Electrometallurgy Today, 2024, №04



2024 №04 (04)

DOI of Article 10.37434/sem2024.04.05

2024 №04 (06)

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Electrometallurgy Today (Suchasna Elektrometallurgiya), 2024, #4, 29-40 pages

Structure and properties of welded joints of heat-resistant titanium alloy of the system Ti–Al–Zr–Sn–Mo–Nb–Si produced by EBW

S.V. Akhonin¹, V.Yu. Bilous¹, E.L. Vrzhyzhevskyi¹, R.V. Selin¹, I.K. Petrychenko¹, S.L. Schvab¹, S.L. Antonyuk²

¹E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: belousvy@gmail.com
²SC «O.K. Antonov ANTK». 1 Mriya Str., 03062, Kyiv, Ukraine. E-mail: info@antonov.com

Abstract
Heat-resistant titanium-based pseudo-α-alloys have become widely applied in many sectors of modern industry, which is due to a high level of their specific mechanical properties at higher temperatures. Application of electron beam welding technology is the most rational when manufacturing parts and components from heat-resistant titanium alloys. Its special feature are high rates of cooling of the weld metal and HAZ, which complicates welding of heat-resistant titanium alloy Ti–6.5Al–5.3Zr–2.2Sn–0.6Mo–0.5Nb–0.75Si, where the high silicon content ensures lower plastic characteristics at room temperature. The influence of electron beam welding on the weld metal and HAZ structure, and on the mechanical properties of the heat-resistant titanium alloy Ti–6.5Al–5.3Zr–2.2Sn–0.6Mo–0.5Nb–0.75Si was studied. It was found that application of electron beam welding with local heat treatment at 750 °C leads to reduction of the size of packs with Widmanstatten morphology from 50…100 to 20…50 μm and increase of welded joint strength from 996 to 1041 MPa, which corresponds to base metal strength. 24 Ref., 2 Tabl., 14 Fig.
Keywords: heat-resistant titanium alloy, microstructure, mechanical properties, electron beam welding, local heat treatment

Received: 11.10.2024
Received in revised form:25.11.2024
Accepted: 12.12.2024

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