Персона: Крымская, Ольга Александровна
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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- ПубликацияОткрытый доступТермическая стойкость сталей с повышенными характеристиками прочности для корпусов перспективных реакторов ВВЭР различных проекто(2023) Мальцев, Д. А.; Крымская, Ольга Александровна; Исаенкова, Маргарита Геннадьевна; Кулешова, Евгения Анатольевна; Федотов, Иван Владимирович; Минушкин, Роман АлександровичРассмотрены результаты структурных исследований и механических испытаний после длительного теплового воздействия лабораторных плавок металлургически усовершенствованной стали 15Х2НМФА и стали с повышенным содержанием никеля, рассматриваемых в качестве материалов корпусов перспективных реакторов ВВЭР различных проектов. Показано, что как для усовершенствованной стали 15Х2НМФА, так и для высоконикелевой стали отсутствуют признаки зернограничного охрупчивания после проведения термообработки, провоцирующей охрупчивание, что связано с очень низкой зернограничной сегрегацией фосфора в исходном состоянии, обусловленной повышенной дисперсностью структуры, а также достаточно низким содержанием примесей. Кроме того, для усовершенствованной стали 15Х2НМФА не выявлено изменения предела текучести, что согласуется с результатами структурных исследований. Для высоконикелевой стали в результате длительного теплового воздействия выявлена тенденция к небольшому снижению предела текучести на 5 – 10% и закономерному снижению критической температуры хрупкости. Снижение механических характеристик связано с относительно низкой температурой высокого отпуска высоконикелевой стали и, соответственно, возможным протеканием процессов доотпуска структуры при длительном тепловом воздействии, о чем свидетельствуют результаты рентгеноструктурных исследований. Несмотря на протекание процессов доотпуска в высоконикелевой стали при длительном тепловом воздействии сохраняется стабильность основных упрочняющих карбидных фаз, за счет чего предел текучести остается на достаточно высоком уровне, превышающем значения для используемых сталей корпусов реакторов ВВЭР даже при тепловом воздействии с параметрами, значительно превосходящими предполагаемые условия эксплуатации корпусов перспективных ВВЭР. При этом снижение критической температуры хрупкости при тепловом воздействии лишь способствует повышению стойкости стали против хрупкого разрушения при эксплуатации.
- ПубликацияОткрытый доступThermal resistance of steels with increased strength properties for pressure vessels of advanced VVER reactors of various designs(2023) Maltsev, D. A.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна; Федотов, Иван Владимирович; Кулешова, Евгения Анатольевна; Минушкин, Роман Александрович; Kuleshova, E. A.; Fedotov, I. V.; Isaenkova, M. G.; Krymskaya, O. A.; Minushkin, R. A.The paper considers the results of structural studies and mechanical tests after a long-term thermal exposure of laboratory heats of the metallurgically improved 15Kh2NMFA steel and steel with an increased content of nickel considered as materials for the pressure vessels of advanced VVER-type reactors of various designs. It has been shown that, both for the improved 15Kh2NMFA steel and the high-nickel steel, there are no signs of grain boundary embrittlement after an segregation provoking embrittlement heat treatment. This is explained by the extremely low grain boundary segregation of phosphorus in the initial state caused by a high degree of the structure dispersity as well as by rather a low content of impurities. Besides, no changes have been found in the yield strength value for the improved 15Kh2NMFA steel, which agrees with the structure investigation results. For the high-nickel steel, a tendency towards a minor yield strength decrease by 5 to 10% and a regular reduction of the critical brittleness temperature has been revealed. A decrease in the mechanical properties has been caused by a relatively low temperature of tempering for the high-nickel steel and, accordingly, by the potential occurrence of the structure recovery during long-term thermal exposure, as evidenced by the results of an X-ray diffraction analysis. Despite the structure recovery in the high-nickel steel under the long-term thermal exposure, the main strengthening carbide phases remain stable. Due to this, the yield strength value remains at a relatively high level that exceeds the values for the modern VVER-type vessel steels, even in the case of a thermal exposure much in excess of the expected operating conditions for advanced VVER reactors. The observed decrease of critical brittleness temperature during the long-term thermal exposure contributes to an increase in the steel resistance to brittle fracture.
