Fig. 1. 316 stainless steel powder

Fig. 2. Samples after SLM forming (on the substrate)

Fig. 3. Test methods represented by CAD drawings

Fig. 4. Residual stress test platform

Fig. 5. Morphologies of molten pool cross section of SLM formed samples for different process parameters. (a)P=160 W, v=600 mm/s, chess scanning (No.1);(b) P=160 W, v=600 mm/s, stripe scanning (No.2); (c) P=200 W, v=800 mm/s, stripe scanning (No.3); (d) P=200 W, v=600 mm/s, stripe scanning (No.4); (e) P=200 W, v=600 mm/s, chess scanning (No.5); (f) P=240 W, v=800 mm/s, stripe scanning (No.6)

Fig. 6. Comparison of residual stresses in SLM formed samples with different process parameters. (a) No. 1 and No. 5; (b) No. 2 and No. 4; (c) No. 3 and No. 6

Fig. 7. Average residual stress boxplots of SLM formed samples for different process parameters

Table 1. Orthogonal experiment table of SLM sample

Table 2. Comparison of molten pool diameters and residual stresses of SLM formed samples