Chinese Journal of Lasers, Volume. 50, Issue 4, 0402020(2023)
Effect of Nanosecond Pulsed Laser Cleaning Scanning Speed on Cleaning Quality of Oxide Films on TC4 Titanium Alloy Surface
Figures & Tables(16)
Fig. 1. Schematics of laser cleaning system and scanning path. (a) Laser cleaning system; (b) scanning path
Fig. 2. Effect of laser scanning speed on macroscopic surface morphology of TC4 titanium alloy. (a) Before cleaning; (b) 500 mm/s;
Fig. 3. Effect of laser scanning speed on microscopic surface topography of TC4 titanium alloy. (a) Before cleaning; (b) 500 mm/s; (c) 3000 mm/s; (d) 6000 mm/s; (e) 9000 mm/s; (f) 10000 mm/s
Fig. 4. Images of single laser spot acting on TC4 titanium alloy substrate at different scanning speeds. (a) 500 mm/s; (b) 3000 mm/s; (c) 6000 mm/s; (d) 9000 mm/s; (e) 10000 mm/s
Fig. 5. EDS spectra and analysis results for cleaned TC4 titanium alloy surface at different laser scanning speeds . (a) Before cleaning; (b) 500 mm/s; (c) 3000 mm/s; (d) 6000 mm/s; (e) 9000 mm/s; (f) 10000 mm/s
Fig. 6. Effects of scanning speed on element mass fraction and phase of TC4 surface. (a) Element mass fraction of TC4 surface; (b) XRD pattern of TC4 surface
Fig. 7. Effects of laser scanning speed on XPS spectra of Ti and O on TC4 titanium alloy surface. (a) (b) (c) Before cleaning;
Fig. 10. Cross sections of remelted layers on surface of TC4 titanium alloy after cleaning at different laser scanning speeds. (a) Sections before laser cleaning (right) and after laser cleaning (left); (b) 500 mm/s; (c) 3000 mm/s; (d) 6000 mm/s; (e) 9000 mm/s; (f) 10000 mm/s
Fig. 11. Effect of scanning speed on dynamic potential polarization curve of TC4 titanium alloy surface
Fig. 12. Schematic of formation of remelted layer and dense oxide film on TC4 surface during laser cleaning
Table 1. Chemical compositions of TC4 titanium alloy
View tableTable 1. Chemical compositions of TC4 titanium alloy
Chemical composition Ti Al V Fe C N H O Mass fraction /% Bal. 5.500-6.750 3.500-4.500 0.300 0.080 0.050 0.015 0.200
Table 2. Parameters of laser cleaning process
View tableTable 2. Parameters of laser cleaning process
Laser parameter Value line spacing（L）/μm 20 Average laser power（P）/W 30 Repetition rate（f）/kHz 600 Scanning speed（v）/（mm/s） 500，3000，6000，9000，10000
Table 3. Input pulse number and cumulative input energy in single spot region and spot overlap ratio
View tableTable 3. Input pulse number and cumulative input energy in single spot region and spot overlap ratio
Scanning speed
v /（mm/s）
Number of pulses
N
Accumulate energy
E /mJ
Overlap ratio
δ /%
500 60.00 3.00 98.3 3000 10.00 0.50 90.0 6000 5.00 0.25 80.0 9000 3.33 0.17 70.0 10000 3.00 0.15 66.7
Table 4. Self-corrosion potentials and self-corrosion current densities of TC4 titanium alloy before and after laser cleaning
View tableTable 4. Self-corrosion potentials and self-corrosion current densities of TC4 titanium alloy before and after laser cleaning
Scanning speed /（mm/s） Self-corrosion potential /V Self-corrosion current density /（A·cm-2） Before cleaning -0.39 2.21×10-7 500 -0.30 1.25×10-7 3000 -0.32 1.89×10-7 6000 -0.32 7.79×10-8 9000 -0.30 6.24×10-8 10000 -0.29 7.20×10-8
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Dasong Liao, Qian Wang, Feisen Wang, Hui Chen, Fei Ji, Ting Wen, Lei Zhou. Effect of Nanosecond Pulsed Laser Cleaning Scanning Speed on Cleaning Quality of Oxide Films on TC4 Titanium Alloy Surface[J]. Chinese Journal of Lasers, 2023, 50(4): 0402020
Paper Information
Category: laser manufacturing
Received: May. 5, 2022
Accepted: Jun. 28, 2022
Published Online: Feb. 2, 2023
The Author Email: Chen Hui (xnrpt@swjtu.edu.cn)
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