| 2021 №05 (09) |
DOI of Article 10.37434/tpwj2021.05.10 |
2021 №05 (11) |
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 NAS of Ukraine 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
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