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2021 №03 (06) DOI of Article
10.37434/sem2021.03.07
2021 №03 (08)

Electrometallurgy Today 2021 #03
SEM, 2021, #3, 42-48 pages

Influence of heat treatment on the structure and fracture mode of welded joints of sparsely-alloyed titanium alloy

Authors
S.G. Grigorenko, T.G. Taranova, V.A. Kostin, T.G. Solomijchuk, V.Yu. Bilous, E.L. Vrzhizhevskyi
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., Kyiv, 03150, Ukraine. E-mail: office@paton.kiev.ua

Abstract
Studied is the influence of preheating and further local heat treatment on the structure, fracture mode and properties of welded joints of sparsely-alloyed pseudo-β-titanium alloy of Ti–Al–Mo–Fe system. The structure of welded joints produced by electron beam welding and surfaces of fractures obtained after impact toughness testing of the samples were investigated. It is found that application of preheating and local heat treatment after electron beam welding allows avoiding formation of a metastable αʹ-phase in the welded joint and lowering the content of β-phase in the weld metal to 72 % that enables increasing the values of strength and ductility. Additional local heat treatment after welding with preheating leads to a more uniform arrangement of areas of brittle and ductile fracture on the fracture surface, and also promotes transformation of α-phase particles of different size and shape into a dispersion-strengthened structure that ensures a more favourable combination of strength, ductility and toughness. The strength of welded joint produced with preheating and local postweld heat treatment is on the level of 98 % of base metal strength. Ref. 12, Tabl. 1, Fig. 7.
Keywords: sparsely-alloyed titanium alloys; electron beam welding; ingot; structure; fracture mode; mechanical properties; local heat treatment

Received 14.06.2021

References

1. Lütjering, G., Williams, J.C. (2003) Titanium (Engineering materials and processes). Berlin, Springer-Verlag, 3. 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, 5.
4. (2004) EHK Technologies: Summary of emerging titanium cost reduction technologies. A study performed for US Department of Energy and Oak Ridge National Laboratory, Subcontract 4000023694, EHK Technologies, Vancouver, WA, USA.
5. Nochovnaya, N.A., Antashev, V.G. (2007) Titanium alloys of low-cost series and possibilities of their application. In: Proc. of Int. Conf. on Titanium in CIS. Kiev, IMP, 191-192 [in Russian].
6. Bania, P.J. (1993) Beta titanium alloys and their role in the titanium industry. Beta Titanium Alloys in the 90`s. TMS Publ., Warrendale, PA, 3-14.
7. Weiss, I., Semiatin, S.L. (1998) Thermomechanical processing of beta titanium alloys on overview. Mat. Sci. Eng. A, 243, 46-65. https://doi.org/10.1016/S0921-5093(97)00783-1
8. Akhonin, S.V., Bilous, V.Yu., Berezos, V.O. et al. (2020) Structure and properties of structural sparcely-doped titanium-based alloys produced by EBM. Suchasna Elektrometal., 4, 7-15 [in Ukrainian]. https://doi.org/10.37434/sem2020.04.02
9. Akhonin, S.V., Belous, V.Yu., Selin, R.V. et al. (2018) Electron beam welding and heat treatment of welded joints of high-strength pseudo-β titanium alloy VT19. The Paton Welding J., 7, 12-17. https://doi.org/10.15407/as2018.07.02
10. Akhonin, S.V., Bilous, V.Yu., Selin, R.V., Petrichenko, I.K. (2020) Heat treatment of high-strength pseudo-β-titanium alloy produced by EBM process and of its welded joints. Suchasna Elektrometal., 1, 14-25 [in Ukrainian]. https://doi.org/10.37434/sem2020.01.02
11. Hryhorenko, S.G., Achonin, S.W., Belous, W.Ju., Selin, R.W. (2016) Heat treatment effect on the structure and properties of electron beam welded joints made of high-alloy titanium. Biuletyn Instytutu Spawalnictwa, 5, 90-95. https://doi.org/10.17729/ebis.2016.5/12
12. Fellous, J. (1982) Fractography and atlas of fractograms. Ed. by M.L. Bernshtejn. Moscow, Metallurgiya [in Russian].

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