- ПубликацияОткрытый доступВлияние субструктурной неоднородности текстурованных сплавов на основе циркония на анизотропию их физико-механических свойств(НИЯУ МИФИ, 2020) Крымская, О. А.; Крымская, Ольга Александровна; Перлович, Ю. А.
- ПубликацияТолько метаданныеSimulation of the Stamping of Spacing Grid Cells Made of Thin-Walled Zirconium Tubes(2019) Ivanov, A. V.; Isaenkova, M. G.; Perlovich, Y. A.; Krymskaya, O. A.; Zhuk, D. I.; Stolbov, S. D.; Klyukova, K. E.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга АлександровнаFinite element simulation is used to study the influence of the anisotropy of the properties of thin-walled tubes made of a Zr-1 wt % Nb alloy on the geometric sizes, the residual stresses, and other parameters of spacing grid cells. The anisotropy of the mechanical properties and the initial structural state are shown to substantially affect the cell sizes. The distributions of the axial and tangential residual stresses in a stamped cell are calculated and measured, and their maximum values agree well with each other.
- ПубликацияТолько метаданныеConditions for development of regular structure by deformation of metal materials(2019) Perlovich, Y. A.; Isaenkova, M. G.; Krymskaya, O. A.; Dobrokhotov, P. L.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна© 2019 Author(s).Possibilities of the new X-ray method of Generalized Pole Figures (GPF) are considered. Its applications to different textured metal materials resulted in discovery of unknown important regularities, controlling structure and texture development under their deformation treatment. Diagrams of correlation (CD) between texture pole figures and distributions of strain hardening have the specific structure, typical for most deformed metal materials. Deviations from this structure due to some features of grain deformation behavior are analyzed.
- ПубликацияТолько метаданныеEffect of Synthesis Conditions on the Structure and Phase Composition of Magnesium Diboride(2019) Abdyukhanov, I. M.; Tsapleva, A. S.; Borisov, A. V.; Figurovskii, D. K.; Krymskaya, O. A.; Isaenkova, M. G.; Крымская, Ольга Александровна; Исаенкова, Маргарита Геннадьевна© 2019, Pleiades Publishing, Ltd. Abstract—The effect of synthesis conditions exerted on the phase composition of MgB 2 samples synthesized in a temperature range from 650 to 900°C and the features of the microstructure thereof are studied. It is shown that the maximum processing level of the initial boron and magnesium mixture into magnesium boride MgB 2 with a minimum content of impurity phases of magnesium oxide and higher magnesium borides can be achieved in the samples after annealing in a temperature range from 650 to 750°C for 1 h upon a preliminary compaction pressure amounting to 630–640 MPa.
- ПубликацияОткрытый доступEffect of Alternating Bending on Structure, Texture, and Mechanical Properties of Cu–Zn Alloy(2023) Rogachev, S. O.; Shelest, A. E.; Perkas, M. M.; Andreev, V. A.; Tabachkova, N. Yu.; Yusupov, V. S.; Ten, D. V.; Isaenkova, M. G.; Krymskaya, O. A.; Крымская, Ольга Александровна; Исаенкова, Маргарита ГеннадьевнаThe structure, texture, and mechanical properties of a C27400 brass (63% Cu–37% Zn) after alternating elastic–plastic deformation were studied. A 3-mm thick brass strip after softening annealing was subjected to alternating bending through one pass (19 bending acts) using an ARKU 25/21 precision roller straightener. Electron microscopy, x-ray texture analysis, microhardness measurements, and tensile testing were used to characterize the material. It has been established that the alternating bending leads to an increase in the yield point of a thick strip by 62% and the ultimate tensile strength by 12%, while the relative elongation is slightly reduced from 57 to 52%. Such a set of properties is provided by the grain structure refinement through the twinning mechanism; after alternating bending, the average grain size decreases more than 2 times. The contribution of different layers of the strip to the overall hardening is estimated. The anisotropy of the mechanical properties and its relation to texture was studied.
