The Paton Welding Journal, 2025, №06

2025 №06 (01)

DOI of Article 10.37434/tpwj2025.06.02

2025 №06 (03)

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The Paton Welding Journal, 2025, #6, 9-18 pages

Dispersed oxides influence on the kinetics of the weld metal structural transformations

V.V. Holovko, V.A. Kostin, V.V. Zhukov

E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: v_golovko@ukr.net

Abstract
Research was conducted to study the influence of inoculation of the aluminium, titanium, magnesium, and zirconium dispersed refractory oxides into the weld pool on the modification of the metal structure in low-alloy steel welds. It is shown that the inoculation of refractory oxides into the weld pool increases the temperature at which the bainitic transformation ends and significantly reduces its temperature range. This trend coincides with the size of the wetting angle between the oxide and liquid iron. Increasing the content of inoculants in the weld pool liquid metal from 0.1 to 0.2 % affects the temperatures of the start and finish of the bainitic transformation. Both the start and finish temperatures are increased, that is, the formation of bainite occurs in the higher temperatures region, and the temperature range of this region narrows (the kinetics of transformation increases). An increase in the temperature of the finish of the bainitic transformation and a reduction in its temperature range cause an increase in the acicular ferrite content in the weld metal structure, which corresponds to an increased impact energy level of the weld metal.
Keywords: welding, microstructure, dispersed oxides, weld pool inoculation, bainitic transformation

Received: 31.10.2024
Received in revised form: 19.03.2025
Accepted: 25.06.2025

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Suggested Citation

V.V. Holovko, V.A. Kostin, V.V. Zhukov (2025) Dispersed oxides influence on the kinetics of the weld metal structural transformations. The Paton Welding J., 06, 9-18.

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