Fig. 1. Coaxial powder feeding laser direct metal deposition experiment and schematic of the hardness measurement paths

Fig. 2. Effect of laser scanning speed on macroscopic morphology of deposition layer

Fig. 3. Effect of laser scanning speed on microstructures at the different positions of the deposition layer

Fig. 4. Effect of laser scanning speed on section macroscopic morphologies of the deposition layer. (a) v=6 mm/s, cross section; (b) v=10 mm/s, cross section; (c) v=12 mm/s, cross section; (d) v=6 mm/s, longitudinal section; (e) v=10 mm/s, longitudinal section; (f) v=12 mm/s, longitudinal section

Fig. 5. Effect of laser scanning speed on impurities in deposition layer. (a) v=6 mm/s； (b) v=10 mm/s

Fig. 6. Effect of laser scanning speed on hardness of the deposition layer. (a) Path 1; (b) path 2

Fig. 7. Effect of laser scanning speed on corrosion resistance of deposition layer

Fig. 8. Effect of laser scanning speed on wear resistance of deposition layer

Fig. 9. Wear morphologies of deposition layer prepared at different laser scanning speeds. (a)v=6 mm/s; (b)v=10 mm/s; (c)v=12 mm/s