Яровчук Алевтина Васильевна


Degree: канд. техн. наук

Position: старший научный сотрудник лаборатории радиационного материаловедения

Phone: +7 (7273) 86-68-00 (доп. 3-71)

Email: yarovchuk@mail.ru

Count articles: 4

Author articles


Pitting corrosion in cold-deformed 12Cr18Ni10Ti stainless steel

Authors: Максимкин Олег Прокофьевич, Цай Кира Викторовна, Яровчук Алевтина Васильевна, Рубан Сергей Владимирович

Keywords: сталь, коррозия, деформация, мартенсит

Organisation: РГП «Институт ядерной физики»

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The results of studies on pitting corrosion of 12Cr18Ni10Ti stainless steel austenized after tensile testing at room and low (−20 and −60°C ) temperatures are given. It has been established that local corrosion resistance of cold-deformed stainless steel depends on strain and temperature which determine structure-phase state of material. It is shown that at low degrees of deformation dislocation substructure formed of quasi-homogeneous honeycomb type which has a stabilizing effect on the state of the steel, resulting in increase of resistance to corrosion. Large degree of plastic deformation (>30%) along with the formation processes of high fragmented inhomogeneous structure in 12Cr18Ni10Ti steel initiate phase transformation γ → α΄ to form α΄-martensite, which negatively affects the corrosion resistance of the material.

Effect of Post-Radiation Annealing on Swelling, Magnetization and Corrosion Resistance of Austenitic Steel 12Cr18Ni10Ti, Irradiated in the Reactor BN-350

Authors: Максимкин Олег Прокофьевич, Яровчук Алевтина Васильевна, Максимкин Олег Прокофьевич

Organisation: РГП «Институт ядерной физики»

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The comparative study has been performed on the post-operation changes in the structural-phase state, magnetization, swelling and corrosion properties of the samples of structural reactor steel 12Cr18Ni10Ti, cut from the walls of the hexagonal ducts of the spent fuel assemblies from various elevations from the core center of the nuclear reactor BN-350. The studies of the aging processes in the highly irradiated corrosion-resistant austenitic steel showed that as the result of isochronous annealing in the region of 400÷450 °C we can observe the effect of magnetization increase, initiation of the processes of nucleation of defects of various morphology, the changes in their density and size, which determines the degree of swelling. The relationship has been established between radiation swelling with evolution of the defective structure, density, magnetization and corrosion resistance of austenitic steel.

Radiation relaxation of stresses in reactor steels irradiated by neutrons or pulse electrons

Authors: Максимкин Олег Прокофьевич, Яровчук Алевтина Васильевна, Максимкин Олег Прокофьевич, Шорт М.

Keywords: 12Х18Н10Т, Х18Н9Т, AISI 316

Organisation: РГП «Институт ядерной физики»

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Experimental results on the relaxation of internal stresses in structural stainless steels Х18Н9Т, 12Х18Н10Т and AISI 316 after neutron irradiation, effects of stationary or pulsed electrons of various powers are presented. It has been established that in steels irradiated with low neutron fluxes (1016 ÷ 1018 n/cm2 ), the deformation by extension as a result of relaxation phenomena is the martensitic γ → α transition begins at lower values of critical stresses than after austenization. At the same time, there is an anomalous effect of reducing the yield strength and reducing the amount of mechanical work expended on the destruction of the steel sample. The features of the relaxation of internal stresses and the formation of the α-phase in stainless steels under irradiation with electrons of various energies are revealed. It is shown that the radiation relaxation of internal stresses caused by the action of neutrons, pulsed or stationary electrons, changing the conditions for the formation of the α-phase, determines the level of mechanical and corrosion properties of irradiated stainless steel.

Thermal aging effect on intergranular corrosion and corrosion cracking resistance of neutron irradiated 12Cr18Ni10Ti austenitic steel

Authors: Максимкин Олег Прокофьевич, Яровчук Алевтина Васильевна, Рубан Сергей Владимирович, Отставнов М.А., Турубарова Л.Г.

Keywords: 12Х18Н10Т, нейтронное облучение, термическое старение, сопротивление коррозии, склонность к межкристаллитной коррозии

Organisation: РГП «Институт ядерной физики»

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The results of the studies of thermal aging effect on corrosion resistance of stainless reactor steel 12Cr18Ni10Ti in unirradiated and neutrons irradiated states have been presented in the paper. The tendency to intergranular corrosion increase with the increase of neutron exposure dose was revealed. A significant reduction in the maximum failure strain and the appearance of the martensite phase was observed during steel testing for corrosion cracking. The maximum content of the martensite phase is formed in the samples aged at 650 °C due to high diffusion mobility of the alloying elements and development of the sensitization process.