Electrometallurgy Today, 2021, №04



2021 №04 (07)

DOI of Article 10.37434/sem2021.04.08

2021 №04 (01)

---

Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2021, #4, 51-58 pages

Influence of heat treatment on the structure and properties of welded joints of high-strength titanium alloys based on β-phase

S.V. Akhnonin¹, V.Yu. Bilous¹, R.V. Selin¹, E.L. Vrzhyzhevskyi¹, I.K. Petrychenko¹, S.L. Antonyuk²

¹E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., Kyiv, 03150, Ukraine. E-mail: office@paton.kiev.ua
²SC «O.K. Antonov ASTC». 1 Tupolev Str., 03062, Kyiv, Ukraine. E-mail: info@antonov.com

Abstract
The properties of electron beam welded joints of sparsely-alloyed titanium pseudo-β-alloy of LCB type of Ti–2.8Al– 5.1Mo–4.9Fe alloying system and structural VT19 pseudo-β-alloy of Ti–3Al–5.5Mo–3.5V–5.5Cr–1Zr alloying system were studied. It was found that the joint structure consists of β-phase grains, in which dispersed precipitates of α-phase are present. The quantity of β-phase in the weld metal after electron beam welding is recorded on the level of 71….74 % in Ti–2.8Al–5.1Mo–4.9Fe alloy and of 74….87 % in Ti–3Al–5.5Mo–3.5V–5.5Cr–1Zr alloy. Local heat treatment of welded joints does not ensure lowering of β-phase content in the metal of the weld and HAZ, but allows producing almost full strength joints, with strength level of 98 % of that of the base metal in as-rolled condition. Hardening followed by aging for joints of Ti–2.8Al–5.1Mo–4.9Fe alloy is the most effective heat treatment, which allows increasing the joint strength up to 1204 MPa at impact toughness values on the level of 3.7...4.2 J/cm2. Ref. 14, Tabl. 4, Fig. 5.
Keywords: titanium; titanium alloys; welded joints; sparsely-alloyed; pseudo-β-alloys; heat treatment; annealing; hardening; aging; microstructure, mechanical properties

Received 24.11.2021

References

1. Lütjering, G., Williams, J.C. (2003) Titanium (Engineering materials and processes). Berlin, Springer-Verlag. https://doi.org/10.1007/978-3-540-71398-2
2. (2002) EHK Technologies: Opportunities for low cost titanium in reduced fuel consumption, improved emissions, and enhanced durability heavy-duty vehicles. Subcontract 4000013062, EHK Technologies, Vancouver, WA, USA.
3. Lavender, C.A. (2004) Low-cost titanium evaluation. Pacific Northwest National Laboratory, Richland, WA, USA.
4. (2004) EHK Technologies: Summary of emerging titanium cost reduction technologies. A study for US Department of Energy and Oak Ridge National Laboratory. Subcontract 4000023694, EHK Technologies, Vancouver, WA, USA.
5. Iliin, A.A., Kolachev, B.A., Polkin, I.S. (2009) Titanium alloys. Composition, structure, properties: Refer. Book. Moscow, VILS, MATI [in Russian].
6. Boyer, R.R., Williams, J.C. (2011) Developments in research and applications in the titanium industry in the USA. In: Proc. of 12th World Conf. on Titanium, I, 10-19.
7. Khorev, A.I., Belov, S.P., Glazunov, S.G. (1992) Physical metallurgy of titanium and its alloys. Moscow, Metallurgiya [in Russian].
8. Antipov, V.V. (2012) Strategy of development of titanium, magnesium, beryllium and aluminium alloys. In: Jubilee Sci.- Tech. Transact. on Aviation Materials and Technologies. Moscow, VIAM, 157-167 [in Russian].
9. Glazunov, S.G., Moiseev, V.N. (1974) Structural titanium alloys. Moscow, Metallurgiya [in Russian].
10. Bokshtejn, S.Z., Kishkin, S.T., Mirsky, L.M. (1971) Influence of thin structure developing in titanium during polymorphous (α+β)-transformation on diffusion mobility. Izv. AN SSSR. Metally, 5, 210-215 [in Russian].
11. Yu, Y., Hui, S.X., Ye, W.J., Xiong, B.Q. (2009) Mechanical properties and microstructure of an α+β titanium alloy with high strength and fracture toughness. Rare Met., 28(4). https://doi.org/10.1007/s12598-009-0068-5
12. Akhonin, S.V., Pikulin, O.M., Berezos, V.O. et al. (2019) Laboratory electron beam unit UE-208M. Sovrem. Elektrometall., 3, 15-22 [in Russian]. https://doi.org/10.15407/sem2019.03.03
13. Akhonin, S.V., Belous, V.Yu., Selin, R.V. et al. (2018) Electron beam welding and heat treatment of welded joints of highstrength pseudo-β titanium alloy VT19. The Paton Welding J., 7, 10-14. https://doi.org/10.15407/tpwj2018.07.02
14. Akhonin, S.V., Belous, V.Yu., Selin, R.V., Vrzhizhevsky, E.L. (2017) Influence of electron beam welding and local heat treatment on properties of welded joints of high-strength pseudo-β titanium alloy VT19. In: Proc. of 8th Int. Conf. on Beam Technologies in Welding and Processing of Materials (Ukraine, Odessa, 11-15 September 2017). Kiev, MAW, 7-10 [in Russian]. https://doi.org/10.15407/tpwj2018.07.02

---

Advertising in this issue:

---