Automatic Welding, 2023, №04



2023 №04 (02)

DOI of Article 10.37434/as2023.04.03

2023 №04 (04)

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Avtomaticheskaya Svarka (Automatic Welding), #4, 2023, pp. 17-20

Fractal parametrization of branching baininitic structure of weld metal of high-strength low-alloy steels

V.V. Golovko, O.O. Stofel, 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

The results of the study on determination of the possibility of evaluating the parameters of bainitic structure of weld metal of high-strength low-alloy steels by the method of fractal analysis. The ability of evaluating the branching of bainitic structure using the fractal parameter D = ln(d)/lnN(d) is shown, where d is the size of a square cell, and N(d) is a number of cells that cover the studied fractal figure. For the investigated specimens, a correspondence between the fractal parameter of branching bainitic structure and the value of toughness of the weld metal was established. 5 Ref., 4 Tabl., 2 Fig.
Keywords: welding, low-alloy steel, microstructure, branching of bainitic structure, fractal analysis


Received: 12.04.2023

References

1. Holovko, V.V., Yermolenko, D.Yu., Stepanyuk S.M. et al. (2020) Influence of introduction of refractory particles into welding pool on structure and properties of weld metal. The Paton Welding J., 8, 1-7. https://doi.org/10.37434/tpwj2020.08.01
2. Bhadeshia H.K.D.H. Bainite in steels theory and practice third edition (2001) Maney Publishing is the trading name of W. S. Maney& Son LtdManey Publishing, Suite 1C, Joseph's Well, Hanover Walk, Leeds LS3 1AB, UK.451 Р.
3. Grabin, V.F., Denisenko, A.V. (1978) Physical metallurgy of welding and low- and medium-alloy steels. Kyiv, Naukova Dumka [in Russian].
4. Yang, Hong-Seok Design of Low-Carbon, Low-Temperature Bainite, Thesis for Doctor of Philosophy, Department of Ferrous Technology Graduate Institute of Ferrous Technology Pohang University of Science and Technology, Pohang, Korea, 26 September 2011, p 170.
5. Carney L.R., Mecholsky J.J. (2013) Relationship between Fracture Toughness and Fracture Surface Fractal Dimension in AISI 4340 Steel. Materials Sciences and Applications, 4, 258-267. https://doi.org/10.4236/msa.2013.44032

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