Персона:
Крымская, Ольга Александровна

Научные группы

Научная группа

Лаборатория рентгеновского текстурного анализа (Кафедра №9 ИЯФиТ)

Организационные подразделения

Организационная единица

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.

Фамилия

Крымская

Имя

Ольга Александровна

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Теперь показываю 1 - 10 из 44

Только метаданные
Properties of Nb3Sn superconductors of various designs
(2022) Tsapleva, A.; Alekseev, M.; Abdyukhanov, I.; Konovalova, N.; Krymskaya, O.; Isaenkova, M.; Крымская, Ольга Александровна; Исаенкова, Маргарита Геннадьевна
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Thermal 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.
Только метаданные
EFFECT OF SUBSTRUCTURAL INHOMOGENEITY ON THE ANISOTROPY OF PHYSICAL AND MECHANICAL PROPERTIES OF TEXTURED MATERIALS
(2022) Isaenkova, M. G.; Krymskaya, O. A.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна
Today, anisotropy of the physical and mechanical properties of textured materials is mainly calculated based on average properties of a single crystal and information about the volume percent of grains that have different orientations, which can be determined with the help of distribution function. It is a fact that, in addition to the crystallographic texture, substructural inhomogeneity develops in rolled materials, which manifests itself as a difference in the distortion of the crystalline lattice (hardening) and elastic microstrains in grains belonging to different texture components. Substructural characterization is based on the X-ray method of Generalized Direct Pole Figures, which implies that a full profile of X-ray reflections is registered for different positions of the specimen, i.e. as a direct pole figure is being built. As a result, one can obtain the FWHMs of X-ray lines and elastic microstrains distributed on the stereographic projection. It means that a textured polycrystalline material that has undergone thermo-mechanical treatment is characterized with a certain spectrum of structural states and the presence of residual elastic microstrains. Therefore, the degree of macroscopic anisotropy of the product properties is defined both by the predominant grain orientation in the polycrystal and by the parameters of substructural inhomogeneity of grains belonging to different texture components. In spite of the fact that the elastic properties of an individual crystallite do not change and the tensile and compressive elastic microdeformations are balanced in the studied volume of the material, the elasticity of the whole system, i.e. of a polycrystal, changes due to interacting grains and the elastic energy stored in them. The authors propose a method for calculating elastic moduli and thermal expansion coefficients while accounting for the substructural inhomogeneity of the material by minimizing the elastic energy of the textured material. The efficiency of this method is demonstrated on specimens of a semi-finished channel pipe made of Zr – 2.5% Nb alloy. This research was funded by the Ministry of Science and Higher Education of the Russian Federation; Agreement No. 075-15-2021-1352. © 2022, Ore and Metals Publishing house. All rights reserved.
Открытый доступ
Термическая 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 Александрович
Рассмотрены 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.
Только метаданные
CRYSTALLOGRAPHIC TEXTURE AND STRUCTURE FORMED IN ROLLED SHEETS OF ZIRCONIUM ALLOYS DURING ANNEALING
(2022) Klyukova, K. E.; Isaenkova, M. G.; Krymskaya, O. A.; Fesenko, V. A.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна; Фесенко, Владимир Александрович
This paper examines the processes of recrystallization in sheets of Zr – 2.5% Nb alloy rolled down to a 50–90% deformation and annealed at 610oC for 1, 3 and 5 hours. The heating rate varied from 10 to 100oC/min. With the help of X-ray structure and texture analysis, the authors looked at optimizing the crystal structure of the deformed alloy while examining changes in the crystallographic texture. It was established that annealing of Zr – 2.5% Nb alloy sheets performed at the temperature that corresponds to the dual phase region α + β of an equilibrium phase diagram also leads to recrystallization, as it happens when applying the annealing temperature of 580oC. However, an 11% increase in the concentration of the additional phase suppresses changes in the crystallographic texture, which may be due to the predominant precipitation of β-zirconium at grain boundaries. At the same time, the growth of recrystallized grains still follows the main regularities of orientation: the orientation of growing grains corresponds to the texture maximum slopes of the direct pole figure (0001); an increased pole density was observed on the difference charts of the direct pole figure (10.0), which is indicative of the presence of grains that are disoriented to the deformed matrix at 30o around the base normals. It is shown that the contribution of the above mentioned processes is determined by the type of initial texture, the annealing temperature, the heating rate and the amount of β-phase. An extended annealing time (from 1 to 5 hours) at the temperature of the dual phase region does not cause any significant change in the crystallographic texture.
Только метаданные
Effect of Preliminary Heat Treatment on the Formation of Structure and Mechanical Properties of Brass during Alternating Bending
(2023) Rogachev, S. O.; Shelest, A. E.; Andreev, V. A.; Isaenkova, M. G.; Krymskaya, O. A.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна
Только метаданные
REGULARITIES OF CRYSTALLOGRAPHIC TEXTURE FORMATION IN EP648 ALLOY OBTAINED BY SELECTIVE LASER POWDER MELTING
(2024) Krymskaya, O. A.; Isaenkova, M. G.; Cherepanova, I. А.; Osintsev, A. V.; Крымская, Ольга Александровна; Исаенкова, Маргарита Геннадьевна; Черепанова, Ирина Андреевна; Осинцев, Андрей Вениаминович
Только метаданные
Accounting 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%.
Только метаданные
The Chemical and Mineral Composition of Particles Precipitated from a Plasma–Dust Layer on the Porthole of the Descend Space Vehicles during The Passage of the Earth’s Atmosphere
(2021) Tugaenko, V. Y.; Ovchinnikov, D. S.; Isaenkova, M. G.; Kargin, N. I.; Krymskaya, O. A.; Timofeev, A. A.; Babich, Y. A.; Исаенкова, Маргарита Геннадьевна; Каргин, Николай Иванович; Крымская, Ольга Александровна; Тимофеев, Алексей Афанасьевич
© 2021, Pleiades Publishing, Ltd.Electron microscopic studies of the surface of the spacecraft descent vehicle (DV) have revealed faceted particles of various shape and size, which are formed when the DV travels through the Earth’s atmosphere at an ultrasonic velocity. The particles are no more than 5 µm in size. An X-ray diffraction analysis of the phase composition of the precipitate on the DVs porthole after their landing showed that the test samples contain the following minerals: сryptohalite—(NH4)2[SiF6]), sal ammoniac—NH4Cl, mullite—Al2SiO5, and other minerals that rarely occur in nature. The paper presents results of electron microscopic and X-ray studies of samples taken from 4 descent vehicles.
Только метаданные
Elaboration of a Hydrogenation Procedure for Zirconium Alloys
(2025) Mikhalchik, V. V.; Mikhalchik,V.V.; Isaenkova, M. G.; Tenishev, A. V.; Shornikov, D. P.; Bazhenov, A. A.; Petrov, M. I.; Fesenko,V. A.; Krymskaya, O. A.; Михальчик, Владимир Валерьевич; Исаенкова, Маргарита Геннадьевна; Тенишев, Андрей Вадимович; Шорников, Дмитрий Павлович; Баженов, Александр Андреевич; Петров, Марк Игоревич; Фесенко, Владимир Александрович; Крымская, Ольга Александровна; Чернякова, Валерия Сергеевна