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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

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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.

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 the electrical resistivity and magnetization of non-irradiated and irradiated Х18Н9 steel in deformation and annealing processes

Authors: Максимкин Олег Прокофьевич, Нұрғали Е.Е., Максимкин Олег Прокофьевич

Keywords: деформация, ВВР-К, Х18Н9, нейтронное облучение

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The results of experiments on the study of deformation and thermal changes in the electromagnetic properties of austenitic steel Х18Н9 subjected to neutron irradiation in a WWR-K nuclear reactor are presented and discussed. Particular attention is paid to the direct and inverse phase martensitic transformation. The effect of an additional increase in the amount of the ferromagnetic α-phase during annealing (~450°С) of irradiated, deformed at negative temperatures (−20 and −60 °C) of reactor steel is observed.

The determination of the parameters of the nucleation of the neck by the magnetic method in 12Х18Н10Т steel irradiated with neutrons

Authors: Максимкин Олег Прокофьевич, Максимкин Олег Прокофьевич

Keywords: деформация, 12Х18Н10Т, нейтронное облучение

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Some methods for determining the moment of localization of plastic deformation during static stretching of samples of constructional austenitic steels are considered. Based on the analysis of the obtained experimental results, a new magnetometric method has been proposed and described, its application for the determination of parameters describing the conditions of nucleation of the neck is illustrated by examples of unirradiated and neutron irradiated 12Х18Н10Т reactor steel.

Study of technogenic changes of geological media in geophysical parameters for the monitoring of nuclear energy facilities’ safety

Authors: Шайторов В.Н, Мариненко В.А., Ефремов М.В., Жолдыбаев А.К., Кушербаева Н.Н., Шульга М.В., Утегенова М.А., Алдабергенова Г.Н.

Keywords: деформация, мониторинг, сейсмический фон

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The paper presents the results of detection and tracing of structural and material changes in the soil of some nuclear energy facilities placements of Kazakhstan based on geophysical and athmogeochemical data. Spatial and temporal connection of changes of electrical resistivity, natural seismic noise, gas permeability of the sand-clay section rocks, connected with deformation processes has been demonstrated. The results of the testing of potential geophysical technologies and observational networks of monitoring at the test facilities are presented.

Influence of equal-channel angular compression modes on the formation of the structure and properties of the AMts alloy

Authors: Уазырханова Г.К., Баятанова Л.Б., Рахадилов Б.К., Ботабаева Г.Б., Жапарова М.С.

Keywords: деформация, прочность, алюминиевый сплав, структура, пластичность

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In this work the peculiarities of formation ultrathingrained structure and regularities of mechanical properties
improvement of aluminum alloy AMts, processed by equal channel angular pressing (ECAP). A systematic study of
changes in the structure and mechanical characteristics (microhardness and wear resistance) of the AMts aluminum alloy,
depending on the number of passes and the angle between the pressing channels at the ECAP. The work shows that by
varying the number of passes, different grain sizes and different values of mechanical characteristics can be obtained.
It was found that with a decrease in grain size, the microhardness of the AMts alloy increases by 4.5 times compared to
the initial state. It is shown that after ECAP-12, the mass loss decreases, which shows an increase in the wear resistance
of the AMts alloy by 13–14%. It was identified that after the ECAP of the AMts, the strength characteristics increase,
and the plasticity decreases when the transition to the ultrathingrained state.