Fig. 1. SEM image and powder particle size distribution diagram of Fe-Mn-Cr-Ni MEA. (a) SEM image of alloy powder; (b) powder particle size distribution diagram

Fig. 2. Schematic diagram of process of preparing Fe-Mn-Cr-Ni MEA by SLM

Fig. 3. Density curve of SLM-formed Fe-Mn-Cr-Ni MEA with VED and morphology diagrams of pores inside the alloy

Fig. 4. Surface morphology and magnification of SLM-formed Fe-Mn-Cr-Ni MEA under different VEDs. (a)(b) 55.56 J/mm³; (c)(d) 88.44 J/mm³; (e)(f) 104.76 J/mm³; (g)(h) 130.95 J/mm³

Fig. 5. 3D morphologies of SLM-formed Fe-Mn-Cr-Ni MEA surface under different VEDs. (a) 55.56 J/mm³; (b) 88.44 J/mm³; (c) 104.76 J/mm³; (d) 130.95 J/mm³

Fig. 6. Internal defects morphologies in SLM-formed Fe-Mn-Cr-Ni MEA under different VEDs. (a)(b) Unfused defect; (c) spherical porosity; (d)‒(i) keyhole effect

Fig. 7. Keyhole morphologies and elemental distribution in SLM-formed Fe-Mn-Cr-Ni MEA

Fig. 8. XRD patterns and enlarged views of some crystal plane diffraction peaks of SLM-formed Fe-Mn-Cr-Ni MEA under three VEDs. (a) XRD patterns; (b) enlarged view of the diffraction peak of (111) crystal face

Fig. 9. Hot crack morphologies and elemental distribution of SLM-formed Fe-Mn-Cr-Ni MEA under high VED

Fig. 10. Variation curve of microhardness of Fe-Mn-Cr-Ni MEA formed by SLM with VED and stress-strain curves under three VEDs. (a) The microhardness changes with VED; (b) stress-strain curves under three VEDs

Fig. 11. Process window diagram for SLM-formed Fe-Mn-Cr-Ni MEA