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Changes in microstructure, hardness and magnetic properties during annealing of 12CR18NI9TI steel irradiated in WWR-K reactor to damage doze of 5 dpa at low (80°С) temperature

Authors: Максимкин Олег Прокофьевич, Цай Кира Викторовна

Keywords: сталь, облучение, петли Франка

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12Cr18Ni9Ti austenitic stainless steel (a material of the automatic control rod for WWR-K reactor active zone) irradiated to 5 dpa at 80°C and annealed at 450–950°C for 1 hr has been studied using TEM, magnetic properties and microhardness measurements. Evolution in fine structure of the irradiated steel resulting from heat treatment was identified (Frank loops and black dots) and it was compared to changes in magnetic properties. It was assumed that magnetism of austenitic steel is associated with Frank loops of certain size (15–20 nm) in which at a relatively low temperatures (≤300°С) and irradiation dozes (<20 dpa) the formation of ferromagnetic α-phase during ε→α-transformation may occur.

On localized plastic deformation in irradiated 12Cr18Ni10Ti austenitic stainless steel

Authors: Максимкин Олег Прокофьевич, Такиева Айжан Мусагалиевна

Keywords: сталь, облучение, деформация, мартенсит

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Localized plastic flow in non-irradiated and irradiated with neutrons 12Cr18Ni10Ti stainless steel was investigated using mechanical testing and deformation microcalorimetric method. Mechanisms of necking evolution attributed to γ→α martensitic transformation were identified.

Changes in phase composition and strength properties of 12Cr18Ni10Ti austenitic steel as a result of deformation and post-deformation annealing

Authors: Цай Кира Викторовна, Рофман О.В., Отставнов М.А., Цай Кира Викторовна, Отставнов М.А., Рофман О.В.

Keywords: облучение, нержавеющая сталь, 12Х18Н10Т

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The results of experiments studying the peculiarities of changes in both phase composition and mechanical properties of austenitic 12X18H10T stainless steel, unirradiated and irradiated with neutrons, subjected to low-temperature deformation and post-deformation annealings in the temperature range 300–800 °C are discussed. The features of the formation and growth of the martensitic-phase during deformation and annealing are investigated. The dependence of the α'-phase content on microhardness of austenitic steel is considered.

Change of magnetic properties of irradiated neutrons and electrons of austenitic steels in the processes of mechanical and term relaxation of internal elastic stresses

Authors: Максимкин Олег Прокофьевич, Отставнов М.А., Мережко М.С., Максимкин Олег Прокофьевич

Keywords: облучение, 12Х18Н10Т

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The effect of irradiation with neutrons and electrons, as well as temperature effects on stress relaxation processes in austenitic nickel-chromium steels has been investigated. The effect of an increase in the content of the ferromagnetic phase in irradiated samples deformed at cryogenic temperatures and annealed in the temperature range of 400 °C was found.

Modification of TiN coatings by electron irradiation

Authors: Журерова Л., Рахадилов Бауыржан Корабаевич, Кенесбеков А.Б., Кожанова Р.

Keywords: облучение, микротвердость, TiN

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This work presents the experimental results of structural and phase changes research study in TiN coatings under thermal and electron irradiation. Continuous electron irradiation of coated samples was performed on the ELV-4 accelerator. It was determined that electron irradiation with an electron energy of 1.3 MeV and an integral irradiation dose of 0.52·1019 e − /cm2 leads to an increase in the microhardness of TiN coatings by 20%. It has been established that the main factor in increasing the microhardness of the coating after electron irradiation in the above regimes is the formation of new phases, in particular the intermetallide of Co2Ti.

Calculated estimates of energy release and rates of 3H, 4He production in lithium kps with irradiation at the reactor IVG.1M

Authors: Скаков М.К., Кульсартов Т.В., Понкратов Ю.В., Прозорова И.В., Тажибаева И.Л., Кульсартов Т.В.

