Fig. 1. Morphology of TC4 titanium alloy powder

Fig. 2. OM images of SLM TC4 titanium alloy. (a) As-deposited state; (b) annealed state; (c) solution state; (d) solution and aging state

Fig. 3. Metallographic photographs of SLM TC4 titanium alloy sample at different magnifications. (a) 100 times (parallel to deposition direction); (b) 500 times (parallel to deposition direction); (c) 100 times (perpendicular to deposition direction); (d) 500 times (perpendicular to deposition direction)

Fig. 4. OM tissue photos of SLM TC4 titanium alloy sample at different magnifications. (a) 100 times (annealed state); (b) 500 times (annealed state); (c) 100 times (solution state); (d) 500 times (solution state); (e) 100 times (solid solution and aging state); (f) 500 times (solid solution and aging state)

Fig. 5. SEM photos of SLM TC4 titanium alloy sample at different magnifications. (a) 1000 times (as-deposited state); (b) 30000 times (as-deposited state); (c) 1000 times (annealed state); (d) 30000 times (annealed state); (e) 1000 times (solution state); (f) 30000 times (solution state); (g) 1000 times (solid solution and aging state); (h) 30000 times (solid solution and aging state)

Fig. 6. Phase content distribution of SLM TC4 titanium alloy in different states. (a) Deposition state; (b) annealed state; (c) solid solution state; (d) solid solution and aging state; (e) α and β phases content comparison histogram

Fig. 7. EBSD grain orientation diagrams of SLM TC4 titanium alloy in different states. (a) Deposition state; (b) annealed state; (c) solid solution state; (d) solid solution and aging state; (e) α and β phases orientation reference map

Fig. 8. KAM diagrams of SLM TC4 titanium alloy samples in different states. (a) Deposition state; (b) annealed state; (c) solid solution state; (d) solid solution and aging state

Fig. 9. Tensile stress-strain curves of TC4 titanium alloy in different states. (a) Deposition state; (b) annealed state; (c) solid solution state; (d) solid solution and aging state

Fig. 10. Comparison of yield strength and tensile strength of TC4 titanium alloy in different states

Fig. 11. Comparison of plastic properties of TC4 titanium alloy in different states

Fig. 12. Fracture morphologies of SLM TC4 titanium alloy tensile sample under different states. (a) 500 times (as deposited state); (b) 5000 times (as deposited state); (c) 500 times (annealed state); (d) 5000 times (annealed state); (e) 500 times (solid solution state); (f) 5000 times (solid solution state); (g) 500 times (solid solution and aging state); (h) 5000 times (solid solution and aging state)

Table 1. Composition of TC4 titanium alloy powder

Table 2. Mechanical properties of SLM TC4 titanium alloy in different states