The Paton Welding Journal, 2021, #5, 57-64 pages
Effect of modification of weld metal of high-strength low-alloy steels on their structure and properties
V.A. Kostin, V.V. Zhukov, O.M. Berdnikova, V.V. Holovko and O.S. Kushnaryova
E.O. Paton Electric Welding Institute of the NASU.
11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
Abstract
The work studies the influence of modification of different compounds by dispersed particles on the structure, nonmetallic
inclusions, their size and distribution, change of phase transformation temperatures and mechanical properties of
weld metal joints of high-strength low-alloy steels. It is shown that the use of the temperature of maximum intensity
of phase transformations allowed separating the influence of oxide, carbide and titanium-containing compounds on the
structure and mechanical properties of weld metal of high-strength low-alloy steels. The use of powders of TiO2, ZrO2
and MgO oxides promotes formation of a dispersed structure of acicular ferrite (from 30 to 90 %), which allows obtaining
a favourable combination of high strength and impact toughness, especially at low extremely test temperatures
(‒40‒ ‒60 °C) in the weld metal. 11 Ref., 5 Tables, 9 Figures.
Keywords: high-strength low-alloy steels, austenite decomposition diagram, phase transformations, critical transformation
temperatures, automatic welding, weld metal, modification, microstructure, mechanical properties
Received 09.04.2021
References
1. Grigorenko, G.M., Kostin, V.A., Golovko, V.V., Zhukov, V.V. (2016) Influence of modificator nanoparticles on kinetics of transformations in weld metal of high-strength low-alloy steels. Dopovidi NANU, 7, 70-77 [in Russian].
https://doi.org/10.15407/dopovidi2016.07.0702. (2018) Science about materials, achievements, prospects. Ed. by L.M. Lobanov. Kyiv, Akademperiodyka, Vol. 2 [in Ukrainian].
3. Poznyakov, V.D. (2017) Welding technologies for production and repair of metal structures from high-strength steels. Bulletin of the National Academy of Sciences of Ukraine, 1, 65-73.
4. Rashid, M.S. (1980) High-strength, low-alloy steels. Science, 208, 862-869.
https://doi.org/10.1126/science.208.4446.8625. Rees, G.I., Bhadeshia, H.K.D.H. (1994) Thermodynamics of Acicular Ferrite Formation. Materials Science and Technology, 10, 5. 353-358.
https://doi.org/10.1179/mst.1994.10.5.3536. Yang, J.R., Bhadeshia, H.K.D.H. (1986) Thermodynamics of the acicular ferrite transformation in weld metals. Advances in welding science and technology. Proceedings of an International Conference on Trends in Welding Research, Gatlinburg, Tennessee, USA, May 18-22, 1986. ASM International, Materials Park, Ohio.
7. Kostin, V.A., Grigorenko, G.M., Golovko, V.V., Zhukov, V.V., Filipchuk, T.N. (2011) Physical modeling of structural transformations in heat affected zone metal of pipe steels with ferritic-bainitic structures. Zb. Nauk. Prats of Nats. Universytetu Korablebuduvanniya, 3, 36-44 [in Russian].
8. Nejmark, V.E. (1977) Modified steel ingot. Moscow, Metallurgiya [in Russian].
9. (2020) Influence of introduction of refractory particles into welding pool on structure and properties of weld metal. The Paton Welding J., 8, 8-14.
https://doi.org/10.37434/tpwj2020.08.0110. Bhadeshia, H.K.D.H. (2001) Bainite in Steels - Transformation, Microstructure and Properties (Second Edition). London, Institute of Materials Communication Ltd.
11. Berdnikova, O., Hryhorenko, G., Holovko V. (2019) Features of Bainite Structure in the Low-Alloy Steel Weld Metal with Dispersed Inoculants Modification, 2019. Sumu, SumDU, pp. 291-294.
https://doi.org/10.1109/NAP47236.2019.216961
Suggested Citation
V.A. Kostin, V.V. Zhukov, O.M. Berdnikova, V.V. Holovko and O.S. Kushnaryova (2021) Effect of modification of weld metal of high-strength low-alloy steels on their structure and properties.
The Paton Welding J., 05, 57-64.