Electrometallurgy Today, 2022, №02



2022 №02 (04)

DOI of Article 10.37434/sem2022.02.05

2022 №02 (06)

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Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2022, #2, 33-38 pages

Metallurgical processes in the weld metal at electron beam welding of 01570 aluminium alloy

V.V. Skryabinskyi¹, V.M. Nesterenkov¹, M.O. Rusynyk¹, A.V. Mykytchyk²

¹E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., Kyiv, 03150, Ukraine. E-mail: office@paton.kiev.ua
²SC «International Center for Electron Beam Technologies of the E.O. Paton Electric Welding Institute of the NAS of Ukraine». 68 Antonovych str., 03150, Kyiv

Abstract
Scandium and zirconium content was determined in different areas of welded joints of stamped semi-finished products of 01570 aluminium alloy produced by electron beam welding. It was found that dissolution of not only secondary, but also of part of primary Al₃(Sc, Zr) intermetallics, contained in the base metal, takes place in the weld pool. The quantity of scandium dissolved in the liquid metal, is determined by the time of the pool existence. Further on, scandium is completely or partially fixed in the oversaturated solid solution, depending on the hardening rate during weld metal cooling. At 0.10…0.12 % concentration of scandium dissolved in the weld pool, its complete transition into an oversaturated solid solution ensures hardening at not less than 5∙10₂ ºС/s rate. It is shown that approximately 50 % scandium, contained in 01570 alloy, participates in hardening of the stamped semi-finished products. The remaining scandium is present in the composition of primary intermetallics. Ref. 11, Tabl. 4, Fig. 4. Key words: electron beam welding; aluminium alloy; hardening; artificial aging; intermetallics

Received 12.04.2022

References

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