Fig. 1. HNS powder . (a) Morphology; (b) particle size distribution

Fig. 2. Schematic of SLM forming equipment

Fig. 3. Schematic of laser scanning direction for SLM formed metallographic specimen and tensile specimen

Fig. 4. Tensile test platform with high-energy synchronous X-ray

Fig. 5. Cross-section photos of SLM formed samples under different E_v. (a) Optical photo when E_v=190.5 J·mm^-3; (b) optical photo when E_v=238.1 J·mm^-3; (c) optical photo when E_v=285.7 J·mm^-3 ; (d) SEM photo when E_v=238.1 J·mm^-3

Fig. 6. Relative densities of SLM formed samples under different E_v

Fig. 7. XRD patterns of SLM formed samples under different E_v

Fig. 8. Microstructures of SLM formed samples under different E_v. (a) E_v=190.5 J·mm^-3; (b) E_v=238.1 J·mm^-3; (c) E_v=285.7 J·mm^-3; (d) local magnification of microstructure in box area in Fig. 8(b)

Fig. 9. Tensile properties of samples under different E_v

Fig. 10. Fracture morphologies of tensile specimens formed by SLM under different E_v. (a)(d) E_v=190.5 J·mm^-3; (b)(e) E_v=238.1 J·mm^-3; (c)(f) E_v=285.7 J·mm^-3

Fig. 11. Test results by high-energy X-ray synchrotron radiation. (a) Diffraction rings of specimen before tension by high-energy X-ray synchrotron radiation; (b) XRD patterns by synchrotron radiation

Fig. 12. Behavior of nitrogen during SLM