OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 27 No. 3 2025 a b Fig. 1. Particles of Inconel 625 (a) and AISI 316L (b) powders Ta b l e 1 Chemical composition of the materials Material Chemical element, wt.% Fe Ni Cr C Mo Nb Ti S P 316L bal. 8.84 18.69 0.03 2.50 - 0.71 0.013 0.015 Inconel 625 3.8 bal. 19.16 0.1 8.1 3.36 0.28 0.011 0.01 0.12 C-18 Cr-10 Ni-Ti bal. 7.852 18.16 0.027 – – 0.002 0.002 0.027 Ta b l e 2 Deposition parameters for specimens Mode Power, W Speed, mm/s Consumption, g/ min Beam diameter, mm 1 1,000 35 12 4,1 2 1,250 25 3 1,500 15 Structural studies Structural characterization was performed using an optical microscope Carl Zeiss A1Z and a scanning electron microscope (SEM) Carl Zeiss EVO 50 XVP. Sample preparation followed standard metallographic procedures, including grinding and polishing steps. To reveal the microstructure of the joints, electrolytic etching was carried out in a 10 % aqueous solution of oxalic acid. The chemical composition in the joint zones between dissimilar materials was analyzed using energydispersive X-ray spectroscopy (EDS) with an INCA X-Act detector attached to the SEM. Phase composition analysis was conducted on an ARL X’TRA X-ray diffractometer equipped with a Mo Kα1/α2 radiation source (λ = 0.7093 Å), using a step size of Δ2θ = 0.03° and an acquisition time of 5 s per point. Microhardness testing was carried out using a Wolpert Group 402 MVD Vickers hardness tester under a load of 100 g with a dwell time of 10 s applied to a diamond indenter. Results and Discussion An example of the fabricated hybrid structure is shown in Fig. 2. During deposition, a uniform wall was formed without visible surface cracks. The height of the built structures reached 7 mm for processing
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