Fig. 1. Surface morphology and composition of GH3030 superalloy. (a) Original plate; (b) Micro morphology; (c) Surface composition and content; (d) XRD pattern

Fig. 2. Schematic diagram of laser cleaning device

Fig. 3. Schematic diagram of laser scanning mode and spot overlapping

Fig. 4. Surface macro morphology before and after laser cleaning

Fig. 5. Surface morphology of the sample after laser cleaning with different spot overlapping rates. (a) Not cleaned; (b) 58.33%; (c) 62.5%; (d) 66.67%; (e) 70.83%; (f) 75%

Fig. 6. Surface micro morphology of laser cleaning samples under different spot overlapping rates. (a1) Not cleaned; (b1) 58.33%; (c1) 62.5%; (d1) 66.67%; (e1) 70.83%; (a2)-(e2) Corresponding high magnification images

Fig. 7. Schematic diagram of laser cleaning process

Fig. 8. Change trend of element content

Fig. 9. XRD pattern of GH3030 superalloy surface before and after laser cleaning

Fig. 10. Effect of laser spot overlapping rate on sample surface roughness

Fig. 11. Microhardness of substrate before and after laser cleaning. (a) Microhardness of different points; (b) Average microhardness