Fig. 1. Morphology of GH4099 alloy powders

Fig. 2. Size of tensile specimen

Fig. 3. Microstructures of as-deposited GH4099 alloy. (a) OM morphology of as-deposited sample; (b) microstructure of columnar dendrite; (c) microstructure of layer boundaries; (d) SEM image of γ-γ' eutectic phase

Fig. 4. Microstructures of GH4099 alloy fabricated by laser additive manufacturing after heat treatment. (a) OM image of solution treated sample; (b) OM image of solution-aging treated sample; (c) SEM image of solution treated sample; (d) SEM image of solution-aging treated sample

Fig. 5. Mechanical properties of GH4099 alloy fabricated by laser additive manufacturing after different heat treatments.(a) Strength; (b) elongation