OBRABOTKAMETALLOV Vol. 27 No. 2 2025 54 TECHNOLOGY References 1. ZhaoQ., SunQ., Xin S., ChenY.,WuC.,WangH., Xu J.,WanM., ZengW., ZhaoY. High-strength titaniumalloys for aerospace engineering applications: a review on melting-forging process. Materials Science and Engineering: A, 2022, vol. 845, p. 143260. DOI: 10.1016/j.msea.2022.143260. 2. Marin E., Lanzutti A. Biomedical applications of titanium alloys: a comprehensive review. Materials (Basel), 2024, vol. 17 (2), p. 114. DOI: 10.3390/ma17010114. Microstructure and mechanical properties of Ti2AlNb-based alloy weld joints as a function of gas tungsten arc welding parameters Stanislav Naumov 1, a,*, Dmitrii Panov 1, b, Vitaly Sokolovsky 1, c, Ruslan Chernichenko 1, d, Gennady Salishchev 1, e, Dmitry Belinin 2, f, Vasilii Lukianov 3, g 1 Belgorod National Research University, 85 Pobedy Str., Belgorod, 308015, Russian Federation 2 Perm National Research Polytechnic University, 29 Komsomolskiy Prosp., Perm, 614990, Russian Federation 3 NPA “Technopark AT”, 5 Tramvaynaya Str. (bld. 1), Ufa, 450027, Russian Federation a https://orcid.org/0000-0002-4084-8861, NaumovStanislav@yandex.ru; b https://orcid.org/0000-0002-8971-1268, dimmak-panov@mail.ru; c https://orcid.org/0000-0001-5607-2765, sokolovskiy@bsuedu.ru; d https://orcid.org/0000-0002-8619-0700, rus.chernichenko@mail.ru; e https://orcid.org/0000-0002-0815-3525, salishchev_g@bsuedu.ru; f https://orcid.org/0000-0001-5462-0908, 5ly87@mail.ru; g https://orcid.org/0009-0006-3621-3966, lukianovv@bk.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2025 vol. 27 no. 2 pp. 43–56 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2025-27.2-43-56 ART I CLE I NFO Article history: Received: 12 February 2025 Revised: 01 March 2025 Accepted: 21 March 2025 Available online: 15 June 2025 Keywords: Gas tungsten arc welding (GTAW, TIG) Ti2AlNb Ti–Al–Nb–(Zr, Mo)–Si Scanning electron microscopy (SEM) Mechanical properties Funding Thisworkwas supported by theRussian Science Foundation (Agreement No. 19-79-30066) using the equipment of BSU Shared Research Facilities “Technologies and Materials”. ABSTRACT Introduction. Gas tungsten arc welding (GTAW), also known as tungsten inert gas (TIG) welding, is a promising welding method for Ti2AlNb-based alloys, including Ti–Al–Nb–(Zr, Mo)–Si alloy, due to its accessibility and relative simplicity, making it attractive for aerospace applications. However, the application of GTAW to Ti–Al–Nb–(Zr, Mo)– Si alloy is limited by the formation of a coarse-grained microstructure in the weld, leading to reduced mechanical properties of weld joints. Purpose of the work. This study investigates the infl uence of GTAW modes (using direct current with low- and high-frequency pulses) on the microstructure and tensile properties of Al–Nb–(Zr, Mo)–Si alloy weld joints. Methods. GTAW of plates was carried out using welding currents ranging from 80 to 150 A, employing both low- and high-frequency (>100 Hz) pulses. The microstructure of the weld joints was examined using scanning electron microscopy (SEM). The tensile properties were evaluated through uniaxial tensile testing of the welded joints. The shielding gas fl ow rate was 12 L/min, while a separate gas fl ow of 2 L/min was used for blowing. The microstructure of the weld joints was examined using scanning electron microscopy (BSE-EBSD analysis). The tensile properties were evaluated through uniaxial tensile testing of the weld joints. Results and discussion. The weld joints microstructure is characterized by elongated, coarse dendrites in the central and weld bead regions and globular β-grains in the root part of the fusion zone. Tensile testing of the weld joints revealed a strength level approximately 90% of that of the base metal when using pulse mode (σu = 1100 MPa, δ = 1.1 %, 335–390 HV0.2) and not less than 80% when using direct current modes. This level of mechanical properties is achieved using highfrequency pulsed welding, where the maximum length and width of dendrites in the weld joint are 1.06 mm and 0.33 mm, respectively, and the average size of globular grains in the lower part of the weld joint is approximately 130 μm, which is less than that observed when utilizing the same modes, but direct current. For citation: Naumov S.V., Panov D.O., Sokolovsky V.S., Chernichenko R.S., Salishchev G.A., Belinin D.S., Lukianov V.V. Microstructure and mechanical properties ofTi2AlNb-based alloyweld joints as a function of gas tungsten arcwelding parameters. Obrabotkametallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2025, vol. 27, no. 2, pp. 43–56. DOI:10.17212/1994-6309-2025-27.243-56. (In Russian). ______ * Corresponding author Naumov Stanislav V., Ph.D. (Engineering), Belgorod National Research University, 85 Pobedy Str., 308015, Belgorod, Russian Federation Tel.: +7 912 580-55-68, e-mail: NaumovStanislav@yandex.ru
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