The Paton Welding Journal, 2023, №06



2023 №06 (07)

DOI of Article 10.37434/tpwj2023.06.01

2023 №06 (02)

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The Paton Welding Journal, 2023, #6, 3-7 pages

Fractal evaluation of grain boundaries branching in the structure of weld metal of low-alloy steels

V.V. Holovko, O.O. Shtofel, V.A. Kostin

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Abstract
Non-metallic inclusions, which are an integral part of welds, can facilitate the reduction in the sizes of structural grains, playing the role of crystallization centers of the weld pool metal. This helps to increase the strength values of the weld metal on the one hand. On the other hand, the crystalline lattice of grains on the grain boundaries is influenced by the force fields of both tangent crystallites, saturated with non-metallic inclusions, impurity atoms, dislocations, vacancies, has an increased energy of grain boundaries. These circumstances contribute to the fact that namely grain boundaries are the places of the highest probability of cracks origination and propagation. For the numerical description of the dualism of the influence of non-metallic inclusions on the weld metal structure, it is proposed to use methods of fractal analysis and metallographic analysis based on artificial intelligence. 7 Ref., 4 Tabl., 3 Fig.
Keywords: low-alloy steel, welding, weld metal, microstructure, fractal analysis, metallographic analysis, MIPAR software

Received: 31.05.2023
Accepted: 17.07.2023

References

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