Fig. 1. Photo of LDM equipment

Fig. 2. LDF4000-100 laser device

Fig. 3. Schematic of tensile specimen size

Fig. 4. Photograph of tensile specimens

Fig. 5. Appearances of sediment layer obtained at different laser output powers. (a) 1200 W; (b) 1400 W; (c) 1600 W

Fig. 6. Effects of laser output power on deposited layer width and height

Fig. 7. Appearances of sediment layer obtained at different scanning speeds. (a) 5 mm·s-1; (b) 7 mm·s-1; (c) 9 mm·s-1

Fig. 8. Effects of scanning speed on deposited layer width and height

Fig. 9. Appearances of sediment layers obtained at different powder feeding speeds. (a) 4.25 g·min-1; (b) 5.67 g·min-1; (c) 7.07 g·min-1

Fig. 10. Effects of powder feeding speed on deposited layer width and height

Fig. 11. Microstructures of multilayer and multichannel deposited sample. (a) Macrostructure; (b) microstructure in area A; (c) microstructure in area B

Fig. 12. SEM morphology and EDX spectrum of undecomposed niobium in deposited layer. (a) SEM topography; (b) EDX spectrum

Fig. 13. SEM photos of deposited layer. (a) SEM topography; (b) amplified SEM topography

Fig. 14. Map scanning analysis of deposited layer. (a) SEM photo; (b) titanium element scanning; (c) aluminum element scanning; (d) niobium element scanning; (e) chromium element scanning

Fig. 15. X-ray diffraction analysis of deposited layer

Fig. 16. Hardness distribution of deposited sample

Fig. 17. Fracture of samples at room temperature. (a)-(b) Compressive sample; (c)-(d) tensile sample