Fig. 1. Laser deposition manufacturing system

Fig. 2. Laser depositon manufactured sample and fatigue samples. (a) Size of deposited sample and sampling direction of fatigue samples; (b) shape and size of fatigue samples

Fig. 3. Deposited microstructures of titanium alloy. (a) Macrostructure of Ti-6Al-2Mo-2Sn-2Zr-2Cr-2V; (b)(c) microstructures of Ti-6Al-2Mo-2Sn-2Zr-2Cr-2V; (d) microstructure of Ti-6Al-4V

Fig. 4. Microstructures of titanium alloy after solution and aging. (a) Columnar structure; (b) primary α-phase and secondary α-phase; (c) colony of α lath at columnar crystal boundary

Fig. 5. Maximum stress as a function of number of cycles to failure (S-N curve) of laser deposition manufactured titanium alloys (R=0.06)

Fig. 6. Surface morphology of fatigue fracture

Fig. 7. Microcosmic morphology of fatigue source zone. (a) Strip crack source; (b) pore crack source; (c) deep-seated pore

Fig. 8. Fatigue source under different stress levels and locations. (a) Sample A, surface pore; (b) sample B, surface pore; (c) sample C, deep-seated pore

Fig. 9. Microscopic morphology of crack propagation zone

Fig. 10. Secondary cracks appearing in main fatigue cracks growth. (a) Secondary crack parallel to main cracks; (b) secondary crack perpendicular to main cracks

Fig. 11. Microscopic morphology of transient zone