Fig. 1. Schematic diagram of the multi-beam selective laser melting system

Fig. 2. (a),(b) Direct overlap；(c) The separation lines is the interleave overlap of straight lines；(d) The separation lines is the interleave overlap of curves^[16]

Fig. 3. Numerical simulation model and schematic diagram of scanning area

Fig. 4. laser scanning path under different scanning strategies

Fig. 5. (a) Temperature distribution of basic scanning strategy; (b) Temperature distribution under SDSC; (c) Temperature distribution under TDSC

Fig. 6. (a) Residual stress distribution of basic scanning strategy; (b) Residual stress distribution of SDSC; (c) Residual stress distribution of TDSC