TPWJ, 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: email@example.com
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.
high-strength low-alloy steels, austenite decomposition diagram, phase transformations, critical transformation
temperatures, automatic welding, weld metal, modification, microstructure, mechanical properties
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