Keywords: облучение, ИВГ 1.M, литий, реактор, КПС

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The article presents the results of computational studies on the selection of the main parameters of an ampoule device for irradiating samples of lithium CPS; estimates of energy release and rates of the production of tritium and helium ions in lithium KPS when it is irradiated at the reactor IVG.1M. The urgency of the work is due to the prospects for using lithium in future TIR as a plasma-converting material. This work will promote the promotion of lithium technologies using KPS in modern tokamaks and directed at developing the basics of designing demonstration and commercial sources of future fusion energy. The International Science and Technology Center (Grant No. supported the work K-2204). Project “Reactor tests of lithium-ion-cooled batteries”.

Modification of YSZ properties by high energy ions of argon and oxygen

Authors: Хромушин И.В., Аксенова Т.И., Тусеев Т.Т., Ермолаев Ю.В.

Keywords: облучение, ионы аргона и кислорода, YSZ

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The influence of high-energy oxygen and argon ions irradiation on the structure and conductive properties of YSZ of various composition has been studied. It was shown that irradiation with YSZ ions causes minor failures in the structure of the near-surface regions of complex oxide, but does not cause any change in the type of crystal lattice. Apparently, the latter is due to the fact that both defects and implanted ions are mainly located quite deep from the surface of YSZ. Along with this, high radiation resistance of YSZ near-surface layers with the concentration of Y2O3 of 10 and 15 mol. %, is apparently due to the high concentration of oxygen vacancies in the initial unirradiated materials, which act as effective recombination centers for defects formed during irradiation. In the samples of ZrO2 + 3 mol. % Y2O3 composition, the concentration of vacancies is lower, and during irradiation there is a notable yield of oxygen from YSZ along with recombination. This leads to decrease in oxygen concentration and increase in zirconium concentration on the surface of the complex oxide. The values of the activation energies of the oxygen-ionic conductivity of the studied materials have been determined. It was noted that irradiation of YSZ with heavy ions in some cases can cause the improvement in the oxygen-ionic conductivity of these materials.

Changes of structural properties of Cu films as results of impact of low-power energy ions

Authors: Козловский А.Л., Калиекперов М.Е., Шлимас Д.И., Козловский А.Л., Кадыржанов К.К., Калиекперов М.Е., Шлимас Д.И.

Keywords: облучение, Cu пленки, кристалличность

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In this paper, we present the results of studies of the irradiation effect with low-energy He+2 ions with an energy of 30 keV (15 keV per charge) on the structural properties of Cu films. As a result of irradiation of initial samples with He+2 ions with a dose of 1·1016 ion/cm2 , a change in the Cu surface morphology of films is observed, and the formation of nanoscale inclusions of hexagonal shape is observed. An increase in the irradiation dose to 1·1017 ion/cm2 and higher leads to the formation of cracks and amorphous oxide inclusions on the sample surface. It is established that an increase in the irradiation dose leads to a decrease in the degree of crystallinity and a change in the basic crystallographic characteristics. 

The effect of irradiation with helium ions on microstructure and mechanical properties of EP-450 steel deformed at various temperatures

Authors: Максимкин Олег Прокофьевич, Цай Кира Викторовна, Рофман О.В.

Keywords: облучение, сталь ЭП-450, изохронный циклотрон У-150М, снижение деформационного упрочнения, одноосное растяжение

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This research examines mechanical properties and microstructural changes of EP-450 steel implanted with He. Steel samples were uniformly implanted with He+2 ions (40 MeV) to concentrations of 240 appm and 44 appm at 100 °С and 400 °С using U-150M isochronous cyclotron. Uniaxial tensile tests were performed at 25 °С, 400 °С and 800 °С. It was shown that at 100 °С mechanical characteristics of non-irradiated and irradiated EP-450 steel are less sensitive to temperature increase up to 400 °С. Steel samples irradiated at 400 °С show a decrease in strain hardening. Plasticity of the irradiated samples decreases at tensile temperatures 25 °С and 400 °С and almost independent on He concentration. High-temperature deformation of the irradiated material leads to similar plasticity as that for non-irradiated material which indicates that high temperature He embrittlement does not present in EP-450 steel at given conditions.