Eng
Ukr
Rus
Print

2021 №02 (04) DOI of Article
10.37434/sem2021.02.05
2021 №02 (06)

Electrometallurgy Today 2021 #02
SEM, 2021, #2, 32-39 pages

Influence of heat treatment on the structure and mechanical properties of sparsely-doped titanium alloy Ti–2.8Al–5.1Mo–4.9Fe

Authors
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., Kyiv, 03150, Ukraine. E-mail: office@paton.kiev.ua

Abstract
Possibility of strengthening the metal of sparsely-doped pseudo-β-titanium alloy Ti–2.8Al–5.1Mo–4.9Fe produced by ESM method, using three types of heat treatment: annealing, quenching with aging and delayed cooling, was assessed. It is found that by the results of heat treatment in the form of annealing, quenching with aging or delayed cooling the structure of metal of Ti–2.8Al–5.1Mo–4.9Fe alloy becomes homogeneous, (α+β)-structure prevails, and β-phase content decreases to the level of 49…61 %. Water quenching and subsequent aging forms in the metal of Ti–2.8Al–5.1Mo– 4.9Fe titanium alloy the most dispersed and homogeneous intragranular microstructure with α-particle dimensions of 1…3 μm with the highest values of strength on the level of 1187 MPa and impact toughness of 3.7 J/cm2. Delayed cooling at the controlled rate of 1 °C/min leads to lowering of the strength of Ti–2.8Al–5.1Mo–4.9Fe alloy. Annealing without controlled cooling or transferring to the quenching medium is the simplest heat treatment for Ti–2.8Al–5.1Mo–4.9Fe alloy, which ensures a homogeneous structure, β-phase content in the metal on the level of 54 % and impact toughness values of 5.6...7.1 J/cm2. Ref. 16, Tabl. 4, Fig. 6.
Keywords: titanium; titanium sparsely-doped and pseudo-β-alloys; heat treatment; annealing; quenching; aging; microstructure; mechanical properties

Received 06.03.2021

References

1. Lütjering G., Williams J.C. (2003) Titanium. Berlin, Springer-Verlag. https://doi.org/10.1007/978-3-540-71398-2
2. (2002) Opportunities for low cost titanium in reduced fuel consumption, improve demissions, 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) 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) Low-cost titanium alloys and possibilities of their application. In: Proc. of Int. Conf. on Ti-2007 in CIS, Kiev, IMP, 191-192 [in Russian].
6. Dobrescu, M., Dimitriu, S., Vasilescu, M. (2011) Studies on Ti-Al-Fe low-cost titanium alloys manufacturing, processing and applications. Metalurgia Int., 16(4), 73.
7. Lin, D.J., Ju, C.P., Lin, J.H.C. (1999) Structure and properties of cast Ti-Fe alloys. Transact. of the American Foundry men`s Society, 107, 859-864.
8. Holden, F.C., Ogden, H.R., Jaffee, R.I. (1956) Heat treatment and mechanical properties of Ti-Fe alloys. Transact. of the American Institute of Mining and Metallurgical Engineers, 206(5), 521-528.
9. Lee, D.B., Park, K.B., Jeong, H.W., Kim, S.E. (2002) Mechanical and oxidation properties of Ti-xFe-ySi alloys. Mater. Sci. and Engin. A., 328(1/2), 161-168. https://doi.org/10.1016/S0921-5093(01)01670-7
10. Murray, J.L. (1987) Phase diagrams of binary titanium alloys. ASM Int., Ohio, USA.
11. Bokshtejn, S.Z., Kishkin, S.T., Mirsky, L.M. (1971) Influence on thin structure, formed in titanium during polymorphous (α+β)-transformation, on diffusion mobility. Izv. AN SSSR. Metally, 5, 210-215 [in Russian].
12. 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), 346. https://doi.org/10.1007/s12598-009-0068-5
13. Akhonin, S.V., Pikulin, A.N., Berezos, V.A. et al. (2019) Laboratory electron beam unit UE-208M. Sovrem. electrometall., 3 , 15-22 [in Russian]. https://doi.org/10.15407/sem2019.03.03
14. 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/as2018.07.02
15. 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
16. Akhonin, S.V., Belous, V.Yu., Selin, R.V. et al. (2019) EBW and local heat treatment of sparcely-doped titanium alloys based of β-phase. In: Proc. of 9th Int. Conf. on Beam Technologies in Welding and Processing of Materials (Odessa, Ukraine, 9-13 September 2019). IAW, 12-15.

Advertising in this issue: