Fig. 1. Particle size distribution of AlSi10Mg alloy powder

Fig. 2. FS271M laser selective melting (SLM) equipment

Fig. 3. Powder bed and forming melt channel

Fig. 4. Formed melt channels and their microscopic morphologies

Fig. 5. Change of melt channel width with scanning speed

Fig. 6. SLM forming. (a) SLM forming physical process; (b) mesoscopic numerical model of SLM process

Fig. 7. Profile view of laser action

Fig. 8. Thermal conductivity, specific heat capacity, dynamic viscosity, and density as a function of temperature for AlSi10Mg

Fig. 9. Comparison of single-channel appearances under 100 W power and different scanning speeds

Fig. 10. Microscopic appearance of single-channel formed under 100 W laser power and different scanning speeds

Fig. 11. Comparison of small particle spheroidization (left: particle sputtering area; right: no sputtering area)

Fig. 12. Microscopic appearance of double-channel (left: 800 mm/s; right: 1000 mm/s)

Fig. 13. Temperature evolution diagram at a point in the powder bed

Fig. 14. Section of molten pool at 500 mm/s scanning speed

Fig. 15. Timing diagrams of single-channel forming section at 200 mm/s scanning speed

Fig. 16. Surface and section images of single-channel at 200 mm/s scanning speed

Fig. 17. Single-channel appearance at different preheating temperatures

Fig. 18. Variation of molten pool sizes at different preheating temperatures