Fig. 1. Experimental setup, weld morphology, and sampling method. (a) Schematic of experimental device; (b) surface and cross-sectional morphologies of weld seam; (c) sampling methods for mechanical property testing specimens and microstructure observation specimens

Fig. 2. SLMed 304 microstructures, EBSD plots, and grain size distributions. (a) XOY surface microstructure; (b) XOY EBSD plot; (c) grain size distribution on XOY plane; (d) XOZ surface microstructure; (e) XOZ EBSD plot; (f) grain size distribution on XOZ plane

Fig. 3. SLMed GH3536 microstructures, EBSD plots, and grain size distributions. (a) XOY surface microstructure; (b) XOY EBSD plot; (c) grain size distribution on XOY plane; (d) XOZ surface microstructure; (e) XOZ EBSD plot; (f) grain size distribution on XOZ plane

Fig. 4. SLMed GH3536/SLMed 304 butt joint weld structures. (a) Upper structure at 304 side ; (b) middle structure at 304 side; (c) lower structure at 304 side; (d) upper structure in weld center; (e) middle structure in weld center; (f) lower structure in weld center; (g) upper structure at GH3536 side; (h) middle structure at GH3536 side; (i) lower structure at GH3536 side; (j) observation positions of weld and tissue

Fig. 5. Unmixed zone at boundary between SLMed 304 and weld fusion zone. (a) OM image; (b) SEM image; (c) EDS element test result

Fig. 6. Characteristics of GH3536 side structure of upper weld. (a) Image of upper weld; (b) GH3536 side structure of upper weld; (c) layer-by-layer solidification line; (d) EDS point scanning test of seam structures in stratified area and its vicinity

Fig. 7. Element transition zone at GH3536 side. (a) OM image; (b) SEM image; (c) EDS test result

Fig. 8. EDS test results of Fe, Ni and Mo elements at each position of weld. (a) Upper part of welded joint; (b) middle part of welded joint; (c) lower part of welded joint

Fig. 9. XRD analysis results of weld and base metals

Fig. 10. Microhardness distribution of welded joint

Fig. 11. Room temperature properties, post-fracture states, and fracture morphologies of base materials and weld. (a) SLMed GH3536 tensile specimen; (b) SLMed 304 tensile specimen; (c) SLMed GH3536/SLMed 304 weld tensile specimen; (d) bar chart of tensile property at room temperature; (e) stress-strain curves; (f) fracture morphology of SLMed GH3536 tensile specimen; (g) fracture morphology of SLMed 304 tensile sample; (h) fracture morphology of SLMed GH3536/SLMed 304 joint tensile specimen