The Paton Welding Journal, 2023, №08



2023 №08 (06)

DOI of Article 10.37434/tpwj2023.08.07

2023 №08 (08)

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The Paton Welding Journal, 2023, #8, 56-59 pages

Influence of a stop in the process of melting on mechanical properties of specimens from the Co‒Cr‒Mo alloy made by SLM technology

S.V. Adzhamskyi², G.A. Kononenko¹, R.V. Podolskyi³

¹LLC “Additive Laser Technologies of Ukraine”, 31 v Serhiy Podolynskyi Str., 49000, Dnipro, Ukraine
²Institute of Transport Systems and Technologies of NASU, 5 Pisarzhevsky Str., 49000, Dnipro, Ukraine
³Iron and Steel Institute of Z.I. Nekrasov of NASU, Akademik Starodubov Sq., 49000, Dnipro, Ukraine
⁴Ukrainian State University of Science and Technologies, 4 Haharina Prosp., 49000, Dnipro, Ukraine

Abstract
In the modern manufacturing of parts of metal powder, the method of Selective Laser Melting (SLM) has become widespread. In Ukraine, the LLC “Additive Laser Technologies of Ukraine” is engaged in the development of equipment for manufacturing parts of metal powders by SLM technology. Nowadays, for this equipment, the relevant task is the development of a procedure for choosing the parameters of the process of melting metal powder, providing the necessary mechanical and service properties of parts. For the investigations, three experimental cylindrical specimens of Co‒Cr‒Mo alloy were made in the vertical direction for tensile test according to ISO 6892:2019 – with a diameter of the working zone of 5 mm, with a controlled stop at a height of 18 mm from the beginning of the working zone, the total length of which is 28 mm. As a result of the analysis of the values of mechanical properties, it was found that the ultimate strength of the experimental specimens of Co‒Cr‒Mo alloy made by SLM technology with a controlled stop during 24 h decreases compared to the specimens made without a controlled stop — by ~13 %, relative elongation – by ~1 % and reduction in area – by ~17 %. It was found that for the experimental specimens with a stop in the manufacturing process, the deviation from the average values was: for ultimate strength ~11 %, relative elongation ~62 % and reduction in area of ~21 %. This is predetermined by failure of one of the specimens at the place of a stop. The use of parts with a production defect (stop) should be significantly restricted respective to a probable significant softening and embrittlement of a product. 17 Ref., 1 Tabl., 4 Fig.
Keywords: selective laser melting, controlled stop, Co‒Cr‒Mo alloy, mechanical properties, density

Received: 16.06.2023
Accepted: 07.08.2023

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