2022 №12 (04) DOI of Article
2022 №12 (06)

Automatic Welding 2022 #12
Avtomaticheskaya Svarka (Automatic Welding), #12, 2022, pp. 38-44

Influence of heat treatment on improvement of mechanical properties of welded joints of sparsely-doped titanium alloy Ti–2.8Al–5.1Mo–4.9Fe

S.V. Akhonin, V.Yu. Bilous, V.A. Kostin, S.G. Hrygorenko, O.L. Puzrin, E.L. Vrzhyzhevskyi

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

The most important advantage of pseudo-β-titanium alloys is their high strength, and the disadvantages include the high cost of alloying elements. Sparsely-doped alloys, such as LCB, Timetal 125, etc. were developed to lower the titanium alloys cost. This class of titanium alloys is promising for application in inexpensive structures. Development of welding technology and modes of heat treatment of such alloy joints is an important task. In this work investigations were performed of the surface of fractures in welded joints of titanium alloy of Ti–2.8Al–5.1Mo–4.9Fe system, obtained after impact toughness testing. It was found that local heat treatment in the vacuum chamber of specimens of welded joints of test titanium alloy Ti–2.8Al–5.1Mo–4.9Fe produced by EBW by mode 4 (LHT in a vacuum chamber at the temperature of 750 °С for 5 min) allows producing higher ductility properties of welded joints, and preventing post-weld cold cracking. Such heat treatment leads to a more uniform arrangement of ductile fracture areas on fracture surfaces. 12 Ref., 3 Tabl., 6 Fig.
Keywords: titanium, pseudo-β-titanium alloys, sparsely-doped titanium alloys, welded joints, welding, electron beam welding, local heat treatment, tungsten electrode, heat treatment, mechanical properties, fractures surfaces, quality criterion

Received: 08.12.2022


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