OBRABOTKAMETALLOV technology Vol. 26 No. 2 2024 Fig. 11. Effect of power changes on the coefficient of useful material consumption: beam diameter 2.9 mm, powder flow rate 24 g/min Fig. 12. Effect of changes in powder consumption on the coefficient of useful material consumption; power 1.250 W, speed 25 mm/s, beam diameter 2.9 mm Fig. 13. Influence of the laser beam diameter on the coefficient of useful material consumption; power 1.250 W, speed 25 mm/s, powder flow rate 12 g/min Conclusion The effect of deposition parameters on the geometric dimensions of single tracks from austenitic steel 316L using a fiber laser is investigated in this work. During the study, it was confirmed that with increasing scanning speed and laser power there is a decrease in the height of a single track with an increase in its width. Based on the analysis of geometrical dimensions, wetting angle with the substrate, presence of pores and cracks in the zone of connection between the obtained single tracks and the substrate, the optimal growth mode is determined, laser power and scanning speed for which were 1,250 W and 25 mm/s, respectively. When the laser power increases, active sparking occurs, which is accompanied by an increase in the penetration depth and an increase in surface roughness. Changing the parameters of powder flow rate and laser beam diameter results in single tracks characterized by lower roughness and complete wetting of the surface. The optimal powder flow rate is noted at a disk rotation speed of 4 % (respectively, the powder flow rate is 12 g/min). The beam diameter, at which the characteristics of single tracks are optimal, is 4.1 mm. The productivity of direct laser deposition in this work was about 20–23 %. It is found that such characteristics as powder flow rate and laser beam diameter have the greatest influence on the coefficient of effective materials consumption. Changing these parameters allows increasing the productivity by 10–15 %. 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.
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