Determination of the Relationship between the Factor of Grain Size Factor and the Corrosion Rate of Structural Steel

Sokolov, R. A.; Новиков, В. Л.; Muratov, K. R.; Venediktov, Anatolii

doi:10.17212/1994-6309-2020-22.3-106-125

Cited by 3 publications

(3 citation statements)

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“…Структура материала анализировалась в программном комплексе SIAMS 800. Некоторые полученные результаты отражены в работах [10,11,15,16].…”

Section: методика исследованийunclassified

“…Ввиду того что на площадках промышленных предприятий в большинстве случаев оборудование работает с ускоряющими процесс коррозии агрессивными средами, наличие внутренних напряжений, влияющих на этот процесс, становится значительным фактором. Однако не стоит забывать, что в процессе коррозионного разрушения имеют место различные механизмы [8][9][10][11], связанные с наличием включений, величиной внутренних напряжений, дисперсностью материала и др. Влияние этих механизмов на коррозионный процесс неоднозначно, именно по этой причине необходимо четко дифференцировать оказываемое на коррозионные процессы воздействие со стороны напряжений второго рода.…”

Section: Introductionunclassified

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Influence of internal stresses on the intensity of corrosion processes in structural steel

Sokolov,

Muratov,

Venediktov

et al. 2023

Metal Working and Material Science

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Introduction. The behavior of metal in a corrosive environment can be ambiguous, which is due to the peculiarities of the corrosion process. Both external and internal factors influence the corrosion process. External factors are determined by temperature, humidity, type of corrosive medium, etc., while internal factors depend on the parameters of the system (material): the presence of inclusions, phase composition, structure, and the magnitude of internal residual stresses. Internal factors ambiguously affect the behavior of the material in a certain aggressive medium, which ultimately affects the time of corrosion damage of the material and, as a consequence, the time of operation of objects made of this material. Therefore, differentiation of the influence of various internal factors on the rate of corrosion process in an aggressive environment is a priority area of research. The purpose of the present work is to consider the influence of the magnitude of internal residual stresses on the rate of corrosion process in an aggressive medium — 5% sulfuric acid solution. The object of research conducted in the work is sheet rolled steel St3 as received after different magnitude of plastic deformation, from which the specimens under study were made. The methods of investigation: microstructural study of deformed specimens was carried out on optical microscope Olympus GX53; software SIAMS 800 was used to compare the structure of the obtained material with the atlas of microstructures, determine the score of grain structure, determine the anisotropy of the structure after deformation of the material; X-ray diffractometer DRON-7 was used to register diffraction patterns and determine internal stresses; laboratory scales SHIMADZU UW620h was used to measure the mass of the specimens under study; tensile strength of the material’s specimens was measured. Results and Discussion. The obtained results show that the plastic deformation of the material in the rolling direction has an ambiguous effect on the structure anisotropy. When the degree of plastic deformation increases, there is an ambiguous change in the grain anisotropy value, which is associated with the internal effects of the processes occurring in the material structure during plastic deformation, such as: sliding of the crystal lattice in the {111} <110> directions; the occurrence of reverse residual internal stresses due to the presence of inclusions in the steel structure. However, the degree of plastic deformation correlates quite well with the magnitude of internal residual stresses. The increase in the magnitude of internal residual stresses leads to an increase in the corrosion rate of structural steel St3 in 5 % hydrochloric acid solution. The obtained dependence is described by a linear equation with a high coefficient of determination, which indicates that there is a strong relationship between the magnitude of internal residual stresses and the rate of corrosion of the material. At the same time, the coefficient of influence of internal stresses on the corrosion rate is equal to 0.72, which additionally proves the existence of interrelation between the considered parameters.

