Microstructure and Phase Composition of VT1-0, VT6, and VT14 Titanium Alloys Produced by Wire-Feed Electron-Beam Additive Manufacturing

Using optical, scanning- and transmission-electron microscopy, and also electron backscatter diffraction, we demonstrate that the microstructure of samples of commercially pure titanium VT1-0 and titanium alloys VT6 and VT14, obtained by the wire-feed electron-beam additive method, consists of colum...

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Bibliographic Details
Published in:Surface investigation, x-ray, synchrotron and neutron techniques x-ray, synchrotron and neutron techniques, 2022-12, Vol.16 (6), p.983-991
Main Authors: Panin, A. V., Kazachenok, M. S., Kazantseva, L. A., Martynov, S. A., Panina, A. A., Lobova, T. A.
Format: Article
Language:English
Subjects:
Alloying effects
Alloying elements
Aluminum
Atomic structure
Beta phase
Chemistry and Materials Science
Electron backscatter diffraction
Electron beams
Electronic structure
Lattice parameters
Martensite
Materials Science
Microstructure
Phase composition
Residual stress
Surfaces and Interfaces
Thin Films
Titanium alloys
Titanium base alloys
Wire
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Summary:Using optical, scanning- and transmission-electron microscopy, and also electron backscatter diffraction, we demonstrate that the microstructure of samples of commercially pure titanium VT1-0 and titanium alloys VT6 and VT14, obtained by the wire-feed electron-beam additive method, consists of columnar primary grains of the β phase of titanium containing crystals of packet and lamellar martensite phases. Х-ray diffraction phase analysis shows that the concentration of the residual β phase in the VT6 and VT14 samples is 2.9 and 10.5%, respectively. The concentration of alloying elements in the α and β phases of titanium alloys is measured by energy-dispersive analysis. The effect of alloying elements on the lattice parameters of the α phase of the samples is demonstrated. The different concentration of the residual β phase in titanium alloys VT6 and VT14 can be explained by considering the electronic structure of atoms of alloying elements. Tensile residual stress is present in samples VT1-0, while the residual stress in samples VT6 and VT14 is compressive. The presence of aluminum in the titanium alloys affects the sign and magnitude of the residual stress in titanium-alloy samples.
ISSN:1027-4510
1819-7094
DOI:10.1134/S1027451022060180