Fractal Analysis of Structural and Phase Changes in the Metal of Welded Steam Pipe Joints

Garashchenko, Yaroslav; Glushko, A.V.; Kobets, Olena; Harashchenko, Olena

doi:10.1007/978-3-030-77719-7_4

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…Therefore, "fractal geometry" [1] proposed at the end of the 20th century by B. Mandelbrot aroused great interest among researchers. To date, numerous works have confirmed the fractal nature of the structure of metals [2,3], rubber [4], wood [5], and rocks [6].…”

Section: Introductionmentioning

confidence: 99%

Fractal dimension of the morphology on differently oriented surfaces of coal preparations

Bezruchko,

Pymonenko,

Baranovskyi

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Choosing the surface of a lump section was justified to determine the degree of metamorphism by the index of gray shade intensity. The main method is optical spectroscopy using a video-optical complex MBI-11, NB 200 with subsequent digital computer processing and calculation of the fractal dimension (Scope photo software) of microphoto images of coal matter preparations by lump sections. The values for the index of gray shade intensity of photographic images of surfaces (section, bedding, cut) for lump sections based on samples of coals of various grades were analyzed. It has been established that the average values of the degree of metamorphism indices for different surfaces of the preparation differ, which is confirmed by low correlation coefficients: 0.585 (section-bedding), 0.666 (section-cut), 0.462 (cut-bedding). It has been found that the fractal dimension, which characterizes the complexity of the morphology of the surfaces under study, reflects an increase in the amount and orderliness of hydrocarbons associated with a change in the degree of metamorphism. It was proven that its most natural decrease related to an increase in the degree of metamorphism, is observed on surfaces perpendicular to the bedding (section).

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Section: Introductionmentioning

confidence: 99%

Fractal dimension of the morphology on differently oriented surfaces of coal preparations

Bezruchko,

Pymonenko,

Baranovskyi

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Metallographic Determination of the Number and Sizes of Grains Depending on Structural and Phase Changes in the Metal of Welded Steam Pipe Joints

Harashchenko

Dmytryk

Berezutskyi

et al. 2022

Lecture Notes in Mechanical Engineering

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Structure formation of Np-30KhGSA alloy in wire and arc additive manufacturing

Anosov,

Shatagin,

Chernigin

et al. 2023

Izv. vysš. učebn. zaved., Čern. metall.

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The use of metallic products 3D-printing is a modern, promising technology that improves production efficiency. However, using this technology is associated with a number of problems, for example, with increased microstructural heterogeneity and defects in metal. Therefore, it is necessary to carry out researches to identify 3D-printing modes ensuring the most homogeneous, stable and non-defect structure. In this work, a study was made of the process of structure formation of 30KhGSA steel in the process of Wire and Arc Additive Manufacturing (WAAM) under various printing modes. Microstructural analysis, microhardness measurement and fractal analysis were used for assessment of the obtained billets. In all surfacing modes, a significant structural inhomogeneity of the deposited billet was revealed, which is explained by the thermal effect of the deposited layer on the already crystallized metal. Nevertheless, we found the mode that gives the most favorable microstructure in terms of its uniformity and equiaxed grains. With an increase in WAAM heat input values, an increase in the productivity of the process is observed and a decrease in the number of pores in the material is recorded. However, when the heat input of the surfacing process exceeds 1000 J/mm, the structural inhomogeneity of the material increases and its microhardness significantly decreases. Based on the studies, as a WAAM 3D-printing mode for Np-30KhGSA alloy, a mode with a heat input of about 920 J/mm can be chosen, which provides the lowest structural inhomogeneity and a sufficiently high productivity of the growth process with the absence of defects in the form of pores and elements of not melted wire.

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Fractal Analysis of Structural and Phase Changes in the Metal of Welded Steam Pipe Joints

Cited by 3 publications

References 14 publications

Fractal dimension of the morphology on differently oriented surfaces of coal preparations

Fractal dimension of the morphology on differently oriented surfaces of coal preparations

Metallographic Determination of the Number and Sizes of Grains Depending on Structural and Phase Changes in the Metal of Welded Steam Pipe Joints

Structure formation of Np-30KhGSA alloy in wire and arc additive manufacturing

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