Fig. 1. Principle of powder feeding in hollow ring laser

Fig. 2. Designed model. (a) Front view; (b) top view

Fig. 3. Model diagram of ternary blade

Fig. 4. Layered approach of ternary blade. (a) Slice along radial direction; (b) scanning direction; (c) segmentation in the scanning direction; (d) discrete unit; (e) blade leading edge part; (f) blade trailing edge part

Fig. 5. Formation process of forming trajectory of ternary blade. (a) Main surface; (b) blade leading edge part; (c) blade trailing edge part

Fig. 6. Forming process of ternary blade

Fig. 7. Ternary blade after forming. (a) Blade height; (b) blade thickness; (c) blade leading edge; (d) blade trailing edge

Fig. 8. Microhardness measurement. (a) Measurement positions; (b) microhardness at positions a, b, and c

Fig. 9. Three-dimensional topographies of both sides of ternary blade. (a) (c) (e) R side; (b) (d) (f) L side

Fig. 10. Microstructures of different positions of ternary blade. (a) Position a; (b) position b; (c) position c

Fig. 11. XRD patterns of Inconel 718 powder and the top of ternary blade