Automatic Welding, 2020, №05



2020 №05 (04)

DOI of Article 10.37434/as2020.05.05

2020 №05 (06)

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Avtomaticheskaya Svarka (Automatic Welding), #5, 2020, pp. 31-36

Microstructure of titanium alloys produced by the method of layered electron beam surfacing using the wire of grade Ti6AI4V

V.M. Nesterenkov, M.O. Rusynyk, O.M. Berdnikova, V.A. Matviychuk, V.R. Strashko

E.O. Paton Electric Welding Institute of NAS of Ukraine, 11 Kazymyr Malevich Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Using electron beam surfacing, the specimens of products of titanium alloy of various shapes using the wire of grade Ti6Al4V were produced. In the deposited layers no defects were detected. In the course of the work, the investigations of microstructure, phase composition and mechanical properties of the specimens were carried out. For the weld metal, the structure consisting mainly of lamellar-acicular ɑ'-phase is typical. The structure contains a small amount of β-phase, which lies in the form of thin layers between the acicular precipitations of ɑ'-phase. It is not detected using the optical microscope, however can be detected applying electron microscopy and X-ray examinations. The microstructure of the deposited metal is mostly equilibrium and granular, gradient in sizes and microhardness. The microhardness of the boundary zones diff ers from the microhardness of the grain matrix, which may be associated with the diff erence in the content of alloying elements. Towards the top of the built specimen, the hardness decreases slightly. 8 Ref., 1 Tabl., 9 Fig.
Keywords: additive technologies, electron beam gun, electron beam surfacing, titanium alloy, metallography, microstructure, microhardness

Received: 02.04.2020

References

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