Fig. 1. SEM morphology of DZ125 superalloy powder

Fig. 2. (a) Laser deposition equipment; (b) Schematic diagram of laser deposition repaired DD5 alloy

Fig. 3. Cross-section macroscopic morphology of single-layer deposition zone

Fig. 4. Cross-section macroscopic morphology of deposition region with different laser processing parameters

Fig. 5. (a) Influence of the laser processing parameters on width W of deposition zone; (b) Influence of the laser processing parameters on height H, remelted height H_Rand total height H+H_R of deposition zone

Fig. 6. (a) Influence of the laser processing parameters on dendrite epitaxial growth height H_E of deposition zone; (b) Influence of the laser processing parameters on the ratio of dendrite epitaxial growth η of deposition zone

Fig. 7. (a) Cross-section macroscopic morphology of the deposition zone; (b) Macrostructure of the deposition zone

Fig. 8. (a) Macrostructure of the substrate; (b) Macrostructure of the deposition zone; (c) Equiaxed crystal; (d) CET region; (e) Columnar crystals; (f) Planar crystal

Fig. 9. (a) γ' morphology of the substrate; (b) γ' morphology of the heat affected zone; (c) γ' morphology of the dendritic epitaxial growth region of deposition zone

Fig. 10. (a) Partition coefficient between the core-dendritic and inter-dendritic region of deposition zone; (b) Amplitude of solution concentration between the core-dendritic and inter-dendritic region of deposition zone

Fig. 11. (a) Carbide distributions in the substrate; (b) Carbide morphology of the substrate; (c) Carbide morphology of the heat affected zone

Fig. 12. (a) Carbide distributions in middle and lower of the deposition zone; (b) Carbide distributions in top of the deposition zone; (c) Carbide morphologies at the bottom; (d) Carbide morphologies at the middle; (e) Carbide morphologies at the top

Fig. 13. (a) Microhardness of substrate and deposition zone； (b) Average microhardness