Automatic Welding, 2017, №07



2017 №07 (08)

DOI of Article 10.15407/as2017.07.09

2017 №07 (01)

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Avtomaticheskaya Svarka (Automatic Welding), #7, 2017, pp. 53-58
 

Influence of preheating parameters and local heat treatment on structure and properties of dispersion-strengthened joints of silicon-containing titanium alloys made by electron beam welding

S.V. Akhonin, E.L. Vrzhizhevsky, V.Yu. Belous and I.K. Petrichenko

E.O. Paton Electric Welding Institute, NASU 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
Abstract
Titanium alloys have high strength and corrosion resistance in a broad temperature range. When developing promising alloys, it is necessary to increase both working temperatures of parts and components of future engines, and their specific strength. The work is a study of the influence of preheating and local heat treatment on the structure and properties of EB welded joints of experimental silicon-containing titanium alloys, namely pseudo a-alloy Ti–5.6Al–2.2Sn–3.5Zr–0.4Mo–1V–0.6Si and (a + b)-alloy Ti–4.3Al–4.4Sn–6Zr–1.6Mo–0.7V–4.3Nb–0.4Si. Welded joints of dispersion-strengthened titanium (a + b)-alloy Ti–4.3Al–4.4Sn–6Zr–1.6Mo–0.7V–4.3Nb–0.4Si have higher ultimate strength, reaching 1277 MPa that corresponds to 90 % of that of the alloy proper. Long-term strength s₁₀₀ at 600 °C temperature of welded joint of Ti–4.3Al–4.4Sn–6Zr–1.6Mo–0.7V–4.3Nb–0.4Si titanium alloy is equal to about 260 MPa that is on the level of 93 % of long-term strength of base metal. 12 Ref., 4 Figures, 3 Tables.
 
Keywords: titanium, titanium alloy, dispersion strengthening, electron beam welding, structure, properties, strength, long-term strength
 
 
Received:                15.05.17
Published:               01.09.17
 
 
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