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2024 №02 (06) DOI of Article
10.37434/sem2024.02.07
2024 №02 (08)

Electrometallurgy Today 2024 #02
Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2024, #2, 46-52 pages

Heat treatment influence on the structure and properties of Ti–28Al–7Nb–2Mo–2Cr titanium aluminide and its welded joints

S.V. Akhonin, V.Yu. Bilous, A.Yu. Severyn, R.V. Selin, I.K. Petrichenko

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 influence of furnace annealing on the structure of cast metal in 200 mm ingots from intermetallic titanium alloy Ti–28Al–7Nb–2Mo–2Cr produced by electron beam melting and of its welded joints produced by the method of electron beam welding was determined. It is established than the metal of 200 mm Ti–28Al–7Nb–2Cr–2Mo ingots based on titanium aluminide is readily welded under the conditions of application of such technological measures as preheating and local heat treatment. It is shown that annealing at the temperature of 1260 °C for 10 h led to formation of a uniform microstructure in the base metal, HAZ and weld metal, decomposition of the duplex structure and absence of regions with a two-phase (γ+α2)-lamel structure. Room temperature strength of welded joints after annealing is equal to 746 MPa or 98 % of base metal strength. 33 Ref., 1 Tabl., 5 Fig.
Keywords: titanium aluminide, electron beam welding, welded joints, duplex structure, lamellar structure, strength

Received: 15.03.2024
Received in revised form: 04.04.2024
Accepted: 10.06.2024

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