Automatic Welding, 2025, №01

2025 №01 (01)

DOI of Article 10.37434/as2025.01.02

2025 №01 (03)

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"Avtomatychne Zvaryuvannya" (Automatic Welding), #1, 2024, pp. 8-12

Study of the influence of roughness on the mechanical properties of stainless steel samples made by LPBF-technology

S.V. Adjamskiy^1,2, G.A. Kononenko^1,3,4, R.V. Podolskyi^1,3, O.A. Safronova³

¹LLC «Additive Laser Technology of Ukraine». 49000, 31 v Serhiy Podolynskyi Str., Dnipro, Ukraine. E-mail: as@alt-print.com
²Institute of Transport Systems and Technologies of the NAS of Ukraine. 49000, 5 Pysarzhevsky Str., Dnipro, Ukraine
³Z.I. Nekrasov Iron and Steel Institute of the NAS of Ukraine. 1 Acad. Starodubov Sq., 49000, Dnipro, Ukraine
⁴Dnipro University of Technology. 19 D. Yavornytskyi Ave., 49005, Dnipro, Ukraine

In the modern additive manufacturing of parts, the LPBF method has become widespread, which implies the technology of laser melting of a metal powder layer, that significantly expands the possibilities for optimizing the geometry of products. For parts manufactured using the traditional method (casting, deformation), it is known that the surface roughness can significantly affect the level of mechanical properties, since protrusions and depressions are stress concentrators. Parts manufactured using additive manufacturing technologies have an increased roughness, but their structural state after manufacturing is significantly different from traditional metal. It is often necessary to operate without subsequent mechanical surface treatment of products manufactured by the LPBF method. In the work the effect of roughness, the presence or absence of mechanical treatment of the working area of the samples on the mechanical properties under static tension conditions was determined. From the analysis of the profilometric curve and microstructure, it was found that the samples without mechanical treatment have periodic protrusions, which is related to the texture formed during the manufacture. The average values of the mechanical properties do not differ significantly (less than 6.6 % for various characteristics) depending on the presence or absence of mechanical treatment, but deviations from the average within the sample regarding the values of tensile strength and reduction in area for samples without mechanical treatment are many times larger compared to the interval of value fluctuations within the sample for samples with mechanical treatment. 16 Ref., 2 Tabl., 4 Fig.
Keywords: LPBF – technology, roughness, stainless steel, mechanical properties


Received: 31.10.2024
Received in revised form: 19.11.2024
Accepted: 03.02.202

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