Fig. 1. Diagram of laser remelt scanning strategy with an interval of 2 layers

Fig. 2. Diagram of different interval forming modes

Fig. 3. Photos of samples during and after forming. (a) During forming; (b) after forming

Fig. 4. Schematic diagram of interlayer laser remelting scanning strategy

Fig. 5. Schematic diagram of internal residual stress test

Fig. 6. Geometric configuration diagram of finite element analysis

Fig. 7. Nephogram of stress distribution in forming layer at different time

Fig. 8. Residual stress curves under different laser remelting intervals. (a) Interval of 0‒10 layers; (b) interval of 0, 2, 5, 10 layers

Fig. 9. Nephogram of residual stress distribution under different laser remelting intervals. (a) Unremelting; (b) interval of 2 layers; (c) interval of 5 layers; (d) interval of 10 layers

Fig. 10. Schematic diagram of internal residual stress generation

Fig. 11. Residual stress test results. (a) Residual stress curves; (b) residual stress boxplot

Fig. 12. Interlayer laser remelting morphology comparison

Fig. 13. Micro topography of molten pool center on top surface. (a) Unremelted topography; (b) remelted topography

Fig. 14. Microstructures of molten pool center on top surface. (a) Unremelted microstructure; (b) remelted microstructure

Fig. 15. Three-dimensional topography of top surface. (a) Unremelted topography; (b) remelted topography

Fig. 16. Three-dimensional topography of top surface roughness. (a) Unremelted topography; (b) remelted topography

Fig. 17. Tensile stress-strain curves

Fig. 18. Tensile fracture morphology of the samples. (a) Unremelting; (b) interval of 2 layers; (c) interval of 5 layers; (d) interval of 10 layers

Fig. 19. Impact absorbed energy at different interval of laser remelting

Fig. 20. Impact fracture morphology of the sample. (a) Unremelting; (b) interval of 2 layers; (c) interval of 5 layers; (d) interval of 10 layers

Fig. 21. Microhardness diagram of the top surface of the samples