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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.

Structure and surface morphology of R6M5 steel after electrolyte-plasma treatment

Authors: Скаков Мажын Канапинович, Зарва Денис Борисович, Гулькин Александр Владимирович, Рахадилов Бауыржан Корабаевич

Keywords: сталь, азотирование

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In article influence of nitriding on the structure and morphology of R6M5 high-speed steel by electrolytic-plasma treatment was study. It is shown that after nitriding by electrolytic-plasma treatment on the R6M5 steel surface formation of small pores, microdefects and fine inclusion. It is found experimentally that R6M5 steel surface after electrolytic-plasma nitriding at 550°C temperature formed diffusion strengthened layer with Fe4N-monophasic nitride (γ’-phase). The content of nitrogen on structural components after nitriding was determined. It is revealed that modified surface differs by having greater magnitude of the surface imperfection.

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.