The Paton Welding Journal, 2024, №06



2024 №06 (05)

DOI of Article 10.37434/tpwj2024.06.06

2024 №06 (01)

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The Paton Welding Journal, 2024, #6, 45-51 pages

Influence of heat treatment 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 NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: titan.paton@gmail.com

Abstract
The influence of furnace annealing on the structure of cast metal in ingots of 200 mm diameter of the intermetallic Ti‒28Al‒7Nb–2Mo‒2Cr titanium alloy produced by the method of electron beam melting and its welded joints produced by the method of electron beam welding was determined. It was determined that the EBM metal produced from the ingots of 200 mm diameter is satisfactorily welded under the conditions of applying such additional technological measures as preheating and local heat treatment. It is shown that annealing at the temperature of 1260 °C for 10 h led to the 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)-lamellar structure. The room temperature strength of welded joints after annealing is equal to 746 MPa or 98 % of the base metal strength.
Keywords: titanium aluminide, electron beam welding, welded joints, duplex structure, lamellar structure, strength

Received: 15.03.2024
Received in revised form: 10.06.2024
Accepted: 22.07.2024

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Suggested Citation

S.V. Akhonin, V.Yu. Bilous, A.Yu. Severyn, R.V. Selin, I.K. Petrichenko (2024) Influence of heat treatment on the structure and properties of Ti‒28Al‒7Nb‒2Mo‒2Cr titanium aluminide and its welded joints. The Paton Welding J., 06, 45-51.

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