Electrometallurgy Today, 2020, №01



2020 №01 (01)

DOI of Article 10.37434/sem2020.01.02

2020 №01 (03)

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Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2020, #1, 14-25 pages

Heat treatment of high-strength pseudo-β-titanium alloy produced by ebm process and of its welded joints

S.V. Akhonin, V.Yu. Bilous, 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 effect of several kinds of heat treatment, such as annealing, water quenching, controlled annealing, slow cooling, on the structure and properties of base metal and welded joints of high-strength pseudo-β-titanium alloy, produced by electron beam welding and tungsten electrode argon-arc welding with through penetration was studied. Ingots of a round cross-section of 110 mm diameter from pseudo- β-titanium alloy of Ti–Al–Мо–V–Cr–Zr system were produced by the technology of cold hearth electron beam melting and portioned feed of liquid metal into a water-cooled mould. It is found that the most finely-dispersed structure in the base metal, weld metal and HAZ forms in the metal and joints subjected to water quenching with further ageing. Such heat treatment and structure provide the highest values of ultimate strength of the base metal on the level of 1300…1310 MPa, and of welded joints on the level of 1270…1285 MPa. Here, high values of impact toughness are preserved (23 J/cm2). Ref. 15, Tabl. 3, Fig. 12.
Keywords: pseudo-β-titanium alloys; welding; fusion; heat treatment; microstructure; mechanical features

Received 05.12.2019

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