Випуск 105

Постійне посилання зібранняhttps://dspace.khadi.kharkov.ua/handle/123456789/21287

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Перегляд Випуск 105 за Автор "Hlushkova, D."

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    Dependence of the properties of the Fe-Cr-Ni alloy on the composition and properties
    (Харківський національний автомобільно-дорожній університет, 2024) Hlushkova, D.; Глушкова, Д. Б.
    This study employed a multifractal approach to assess the heterogeneous structure of the Fe-Cr-Ni alloy. Goal. The calculation of the spectrum of dimensionalities for microstructural elements (pearlitic matrix, carbides, and graphite) was conducted using the Rényi formula. Methodology. New relationships were established between the structure and properties of the alloy (such as hardness and impact strength), which are described by models allowing prediction of properties from microstructure images. Results. Most of the derived correlations exhibit a linear nature, indicating that not only does the percentage content of a particular structural element influence its properties, but also the shape of the element, as characterized by its fractal dimension, contributes to those properties. Analytical method that can be useful for assessing and improving the characteristics of alloys. Practical value. The essence of the work has a practical value particularly when precise determination of properties is critically important for their application in various fields of science and engineering.
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    Development and properties of new powder materials
    (Харківський національний автомобільно-дорожній університет, 2024) Hlushkova, D.; Глушкова, Д. Б.
    The study analyzed powder materials to obtain wear-resistant coatings. Field tests for wear resistance were conducted using the method of friction between two surfaces. The tests were carried out on the universal test bench SMC-2 at a rotation speed of 200 rpm. A pressure of 100 kgf was applied to the test sample. Goal. The wear resistance test cycle comprised 200,000 revolutions, with lubrication provided through the drop method. Special powders were used in the experiment, including PG-SR3, PN55T45, and PR-Ni70Cr17S4R4 + 20 % PT-Al5N with a PT-Al5N under layer. Methodology. The selection of wear-resistant coatings was based on the analysis of the following properties: adhesion strength of the coating to the base material, wear resistance of the coatings, hardness, and porosity. Results. Metallographic analysis of the structure of plasma coatings obtained from powders PG-SR3, PN55T45, and PR-Ni70Cr17S4R4 + 20% PT-All5N with three different plasma heater power levels (10 kW, 15 kW, and 20 kW) indicated that the densest and most reliable coating among those studied is the coating made from PR-Ni70Cr17S4R4 + 20 % PT-Al5N powder. Practical value. Therefore, there is no need to increase the heater power beyond 15 kW when spraying this type of powder. The research concluded that when obtaining wear-resistant coatings, the optimal choice is PR-Ni70Cr17S4R4 + 20 % PT-All5N powder with a PT-Al5N under layer.