Fig. 1. Working principle of forming system

Fig. 2. Morphology, chemical composition, and particle size distribution of 316L stainless steel powder. (a) SEM morphology and chemical composition; (b) particle range

Fig. 3. Schematics of sample size. (a) Cube sample; (b) tensile sample

Fig. 4. Position relationship between SLM equipment and high-speed camera

Fig. 5. Three different types of splashes^[29]

Fig. 6. Dynamic variation images of spatters captured by high speed camera. (a)-(c) Single laser scanning; (d)-(f) dual-laser low-power synchronous scanning; (g)-(i) dual-laser high-speed synchronous scanning

Fig. 7. Forming mechanism of spatters. (a) Dual-laser low-power synchronous scanning; (b) dual-laser high-speed synchronous scanning

Fig. 8. Effect of energy density on relative density

Fig. 9. Molten pool morphologies of samples under different process parameters. (a)-(c) Single laser scanning; (d)-(f) dual-laser low-power synchronous scanning; (g)-(i) dual-laser high-speed synchronous scanning

Fig. 10. SEM images of 316L forming samples. (a)-(c) Single laser; (d)-(f) dual-laser low-power synchronous scanning; (g)-(i) dual-laser high-speed synchronous scanning

Fig. 11. Mechanical properties of samples formed in different laser scanning modes. (a) Stress-strain curves; (b) mean value histogram

Fig. 12. Fracture morphologies of tensile samples. (a)-(b) Single laser scanning; (c)-(d) dual-laser low-power synchronous scanning; (e)-(f) dual-laser high-speed synchronous scanning