscopy and differential scanning calorimetry. The temperature ranges of the second phase precipitation, their lattice structure and volume fraction, and also the modification of the nanodomain structure of the L21+B2 high-temperature phase were determined in dependence on aging temperature. The influence of microstructure parameters on the martensitic transformation temperatures, transformation intervals and thermal hysteresis has been discussed.

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Держатели документа:
Tomsk State University, Novosobornaya square 1, Tomsk, 634050, Russia
Kirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Timofeeva, E. E.; Panchenko, E. Yu.; Tokhmetova, A. B.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Zherdeva, M. V.; Tagiltsev, A. I.; Surikov, N. Yu.; Chumlyakov, Yu. I.
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