New Approaches in Study of Inhomogeneity of Heterogeneous Structures

Скобло, Т. С.; Klochko, O. Yu.; Belkin, E. L.; Sidashenko, A. I.

doi:10.15407/mfint.40.02.0255

Cited by 8 publications

(5 citation statements)

References 6 publications

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“…New methods for the study of various structures formed in chromium-containing carbon alloys [25], which allow to predict changes in the local heterogeneity of structural components through various processing operations using computer optical-mathematical evaluation has been improved. Computer analysis of images of metallographic structure evaluates the heterogeneity of cast iron with high chromium content due to the distribution of the degree of dispersion.…”

Section: Analysis Of Literature Data and Problem Statementmentioning

confidence: 99%

The Influence of Titanium as a Desferoidizing Element on the Stability of Production of Magnesium Cast Irons with Compacted Graphite

Аулин¹,

Kropivny²,

Kuzyk³

et al. 2021

Tribol. Ind.

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The thermodynamic calculations and the obtained dependence of the Gibbs energy of the reactions of formation of titanium oxide, titanium sulfide, titanium nitride and titanium carbide in the melt of magnesium cast iron on their concentrations and melt temperature have been presented in the article. It has been shown that titanium, regardless of the concentration in melt, will primarily perform a deoxidizing effect, interacting with the oxygen. The lower negative values of the Gibbs energies are characterized by the reactions of the interaction of titanium with sulfur, at a concentration of the latter 0.01%, which indicates a decrease in the probability of such reaction occurrence. From a thermodynamic point of view, the reactions of titanium nitride and carbide formation are less probable. The values of the Gibbs energy of the interaction reaction of titanium depend to a large extent on the melt temperature. It has been found that for a more complete realization of the desulfurizing properties of titanium, it is advisable to enter the composition of cast iron during melting and overheating, when the melt temperature reaches maximum values. The optimal conditions for obtaining magnesium cast irons with compacted graphite has been determined. It has been found that the addition of titanium to magnesium cast iron, as a desferoidizing element containing 0.035% S, has a positive effect on stabilizing the formation of compacted graphite.

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Section: Analysis Of Literature Data and Problem Statementmentioning

confidence: 99%

The Influence of Titanium as a Desferoidizing Element on the Stability of Production of Magnesium Cast Irons with Compacted Graphite

Аулин¹,

Kropivny²,

Kuzyk³

et al. 2021

Tribol. Ind.

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“…После испытаний была выполнена оптико-математическая оценка формируемых фаз по базовой методике в соответствии с ранее проведенными исследованиями [8][9][10][11][12][13][14][15][16]. Для этого была дополнительно предложена специальная компьютерная программа на основе интервалов относительной нейтральности абсолютной величины лапласианов и дивергенций, расчет которых производили по пятиточечной разностной схеме, представленной на рис.…”

Section: материалы и методика исследованийunclassified

“…Нейтральности абсолютных величин лапласианов описывают диффузию химических элементов. Установлено, что такой подход позволяет комплексно оценить влияние различных факторов на структурообразование на поверхности трения материала, в том числе и на уровень твердости и микротвердости [8]. Проведенные исследования позволяют оценить изменения, происходящие на поверхности трения поршневых колец в результате определенной величины нагружения, и установить связь с результатами испытаний.…”

Section: L C C C C Cunclassified

“…Такой метод позволяет выявить зависимости между параметрами эксплуатации и формируемой структурой в контактирующих поверхностях колец, которые могут быть оценены по аппроксимации цифровых изображений изделий. Данный способ позволяет также оценить степень и характер формируемых напряжений и локально выявить зону их концентрации [8][9][10][11][12][13][14][15][16] по изменению структурной анизотропии.…”

Section: Introductionunclassified

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Optical-Mathematical Analysis of Structuration Modeling of Hardened Surfaces of Piston Rings during Operation

Скобло¹,

Sidashenko²,

Garkusha³

et al. 2019

Metallofiz. Noveishie Tekhnol.

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Изучено влияние технологии упрочнения поршневых колец многослойным ионно-плазменным покрытием TiN/CrN. Выявлены особенности их изнашивания при скорости скольжения 1,3 м/с, которая способствует максимальным изменениям. Показано, что при таких условиях испытаний в результате упрочнения в 15 раз повышается износостойкость. Методом оптико-математического анализа выявлены особенности структуризации поверхности трения, которые представляют собой формируемые поперечные и продольные полосы. Широкие поперечные полосы (∼ 20 мкм), характерны для зоны трения кольца с покрытием TiN/CrN и они определяют высокую степень сопротивления изнашиванию.

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“…The main performance characteristics of many cast products are determined mainly by the physical and mechanical properties of their surface layers [1,2], macro-and microstructure [3,4].…”

Section: Introductionmentioning

confidence: 99%

Graphitizing modification of the axial zone of cast iron rolling rolls in the liquidus-solidus temperature range

Khrychikov¹,

Meniailo²,

Semenov³

et al. 2023

Nauk. visn. nat. hirn. univ.

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Purpose. To develop a method for calculating a process of graphitizing modification of unsolidificated liquid-solid zone to reduce transcrystallinity of the macrostructure and the amount of cementite in the center of castings. Methodology. The duration of solidification of the castings was determined by the kinetic curves of liquidus, solidus and pouring boundary in coordinates of relative thickness of the solidified metal layer – the parametric criterion of Gulyaev. Findings. A methodology for the process of modification of the axial zone of rolling was developed, the mass and time of adding aluminum were determined according to the amount of liquid-solid phase that remains after the solidification of the working layer. On the example of a rolling roll weighing 1115 kg, 0.488 kg of aluminum was added into liquid-solid zone after the working layer solidified. Movement of aluminum to the front of crystallization is provided by centrifugal forces and adding of aluminum along the height of the roll. Originality. For the first time, the kinetic curves of liquidus, solidus and pouring boundary have been plotted in coordinates of the relative thickness of the solidified metal layer x/R and /R2 – the parametric criterion of Gulyaev for rolled cast iron alloys cooled in chill-sand molds of various sizes. A methodology was developed for calculating the process of aluminum modification of the axial zone of rolling rolls after solidification of the working layer in the barrel which was set at the pouring boundary. The amount of aluminum depends on the remains of the liquid-solid phase. Practical value. Graphitizing modification reduces transcrystallinity of the macrostructure and the amount of cementite in the axial zone of castings. A promising direction for further development is the development of new methods for manufacturing castings due to physical and mechanical effects on the two-phase zone, deoxidation and alloying of the central zones of castings.

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New Approaches in Study of Inhomogeneity of Heterogeneous Structures

Cited by 8 publications

References 6 publications

The Influence of Titanium as a Desferoidizing Element on the Stability of Production of Magnesium Cast Irons with Compacted Graphite

The Influence of Titanium as a Desferoidizing Element on the Stability of Production of Magnesium Cast Irons with Compacted Graphite

Optical-Mathematical Analysis of Structuration Modeling of Hardened Surfaces of Piston Rings during Operation

Graphitizing modification of the axial zone of cast iron rolling rolls in the liquidus-solidus temperature range

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