Rongwei Zhang, Le Wan, Tuo Shi, Jie Wu, Geyan Fu, Rui Zhuang, Mengying Cheng. Multi-Degree of Freedom Conformal Laser Metal Deposition Process and Precision of Thin-Walled Hollow Sphere[J]. Chinese Journal of Lasers, 2021, 48(22): 2202018
- Chinese Journal of Lasers
- Vol. 48, Issue 22, 2202018 (2021)
Fig. 1. Schematic of N2-supplied protective hollow beam deposition nozzle
Fig. 2. Model and data processing. (a) Hollow sphere model and its quarter section; (b) horizontal dislocation stratification method; (c) normal stratification method
Fig. 3. Continuous multi-position LMD process. (a) LMD experimental design; (b) three posture forming design
Fig. 4. Stages ① of the deposition process. (a) Experimental design; (b) mechanical model of the molten pool; (c) experimental process
Fig. 5. Stages ② of the deposition process. (a) Experimental design; (b) mechanical model of the molten pool; (c) experimental process
Fig. 6. Stages ③ of the deposition process. (a) Experimental design; (b) mechanical model of the molten pool
Fig. 7. LMD forming of hollow sphere. (a) Hollow sphere at stage ③; (b) final closed deposition; (c) surface remelting
Fig. 8. Hollow sphere size. (a) Half-section of model; (b) formed part cut along the center line
Fig. 9. Curves of outer radius and thickness of the as-deposited hollow sphere with deposition angle α
Fig. 10. Microstructure of the as-deposited hollow sphere change with deposition angle α
Fig. 11. Curves of grain size and micro-hardness of the as-deposited hollow sphere with deposition angle α. (a) Grain size; (b) micro-hardness
Fig. 12. Hollow sphere fabricated by LMD. (a) Typical surface 3D topography; (b) curve of surface roughness with deposition angle α
Fig. 13. Hollow sphere fabricated by LMD. (a) Surface re-melting; (b) roughness line profile of re-melting surface
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Table 1. Chemical composition of 316L stainless steel powder unit: %
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