Defect Formation in Titanium Alloy during Non-stationary Process of Local Metallurgy

• Published in: Russian physics journal Vol. 63; no. 6; pp. 962 - 967
• Main Authors: Kalashnikov, K. N., Chumaevskii, A. V., Kalashnikova, T. A., Osipovich, K. S., Kolubaev, E. A.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.10.2020; Springer Nature B.V
• Subjects: Beta phase; Columnar structure; Condensed Matter Physics; Electron beams; Hadrons; Heavy Ions; Lasers; Mathematical and Computational Physics; Metallurgical analysis; Microhardness; Nuclear Physics; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; Stationary processes; Tensile strength; Theoretical; Three dimensional printing; Titanium alloys; Titanium base alloys; Ultimate tensile strength; Wire; titanium alloy; additive manufacturing technology; microstructure; mechanical properties
• ISSN: 1064-8887; 1573-9228
• DOI: 10.1007/s11182-020-02124-1

The paper studies Ti-6Al-4V alloy specimens obtained by wire-based electron-beam additive manufacturing (EBAM) and characterized by the structure with a defective region produced by uncontrolled wire fluctuations during 3D printing. Metallographic analysis and tensile strength tests and microhardness measurements are conducted to determine the defect influence on the structure and properties of the alloy. It is shown that the defective region represents the primary β-phase grains that are finer than those of the EBAM specimens commonly exhibiting a columnar structure. The specimen microhardness both in the defective and defect-free regions, is identical. The deformation behavior of the alloy is mostly subject to the influence of such defects, since the plasticity and ultimate tensile strength of the defective region are respectively higher and lower than that of the defect-free region.