OBRABOTKAMETALLOV Vol. 26 No. 2 2024 68 TECHNOLOGY The eff ect of laser surfacing modes on the geometrical characteristics of the single laser tracks Svetlana Dolgova 1, a, Alexandr Malikov 2, b, Alexander Golyshev 2, c , Aelita Nikulina 3, d, * 1 Novosibirsk semiconductor device plant Vostok, 60 Dachnaya st., Novosibirsk, 630082, Russian Federation 2 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, 4/1 Institutskaya str., Novosibirsk, 630090, Russian Federation 3 Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation a https://orcid.org/0000-0003-3918-273X, svetlanadolgova99@gmail.com; b https://orcid.org/0000-0003-1268-8546, smalik707@yandex.ru; c https://orcid.org/0000-0002-4243-0602, alexgol@itam.nsc.ru; d https://orcid.org/0000-0001-9249-2273, a.nikulina@corp.nstu.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. 2024 vol. 26 no. 2 pp. 57–70 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2024-26.2-57-70 ART I CLE I NFO Article history: Received: 15 March 2024 Revised: 13 April 2024 Accepted: 17 April 2024 Available online: 15 June 2024 Keywords: Additive technologies, Fiber laser, Single tracks, Optimization, Macrostructure, Austenitic steel 316L Funding The work was carried out within the framework of the state assignment of the ITAM SB RAS. ABSTRACT Introduction. Laser surfacing is one of the leading trends in the fi eld of additive technologies, which consists in layer-by-layer build of material using a laser as an energy source. To obtain a high-quality product, it is necessary to select the optimal building parameters correctly. The problem is that such optimization is necessary for all equipment, since minor diff erences in its characteristics can make signifi cant changes in the parameters of layerby-layer build. In order to determine the optimal build mode, it is enough to analyze the eff ect of various equipment parameters on the characteristics of single tracks. Therefore, the purpose of this work is to determine the most important parameters of laser radiation that aff ect the surfacing process and the optimal mode for building a single track of chromium-nickel steel. The work investigated single tracks obtained by laser surfacing of powder from austenitic chromium-nickel steel AISI 316L. The optimization factors included such characteristics as laser power, beam speed, fl ow rate of supplied powder and laser spot size. The wavelength of laser radiation was 1.07 μm. Research methods. To determine the quality and geometric dimensions of single tracks, the macrostructure of cross sections of specimens was studied using metallography and scanning electron microscopy methods. Results and discussion. It is established that the optimal mode for growing single tracks of steel AISI 316L is characterized by a laser radiation power of 1,250 W and a scanning speed of 25 mm/s. In this case, the optimal powder consumption rate is 12 g/min, and the laser spot size is 4.1 mm. The work shows that the powder consumption and laser spot size have the greatest infl uence on the coeffi cient of eff ective use of powder material. By changing it, the surfacing performance can be increased by 10–15 %. For citation: Dolgova S.V., MalikovA.G., GolyshevA.A., Nikulina A.A. The eff ect of laser surfacing modes on the geometrical characteristics of the single laser tracks. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2024, vol. 26, no. 2, pp. 57–70. DOI: 10.17212/1994-6309-2024-26.2-57-70. (In Russian). ______ * Corresponding author Nikulina Aelita A., D.Sc. (Engineering), Professor Novosibirsk State Technical University, 20 Prospekt K. Marksa, 630073, Novosibirsk, Russian Federation Tel.: +7 (383) 346-11-71, e-mail: a.nikulina@corp.nstu.ru References 1. Gadagi B., Lekurwale R. A review on advances in 3D metal printing. Materials Today: Proceedings, 2021, vol. 45, pp. 277–283. DOI: 10.1016/j.matpr.2020.10.436. 2. Svetlizky D., Das M., Zheng B., Vyatskikh A.L., Bose S., Bandyopadhyay A., Schoenung J.M., Lavernia E.J., Eliaz N. Directed energy deposition (DED) additive manufacturing: Physical characteristics, defects, challenges and applications. Materials Today, 2021, vol. 49, pp. 271–295. DOI: 10.1016/j.mattod.2021.03.020. 3. Saeidi K., Gao X., Zhong Y., Shen Z.J. Hardened austenite steel with columnar sub-grain structure formed by laser melting. Materials Science and Engineering: A, 2015, vol. 625, pp. 221–229. DOI: 10.1016/j. msea.2014.12.018.
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