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Section: методика исследованийunclassified

Section: Introductionunclassified

Influence of internal stresses on the intensity of corrosion processes in structural steel

Sokolov,

Muratov,

Venediktov

et al. 2023

Metal Working and Material Science

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“…Измерение твердости исследуемых образцов проводилось на твердомере по Виккерсу Indentec Зеренная структура анализировалась в программном комплексе «SIAMS 700» и «SIAMS 800». Некоторые результаты отражены в работах [16,17].…”

Section: методика исследованийunclassified

The effect of heat treatment on the formation of MnS compound in low-carbon structural steel 09Mn2Si

Sokolov¹,

Новиков²,

Kovenskij³

et al. 2022

Metal Working and Material Science

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Introduction. The properties of steels are determined by many factors, including the manufacturing process and subsequent treatment. Some features of these processes lead to the fact that in steel, apart from alloying elements added to obtain a certain level of physical and mechanical properties, there are also foreign impurities that enter it at various stages. Foreign elements can not only dissolve in the matrix, but also participate in the formation of particles of nonmetallic inclusions acting as defects. Its presence significantly affects the performance characteristics of the material. That is why it is necessary to understand the processes that lead to the appearance of nonmetallic inclusions and affect its shape. Purpose: to consider the effect of heat treatment, leading to the appearance of a ferrite-martensitic structure, on the shape and size of nonmetallic inclusions; to determine its influence on the physical and mechanical properties of the material. In the work, samples of rolled steel 09Mn2Si after heat treatment are studied. Research methods. To study the properties and structure of steel 09Mn2Si, the following methods were used: scanning electron microscopy – to study the structure of the material, chemical composition in the local area and the site under study and to determine the accumulation of impurities; SIAMS 800 software and hardware complex – to compare the structure of the material with the atlas of microstructures, to determine the score of the grain structure, differences in the structural and phase composition occurring during heat treatment; portable X-ray fluorescence analyzer of metals and alloys X-MET 7000 - to determine the chemical composition of the samples under study in percentage terms; Vickers hardness tester with a preload of 20 kg – to measure the hardness of the samples under study. Results and discussions. It is found that in the low-alloy low-carbon structural steel 09Mn2Si in most cases there are nonmetallic inclusions of the type of manganese sulfide formed during its manufacture. When this steel is heated to the temperatures of the intercritical transition, this compound is formed in the area of grain boundaries in the form of spherical inclusions. The presence of these inclusions significantly affects the strength and corrosion properties. Manganese sulfide acts as the point of the corrosion process initiation.

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Study of the corrosion properties of structural steels using magnetic characteristics

Sokolov

Novikov

Muratov

2022

Zavod. lab., Diagn. mater.

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Heterogeneities of the crystal structure and chemical composition, as well as the impurity elements forming inclusions cause deviations of the properties of test object from the required physical and mechanical parameters which significantly affects the reliability and service life of the product. We present the results of studying the susceptibility of structural steels to corrosion in aggressive environment using their magnetic characteristics. Structural-phase transformations occurred in steels under the effect of heat treatment change their properties, including magnetic and corrosion ones. Heat-treated 09G2S, St3, 15XSND steel samples were studied. In addition to the main magnetic parameter — coercive force, we also used spectral characteristics of the samples obtained using a remagnetization curve, magnetic hysteresis loop. The multi-parameter approach with harmonic components was used to identify the corrosion rate and coercive force correlation. Determination of the corrosion rate in this case can be reduced to classical problems of technical diagnostics. It is shown that a complex parameter based on harmonic components obtained using a magnetic hysteresis loop and the corrosion rate exhibit a pronounced correlation which provide developing a non-destructive method for predicting the corrosion resistance of structural steels. The results obtained can be used to improve the rapid method for determining the corrosion-hazardous zones of steels using the magnetic parameters.

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Determination of the Relationship between the Factor of Grain Size Factor and the Corrosion Rate of Structural Steel

Cited by 3 publications

References 0 publications

Influence of internal stresses on the intensity of corrosion processes in structural steel

Influence of internal stresses on the intensity of corrosion processes in structural steel

The effect of heat treatment on the formation of MnS compound in low-carbon structural steel 09Mn2Si

Study of the corrosion properties of structural steels using magnetic characteristics

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