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- Title
Additive Manufacturing of Titanium Aluminide Alloy Ti–Al–V–Nb–Cr–Gd by Selective Electron Beam Melting.
- Authors
Panin, P. V.; Lukina, E. A.; Bogachev, I. A.; Medvedev, P. N.; Naprienko, S. A.
- Abstract
We have studied the technological properties, chemical composition, and structure of a metal powder composition (MPC, 40–100 μm) made from a new six-component intermetallic β-solidifying TiAl-alloy Ti–44.5Al–2V–1Nb–2Cr–0.1Gd, at. % (Ti–31.0Al–2.5V–2.5Nb–2.5Cr–0.4Gd, wt.%) by crucibleless induction melting inert gas atomization and intended for additive manufacturing of dense parts by selective electron beam melting (SEBM). It is shown that the main elements of the composition of the MPC are the same as in the electrode, and the phase composition of the MPC corresponds to a rapidly solidified metastable state (γ + α + β). High flowability and sphericity of the MPC were achieved. The Al content in the starting electrode reduces by 1.1–1.3 at.% (1.0–1.2 wt.%) after SEBM due to evaporation. The microstructure of the as-SEBM-built testpieces exhibited intragranular lamellar (γ + α2)-colonies and some γ- and β0/B2-phases at grain boundaries. It was found out that the cross-sectional distribution of Ti and Al along the building direction (Z) is nonuniform, resulting in nonuniform distribution of phases and grain sizes. No areas with duplex or coarse-grained γ-phase, which are characteristic for the 2nd-generation electron beam melted TiAl-alloy Ti-4822, were identified.
- Subjects
ELECTRON beam furnaces; TITANIUM alloys; METAL powders; PARTICLE size distribution; METASTABLE states; TITANIUM powder; ELECTRON beams
- Publication
Metallurgist, 2023, Vol 67, Issue 3/4, p324
- ISSN
0026-0894
- Publication type
Article
- DOI
10.1007/s11015-023-01519-y