Fig. 1. Schematic of S-type orthogonal scanning strategy

Fig. 2. Morphology and particle size distribution of IN738 alloy powder with different particle sizes. (a)?(c) Particle morphology of 1 # powder, 2 # powder, and 3 # powder; (d)?(f) particle size distribution of 1 # powder, 2 # powder, and 3 # powder

Fig. 3. Surface roughness and density of SLM formed parts

Fig. 4. Surface morphology of 2 # powder SLM forming parts. (a) XOY plane; (b) XOZ plane

Fig. 5. Porosity and crack density of SLM shaped parts prepared with powders of different particle sizes

Fig. 6. Schematic of powder spreading with different particle sizes. (a) Powder particle size ratio is uniform; (b) single powder size

Fig. 7. 2 # powder SLM formed parts XOY and XOZ plane IPF grain structure diagram and microstructure. (a) XOY plane IPF; (b) XOZ plane IPF; (c) XOY plane microtopography; (d) XOZ plane microtopography

Fig. 8. Schematic of molten pool organization model on XOY plane and XOZ plane. (a) Single molten pool model; (b) (c) top view of Fig. (a); (d) schematic of cutting position; (e) molten pool on XOY plane; (f) molten pool on XOZ plane