Fig. 1. SEM morphologies of Ti6Al4V powder. (a) 50×; (b) 200×

Fig. 2. Particle size distribution and laser absorptivity of Ti6Al4V powder. (a) Particle size distribution; (b) laser absorptivity

Fig. 3. Finite element model. (a) Finite element model of substrate and powder layer and its mesh; (b) top view; (c) side view

Fig. 4. Double ellipsoid heat source model

Fig. 5. Tensile samples. (a) Shape and size; (b) physical photo

Fig. 6. Simulation results of molten pool width at different scanning speeds and laser powers

Fig. 7. Simulation results of molten pool depth at different scanning speeds and laser powers

Fig. 8. Cross sections of molten pool at different scanning speeds and laser powers

Fig. 9. Simulation results and experimental results at different laser powers. (a) 340 W; (b) 370 W

Fig. 10. Relative density values of samples at different scanning speeds and hatch spacings

Fig. 11. Horizontal-section metallographic micrographs of samples at different scanning speeds. (a) 800 mm/s; (b) 850 mm/s;

Fig. 12. Vertical-section metallographic micrographs of samples at different scanning speeds. (a) 800 mm/s; (b) 850 mm/s;

Fig. 13. Microstructures of sample obtained at 370 W laser power, 0.10 mm hatch spacing, and 1050 mm /s scanning speed.

Fig. 14. Tensile stress-strain curves of samples formed under optimum process parameters

Fig. 15. Fracture morphologies of tensile sample. (a) 50×; (b)(c) 200×; (d) 3000×

Fig. 16. Comparison of SLM results based on Ti6Al4V powder with different particle sizes. (a) Mechanical properties; (b) forming rate