Fig. 1. Result analysis. (a) Relationship among laser power, scanning speed, and density; (b) relationship between energy density and density

Fig. 2. Specimen defects at scanning speed of 900 mm/s, under laser power of (a) 135 W, (b) 185 W, (c) 235 W, (d) 285 W, and (e) 335 W, respectively; specimen defects at laser power of 335 W, with scanning speed of (f) 400 mm/s, (g) 500 mm/s, (h) 600 mm/s, (i) 700 mm/s, and (j) 800 mm/s, respectively

Fig. 3. Corrosion specimen defects at scanning speed of 900 mm/s, under laser power of (a) 135 W, (b) 185 W, (c) 235 W, (d) 285 W, and (e) 335 W, respectively; corrosion specimen defects at laser power of 335 W, with scanning speed of (f) 400 mm/s, (g) 500 mm/s, (h) 600 mm/s, (i) 700 mm/s, and (j) 800 mm/s, respectively

Fig. 4. SEM images at scanning speed of 900 mm/s, under laser power of (a)(b) 135 W, (c) 235 W, (g) 185 W, and (i) 335 W, respectively; (h) enlarged view of gas hole in Fig. (g); SEM images at laser power of 335 W, with scanning speed of (d) (e) 400 mm/s, (f) 500 mm/s, and (j) 600 mm/s, respectively

Fig. 5. Simulation results under 135 W and 900 mm/s process parameters. (a) Numerical simulation of molten pool morphology; (b) metallographic micrograph

Fig. 6. Simulation results. (a) Width and depth of molten pool; (b) highest temperature in the molten pool

Fig. 7. Simulation results under 335 W and 400 mm/s process parameters. (a) Numerical simulation of molten pool morphology; (b) metallographic micrograph