OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 3 2024 Fig. 3. Scanning strategy II (∠ 45) With scanning strategy III (∠ 90S/2), the specimen is formed when the direction of the laser movement changes by 90° every odd layer (n, n + 2, etc.). In every even layer (n + 1, n + 3), the direction of the laser beam is parallel to the previous layer, and the track is shifted by a distance of S/2. The strategy is shown in Figure 4. Fig. 4. Scanning strategy III (∠ 90S/2) Scanning strategy IV (∠ 90p.p.), in which each layer is scanned by the laser beam twice (double remelting) and during the second pass the step is shifted by S/2 while the direction of the laser movement changes by 90° from layer to layer. This scheme is shown in Figure 5. Fig. 5. Scanning strategy ⅠV (∠ 90 p.p.) Results and discussion The photographs of the structure of the specimens formed with the use of different scanning strategies from the composition of powders under the following SLM modes [22]: P = 90 W; v = 225 mm/s; S = 0.08 mm; h = 0.025 mm; t = 25 С°, are presented in Table 1.
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