Electrometallurgy Today, 2025, №02

2025 №02 (05)

DOI of Article 10.37434/sem2025.02.06

2025 №02 (07)

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"Suchasna Elektrometallurgiya" (Electrometallurgy Today), 2025, #2, 37-47 pages

The effect of annealing on the structure and properties of welded joints of high-temperature pseudo-α-titanium alloy of Ti‒Al‒Zr‒Sn‒Mo‒Nb‒Si alloying system

S.V. Akhonin¹, V.Yu. Bilous¹, V.V. Pashynskyi², R.V. Selin¹, A.Yu. Severyn¹, E.L. Vrzhyzhevskyi¹

¹E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: belousvy@gmail.com
²Technical University «Metinvest Polytechnic» LLC. 80 Southern Highway, 69008, Zaporizhzhia, Ukraine

Abstract
The effect of furnace annealing after electron beam welding (EBW) and gas tungsten arc welding (GTAW) on the properties of welded joints of a pseudo-α-titanium alloy of the Ti‒Al‒Zr‒Sn‒Mo‒Nb‒Si system was investigated. A quality criterion was introduced, to compare the properties of welded joints in the as-welded state and after additional heat treatment, It was established that annealing promotes the formation of a finer microstructure of the metal in the welded joints of the high-temperature pseudo-α-titanium alloy of Ti‒Al‒Zr‒Sn‒Mo‒Nb‒Si alloying system produced by EBW, resulting in a tensile strength of 980 MPa, which is 95 % of the base metal strength. The impact toughness of the annealed welded joints remained high at 17.9 J/cm2. Annealing after GTAW also leads to microstructural refinement of the welded joints. A comparative analysis of the «quality coefficients» of EBW and GTAW welded joints demonstrated the superior combination of mechanical properties in EBW joints, both in the as-welded condition and after annealing. Furthermore, annealing enabled an improvement in the mechanical properties of EBW joints to levels comparable to those achieved with additional local heat treatment (LHT), without the need for LHT application. 15 Ref., 3 Tabl., 8 Fig.
Keywords: high-temperature titanium alloy, microstructure, mechanical properties, electron beam welding, gas tungsten arc welding

Received: 27.03.2024
Received in revised form: 24.04.2025
Accepted: 09.06.2025

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