DOI: 10.52150/2522-9117-2024-38-501-516

Adjamskiy Serhii Viktorovych, Ph. D., Chief Designer, Senior Researcher, LLC “Additive laser technology of Ukraine”, Serhiy Podolynskyi St., 31 b, Dnipro, Ukraine.
Institute of Transport Systems and Technologies of the National Academy of Sciences of Ukraine, Pysarzhevskoho St., 5, Dnipro, 49000, Ukraine.
ORCID: 0000-0002-6095-8646. E-mail: as@alt-print.com

Podolsky Rostyslav Viacheslavovych, Ph. D., Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine.
LLC “Additive laser technology of Ukraine”, Serhiy Podolynskyi St., 31 b, Dnipro, Ukraine.
ORCID: 0000-0002-0288-0641. E-mail: rostislavpodolskij@gmail.com

Kononenko Ganna Andriivna, D. Sc. (Tech.), Senior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine.
LLC “Additive laser technology of Ukraine”, Serhiy Podolynskyi St., 31 b, Dnipro, Ukraine.
National Technical University “Dnipro Polytechnic”, Dmytra Yavornytskoho Ave., 19, Dnipro, 49005, Ukraine
ORCID: 0000-0001-7446-4105. E-mail: perlit@ua.fm

Klemeshov Evhen Serhiiovych, Ph. D. (Tech.), Researcher, Processes and Machines for Metal Forming Department, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0001-6486-5319. Email: klemeshov.evgen@gmail.com

Safronova Olena Anatoliivna, Junior Researcher, Ph. D. Student, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0002-4032-4275. E-mail: safronovaaa77@gmail.com

DEVELOPMENT OF RATIONAL HEAT TREATMENT REGIMES TO REDUCE RESIDUAL STRESSES IN PARTS OF COMPLEX CROSS-SECTION MADE OF 316L STEEL USING SLM TECHNOLOGY

Abstract. Residual internal stresses are one of the features of metallic materials manufactured by layer-by-layer fusion using SLM technology, but they can significantly affect mechanical properties and geometric parameters, therefore, it is necessary to take measures to reduce residual stresses. According to the results of analytical studies, it was found that the most effective way to reduce residual stresses is heat treatment. Purpose of the study. To investigate the influence of heat treatment under different regimes on the change in internal stresses of the first kind using calculations and direct measurements as a deviation of the actual geometric parameters from the specified dimensions of a part of a complex shape manufactured using SLM technology from AISI 316L steel. Research idea. Known studies of the influence of internal stresses depending on the geometry of the part were mainly carried out on elements of a simple shape. The authors developed a model of a product with a complex cross-section, which allows assessing the influence of the wall thickness and the type of transition from a smaller to a larger cross-section. Material and research methodology. A complex-shaped part was manufactured from 316L steel powder using SLM technology according to the developed model. Using the QForm and JmatPRO programs, the deviations in the geometry of the part that arise under the influence of residual stresses after heat treatment using experimental modes (heating to 899°C, holding for 1 hour, cooling in water; heating to 650°C, 2 hours, water; heating to 550°C, 4 hours, water) were calculated and the actual geometry deviations on the product were monitored using a 3-D scanner and Geomagic ControlX software. Based on the results obtained, recommendations were given for heat treatment that will ensure effective reduction of residual stresses and preservation of the initial structure formed during manufacturing using SLM technology.

Key words: homogeneous thick sheet steel, hardness, strength, impact strength, bainite ferrite, heat treatment.

DOI: https://doi.org/10.52150/2522-9117-2024-38-501-516

For citation: Adjamskiy, S. V., Podolskyi, R. V., Kononenko, G. A., Klemeshov, E. S., & Safronova, O. A. (2024). Development of rational heat treatment regimes to reduce residual stresses in parts of complex cross-section made of 316L steel using SLM technology. Fundamental and applied problems of ferrous metallurgy, 38, 501-516. https://doi.org/10.52150/2522-9117-2024-38-501-516

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