The Paton Welding Journal, 2022, №01



2022 №01 (05)

DOI of Article 10.37434/tpwj2022.01.06

2022 №01 (07)

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The Paton Welding Journal, 2022, #1, 26-32 pages

Influence of time of existence of molten pool in electron beam processes on the level of evaporation of elements with a high vapor tension

N.V. Piskun, E.L. Vrzhyzhevskyi, V.A. Kostin, T.G. Taranova, I.L. Bogaichuk, I.I. Statkevych

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 intermetallic Ті‒44Al‒5Nb‒3Cr‒1.5Zr alloy (at.%), developed and melted at the E.O. Paton Electric Welding Institute of the NAS of Ukraine, was studied. The processes of evaporation of elements with a high vapor tension, such as aluminium and chromium for two electron beam processes: melting and welding were studied. It was experimentally proven and confirmed by investigations that the use of directional crystallization by electron beam melting, which takes place in deep vacuum conditions, does not allow providing uniformity of structure along the length of the ingot, which is associated with evaporation of elements with a high vapor tension, such as aluminium and chromium. It was found that during electron beam welding of specimens of intermetallic Ті‒44Al‒5Nb‒3Cr‒1.5Zr alloy (at.%), cracks appeared, but, as was proved by X-ray spectral studies, evaporation of elements does not occur. The parameters of these two processes were compared and it was shown that the level of evaporation of elements with a high vapor tension in electron beam processes is influenced by the time of staying the material in a liquid state and the sizes of the molten zone.
Keywords: intermetallic alloy of TiAl system, electron beam melting, electron beam welding, evaporation, elements with a high vapor tension, molten zone, crystallization time

Received: 25.10.2021
Accepted: 07.02.2022

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