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2021 №05 (09) DOI of Article
10.37434/as2021.05.10
2021 №05 (11)

Automatic Welding 2021 #05
Avtomaticheskaya Svarka (Automatic Welding), #5, 2021, pp. 62-69

Effect of modification of weld metal of high-strength low-alloy steels on their structure and properties

.A. Kostin, V.V. Zhukov, O.M. Berdnikova, V.V. Golovko, 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

The work studies the influence of modification of different compounds by dispersed particles on the structure, non-metallic 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 the maximum intensity of phase transformation allowed separating the influence of oxide, carbide and titanium-containing compounds on the structure and mechanical properties of the weld metal of high-strength low-alloy steels. The use of powders of TiO2, ZrO2 and MgO oxides promotes the formation of a dispersed structure of acicular ferrite (from 30 to 90%), which allows obtaining a favorable combination of high strength and toughness, especially at extremely low test temperatures (-40...– 60 °С) in the weld metal. 11 Ref., 5 Tabl., 9 Fig.
Keywords: high-strength low-alloy steels, austenite decay diagram, phase transformations, critical transformation temperatures, automatic welding, weld metal, modification, microstructure, mechanical properties


Received:09.04.2021

References

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