Fig. 1. Particle size test results of powder

Fig. 2. Morphology of GH3536 alloy powder

Fig. 3. Light microscope results of sample under different laser powers. (a) 180 W; (b) 220 W; (c) 260 W; (d) 285 W; (e) 300 W

Fig. 4. Light microscope results of sample under different scanning speeds. (a) 700 mm/s; (b) 900 mm/s; (c) 1100 mm/s; (d) 1300 mm/s; (e) 1500 mm/s; (f) 1700 mm/s; (g) 1900 mm/s

Fig. 5. Light microscope results of sample under different scanning spacings. (a) 0.1 mm; (b) 0.14 mm; (c) 0.18 mm; (d) 0.2 mm; (e) 0.22 mm

Fig. 6. Relationship between energy density and relative density

Fig. 7. Relationship between energy density and internal defect type of sample

Fig. 8. Photos of polished sample. (a) Optical microscope photograph when E_v=62.83 J/mm³; (b) optical microscope photograph when E_v=43.98 J/mm³; (c) scanning electron microscope photograph when E_v=43.98 J/mm³

Fig. 9. Results of high precision industrial CT. (a) E_v=80.25 J/mm³; (b) E_v=62.83 J/mm³; (c) E_v=55.56 J/mm³; (d) E_v=41.91 J/mm³; (e) E_v=43.98 J/mm³

Fig. 10. Relation between energy density and defect size