OBRABOTKAMETALLOV Vol. 24 No. 4 2022 62 TECHNOLOGY References 1. Paranthaman V., Dhinakaran V., Swapna Sai M., Devaraju A. A systematic review of fatigue behaviour of laser welding titanium alloys. Materials Today: Proceedings, 2021, vol. 19, pt. 1, pp. 520–523. DOI: 10.1016/j. matpr.2020.08.249. 2. Ren D., Jiang Y., Hu X., Zhang X., Xiang X., Huang K., Ling H. Investigation of tensile and high cycle fatigue failure behavior on a TIG welded titanium alloy. Intermetallics, 2021, vol. 132, p. 107115. DOI: 10.1016/j. intermet.2021.107115. Formation features of a welding joint of alloy Ti-5Al-3Mo-1V by the friction stir welding using heat-resistant tool from ZhS6 alloy Alihan Amirov а, Evgeniy Moskvichev b, Aleksey Ivanov c, Andrey Chumaevskii d, Vladimir Beloborodov e Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, 2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation а https://orcid.org/0000-0002-5143-8235, amirov@ispms.tsc.ru, b https://orcid.org/0000-0002-9139-0846, em_tsu@mail.ru, c https://orcid.org/0000-0001-8959-8499, ivan@ispms.tsc.ru, d https://orcid.org/0000-0002-1983-4385, tch7av@gmail.com, e https://orcid.org/0000-0003-4609-1617, vabel@ispms.tsc.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. 2022 vol. 24 no. 4 pp. 53–63 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2022-24.4-53-63 ART I CLE I NFO Article history: Received: 15 September 2022 Revised: 29 September 2022 Accepted: 03 November 2022 Available online: 15 December 2022 Keywords: Friction stir welding Titanium alloy Ti-5Al-3Mo-1V Microstructure Welding tool Tool wear Fractography Funding The work was performed under Russian science foundation grant No. 22-29-01621. Acknowledgements The investigations were carried out using the equipment of Share Use Centre “Nanotech” of the ISPMS SB RAS. Research were partially conducted at core facility “Structure, mechanical and physical properties of materials”. ABSTRACT Introduction. The technological process of fabrication products from titanium alloys is often complicated by low quality of welded joints during electric arc or gas-fl ame welding operations due to high residual stresses and deformations. An example of a successful solution to this problem is the development and implementation of such high-tech processes of metal joining as friction stir welding, which does not refer to the methods of fusion joining. Friction stir welding as an advanced technology is used to obtain joints of “soft” metallic materials, such as aluminum. For “hard” metallic materials, friction stir welding has been limited due to the high demands on welding tools. The aim of this work is investigation of the possibility of using a tool made of the nickel-based heat-resistant alloy ZhS6U in friction stir welding of the titanium alloy Ti5Al-3Mo-1V. Results and discussion. Optical and scanning electron microscopy results revealed that the structure of the weld is typical of this type of welding, gradient, consisting of a heat-affected zone, thermomechanical affected zone and a stir zone with a fragmented structure. When varying welding parameters, it is shown that the defectiveness of the weld is affected to a greater extent by the axial load on the tool, which is caused by a signifi cant difference in the thermal effect on the material. Metallographic analysis methods revealed dissolution of welding tool material fragments in the stir zone of the non-detachable joint. Fractographic analysis of the fracture surface shows that the fracture in the weld zone is ductile, although in this case there are brittle bridges. Varying the parameters of friction stir welding made it possible to obtain an indissoluble joint with at least 90 % of the strength of the base metal. For citation: Amirov A.I., Moskvichev E.N., Ivanov A.N., Chumaevskii A.V, Beloborodov V.A. Formation features of a welding joint of alloy Ti-5Al-3Mo-1V by the friction stir welding using heat-resistant tool from ZhS6 alloy. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2022, vol. 24, no. 4, pp. 53–63. DOI: 10.17212/1994-6309-2022-24.4-53-63. (In Russian). ______ * Corresponding author Amirov Alihan I., Junior researcher Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences 2/4, pr. Akademicheskii 634055, Tomsk, Russian Federation Tel.: 8 (382) 249-11-60, e-mail: amirov@ispms.ru
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