- ПубликацияОткрытый доступRecrystallization of cladding tubes from Zr-based alloys for nuclear reactors(2019) Isaenkova, M. G.; Perlovich, Yu. A.; Fesenko, V. A.; Krymskaya, O. A.; Исаенкова, Маргарита Геннадьевна; Фесенко, Владимир Александрович; Крымская, Ольга Александровна© 2019 Published under licence by IOP Publishing Ltd.This paper is devoted to the regularities of change in the crystallographic texture and the structure of cladding tubes with a total degree of deformation by their cross-section of 70-80% as a result of polygonization or recrystallization during heat treatment in the temperature range from 480 to 600 °C. It is shown, that there are two competing processes of crystal lattice perfection in cladding tubes at annealing temperatures over 540 °C. The oriented growth of grain nuclei, formed at the boundaries of grains and disoriented with respect to the deformed matrix by an angle of 20-30° about basal axes, is predominant. At the recrystallization of cladding tubes from E110 alloy, a significant change in their crystallographic texture of cold rolling is observed, i.e. an increase of the integral texture parameter fr increases, and a decrease of fT. The grains, formed at the stage of plastic deformation by twinning, prove to be unstable even at the stage of polygonization, due to the mobility of highly disoriented boundaries under conditions of the anisotropic thermal expansion of neighboring regions.
- ПубликацияТолько метаданныеAccounting for twinning when modelling plastic deformation of-zirconium(2020) Isaenkova, M. G.; Perlovich, Y. A.; Krymskaya, O. A.; Zhuk, D. I.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна© 2020, "Ore and Metals" Publishing house. All rights reserved.In this work, the process of deformation of zirconium, which is widely used in nuclear power plants, was investigated using crystal plasticity modeling. This approach allows analyzing of the reorientation of grains and studying the process of material structure changing: Splitting of grains due to the development of twinning and the formation of high-angle boundaries. DAMASK code was used for the numerical solution of problems. It is based on a mathematical method for solving systems of partial differential equations using fast Fourier transformation. The program has been developed for processing simulation data and reorientation of crystallite twins in which stresses exceed a certain critical level corresponding to this material. For verification of the created method, the data of rolling zirconium single crystal plates was used. These plates were cut using the spark method from a cylindrical single crystal of pure Zr obtained by solid-phase recrystallization. The qualitative correspondence of the modeled pole figures to the experimental ones was found. The efficiency of the created model of plastic deformation in the case of simultaneous activation of slip and twinning systems is demonstrated. The dependences of the distribution of contributions to the deformation of various slip and twinning systems on the degree of deformation during rolling are constructed. According to the simulation data, the share of twinning in texture reorientation is 87%. Moreover, 66% is the share of twinning systems of the type. At further stages, the influence of twins on the texture is rather small, in total for all systems ~ 5%.
- ПубликацияТолько метаданныеEffect of the Crystallographic Texture in the α Phase on the Anisotropy of the Properties of Pseudo-α and (α + β) Titanium Alloy Sheets(2021) Medvedev, P. N.; Isaenkova, M. G.; Krymskaya, O. A.; Babich, Y. A.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна© 2021, Pleiades Publishing, Ltd.Abstract: The range in which the α-phase texture in hot-rolled sheets made of VT18U, VT41, and VT25U titanium alloys changes is found. Yield strength contours are calculated using the integral α-phase texture parameters. The yield strength anisotropy is shown to decrease with increasing β-phase content to 25 vol %, but it continues to depend on the texture of the α phase.