Infrared and Laser Engineering, Volume. 51, Issue 12, 20220143(2022)
Influence of different water-assisted methods on femtosecond laser layered-ring trepanning in superalloy
Figures & Tables(13)
Fig. 1. Schematic diagram of water-assisted femtosecond laser layered-ring trepanning system. (a) In air; (b) Water-based; (c) Water film
Fig. 3. The morphology of the hole entrance/exit at different pulse repetition frequencies. (a) In air; (b) Water-based; (c) Water film
Fig. 4. Effect of laser pulse repetition rate on hole diameter. (a) Hole entrance; (b) Hole exit
Fig. 5. Hole sidewall morphology at different pulse repetition rates. (a) In air; (b) Water-based; (c) Water film
Fig. 7. CLSM 3D morphology for different inwall locations of the hole at laser pulse repetition rate of 300 kHz. (a) In air; (b) Water-based; (c) Water film
Fig. 8. SEM observation for hole sections at laser pulse repetition rate of 300 kHz. (a) In air; (b) Water-based; (c) Water film
Fig. 9. Effect of laser pulse repetition rate on the hole sidewall roughness. (a) Hole entrance; (b) Hole middle; (c) Hole exit
Table 1. Chemical composition of nickel-based superalloy GH4220
View tableView in ArticleTable 1. Chemical composition of nickel-based superalloy GH4220
Composition Cr Ni Co W Mo Al Ti V Mass fraction 9%-12% Allowance 14%-15.5% 5%-6.5% 5%-7% 3.9%-4.8% 2.2%-2.9% 0.25%-0.8% Composition C Fe B Ce Mg Mn Si P Mass fraction ≤0.08% ≤3% ≤0.02% ≤0.02% ≤0.01% ≤0.5% ≤0.35% ≤0.015% Composition S Cu Pb As Sn Sb Bi — Mass fraction ≤0.009% ≤0.07% ≤0.001% ≤0.002 5% ≤0.001 2% ≤0.002 5% ≤0.000 1% —
Table 2. Specific parameters used in the experiment
View tableView in ArticleTable 2. Specific parameters used in the experiment
Laser pulse duration/ fs Laser spot diameter/μm Pulse repetition rate/kHz Scanning speed/mm·s−1 Singer laser pulse energy/μJ Feed distance/ mm Feed rate/ μm·layer−1 276 30 50-300 50 80 1 20
Table 3. Improvement of hole diameter and taper under different pulse repetition rates using two water-assisted methods compared with air conditions
View tableView in ArticleTable 3. Improvement of hole diameter and taper under different pulse repetition rates using two water-assisted methods compared with air conditions
Pulse repetition rate/kHz 50 100 150 200 250 300 Hole entrance Water-based 4.67% 8.05% 10.93% 12.73% 12.59% 9.29% Water film 6.91% 9.19% 12.59% 9.18% 8.20% 3.27% Hole exit Water-based 37.07% 42.86% 34.02% 43.82% 47.29% 50.38% Water film 30.64% 30.36% 29.99% 30.49% 29.21% 22.62% Hole taper angle Water-based −14.15% −18.04% −9.93% −10.45% −11.34% −15.29% Water film −6.40% −7.07% −3.24% −6.19% −5.84% −7.96%
Table 4. Improvement of hole sidewall roughness under different pulse repetition rates using two water-assisted methods compared with air conditions
View tableView in ArticleTable 4. Improvement of hole sidewall roughness under different pulse repetition rates using two water-assisted methods compared with air conditions
Pulse repetition rate/kHz 50 100 150 200 250 300 Hole entrance Water-based −33.95% −51.26% −54.17% −55.39% −54.44% −65.56% Water film −9.88% −21.85% −33.07% −32.08% −41.78% −53.89% Hole middle Water-based −38.64% −49.49% −45.82% −63.47% −74.49% −80.49% Water film −12.09% −28.17% −19.41% −45.10% −57.61% −56.84% Hole exit Water-based −39.95% −43.29% −46.53% −61.68% −72.62% −85.43% Water film −20.10% −26.84% −31.71% −35.95% −40.65% −22.10%
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Naifei Ren, Huayu Yang, Kaibo Xia. Influence of different water-assisted methods on femtosecond laser layered-ring trepanning in superalloy[J]. Infrared and Laser Engineering, 2022, 51(12): 20220143
Paper Information
Category: Lasers & Laser optics
Received: Mar. 3, 2022
Accepted: --
Published Online: Jan. 10, 2023
The Author Email: Xia Kaibo (xiakaibo@ujs.edu.cn)
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