Automatic Welding, 2025, №03

2025 №03 (03)

DOI of Article 10.37434/as2025.03.04

2025 №03 (05)

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"Avtomatychne Zvaryuvannya" (Automatic Welding), #3, 2024, pp. 23-32

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

V.V. Holovko, V.А. Kostin, V.V. Zhukov

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

Research was conducted to study the influence of inoculation of the aluminum, 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 beginning and end of the bainitic transformation. Both the beginning and end 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 end 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. 12 Ref., 6 Tabl., 6 Fig.
Keywords: welding, microstructure, dispersed oxides, weld pool inoculation, bainitic transformation


Received: 31.10.2024
Received in revised form: 19.03.2025
Accepted: 18.04.2025

References

1. Gubenko, S.I., Parusov, V.V., Derevyanchenko, I.V. (2005) Nonmetallic inclusions in steel. Dnipro, ART-PRESS [in Russian].
2. Goldstein, Ya.E., Mizin, V.G. (1956) Modification and microalloying of cast iron and steel. Moscow, Metallurgiya [in Russian].
3. Shpis H.-I. (1971) Behavior of non-metallic inclusions in steel during crystallization and deformation. Moscow, Metallurgiya [in Russian].
4. Popovich, V., Kondir, A., Pleshakov, E. et al (2009) Technology of structural materials and materials science. Practical work. Lviv, Svit [in Ukrainian].
5. Bokshtejn, B.S., Kopetsky, I.V., Shvindlerman, L.S. (1986) Thermodynamics and kinetics of grain boundaries in metals. Moscow, Metallurgiya [in Russian].
6. Gulyaev, A.P. (1977) Metals science. Moscow, Metallurgiya [in Russian].
7. Rohrer, G.S. (2011) Grain boundary energy anisotropy: A review. J. Mater. Sci., 46, 5881–5895. DOI: https://doi.org/10.1007/s10853-011-5677-3
8. Rohrer, G.S., Anthony, J.G., Rollett, E.D. (2008) A model for the origin of anisotropic grain boundary character distributions in polycrystalline materials. Applications of Texture Analysis, 17, 10. DOI: https://doi.org/10.1002/9780470444214.ch36
9. Panasyuk, A.D., Fomenko, V.S., Glebova, H.G. (1986) Stability of non-metallic materials in melts. Kyiv, Naukova Dumka [in Russian].
10. ISO 14171:2008(E) Welding consumables – Wire electrodes and wire-flux combinations for submerged arc welding of non alloy and fine grain steels – Classification.
11. ISO 17639:2003 Destructive tests on welds in metallic materials – Macroscopic and microscopic examination of welds.
12. IIW Doc. No. lX-1533-88 / IXJ-123-87 Revision 2 / June 1988 Guide to the light microscope examination of ferritic steel weld metals.