Electrometallurgy Today, 2022, №02



2022 №02 (05)

DOI of Article 10.37434/sem2022.02.06

2022 №02 (07)

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Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2022, #2, 39-49 pages

Structure and properties of sparsely-alloyed Ti–2.8Al–5.1Mo–4.9Fe

V.A. Kostin, O.M. Berdnikova, S.G. Hrygorenko, T.G. Taranova, O.S. Kushnareva, V.V. Zhukov

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
Experimental sparsely-alloyed Ti–2.8Al–5.1Mo–4.9Fe and Ti–1.5Fe–0.4O titanium alloys, produced by cold-hearth electron beam melting, were studied. Metallographic, structural, X-ray structural and transmission electron microscopy studies were conducted, thermokinetic diagrams of titanium alloy transformation were plotted, and critical cooling rates were determined, physical and computer modeling of phase transformations in the studied titanium alloys was performed. It was found that sparsely-alloyed Ti–2.8Al–5.1Mo–4.9Fe titanium alloy is a two-phase pseudo-β-alloy, and Ti–1.5Fe–0.4O alloy is a two-phase pseudo-α-alloy. It was established that in Ti–2.8Al–5.1Mo–4.9Fe alloy hardening occurs due to formation of dispersed particles of Mо9Ti4 and Fe2Ti titanium intermetallics, and in Ti–1.5Fe–0.4O alloy it is ensured by dispersion-strengthening particles of Ti3O5, Ti4Fe2O and FeTiO titanium oxides. Sparsely-alloyed Ti–2.8Al–5.1Mo–4.9Fe titanium alloy has higher strength values, compared to these values of Ti–1.5Fe–0.4O alloy, but lower ductility and impact toughness values. Critical cooling rate for the experimental Ti–2.8Al–5.1Mo–4.9Fe titanium alloy is equal to 20 °С/s. Ref. 32, Tabl. 4, Fig. 9. Key words: sparsely-alloyed titanium alloys; electron beam melting; microstructure; titanium alpha- and beta-phases; dispersion-strengthening particles; titanium oxides; intermetallics; structural transformations; Gleeble 3800; modeling

Received 07.04.2022

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