Chinese Journal of Lasers, Volume. 52, Issue 8, 0802406(2025)

Cracking Behavior and Gradient Power Processing Strategy in Ultrafast Laser Processing of Hard and Brittle Materials

Yehui Nie1... Bowu Zhang1, Penghui Zhang1, Zhikai Huang1, Kuan Zhao1, and Zhanwen A12,* |Show fewer author(s)
Author Affiliations
  • 1School of Mechanical Engineering, Qinghai University, Xining 810016, Qinghai , China
  • 2Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
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    Figures & Tables(6)
    Schematic diagram of multi-beam microholes machining system
    Crack extension behavior. (a) Cracks are generated by melt solidification at the bottom of the hole; (b) cracks at the bottom of the hole expand outward; (c) cracks start to surround the microholes; (d) cracks are connected and interlaced
    Comparison graphs of single power machining (Ep: laser energy).(a1)‒(a3) Processing 5, 10 and 13 times at 17 W power, respectively; (b1)‒(b3) processing 5, 10 and 13 times at 14.5 W power, respectively; (c1)‒(c3) processing 5, 10 and 13 times at 8 W power, respectively
    Comparison of gradient power machining. (a) Processing 5 times at 17 W power; (b) processing 5 times at 14.5 W + processing 5 times at 17 W power; (c) processing 5 times at 8 W + processing 5 times at 17 W power; (d) processing 5 times at 8 W power + processing 5 times at 14.5 W power + processing 3 times at 17 W power
    In-situ temperature measurement during processing. (a) Schematic diagram of the temperature measurement and characterization of material surface roughness variation; (b) 5 cycles of scanning processing at 17 W power; (c) 5 cycles of scanning processing at 11.5 W power + 3 cycles of scanning processing at 17 W power
    Mechanism of crack formation and extension inhibition by gradient power machining strategy
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    Yehui Nie, Bowu Zhang, Penghui Zhang, Zhikai Huang, Kuan Zhao, Zhanwen A. Cracking Behavior and Gradient Power Processing Strategy in Ultrafast Laser Processing of Hard and Brittle Materials[J]. Chinese Journal of Lasers, 2025, 52(8): 0802406

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    Paper Information

    Category: Laser Micro-Nano Manufacturing

    Received: Oct. 30, 2024

    Accepted: Jan. 6, 2025

    Published Online: Mar. 19, 2025

    The Author Email: Zhanwen A (azw19@tsinghua.org.cn)

    DOI:10.3788/CJL241306

    CSTR:32183.14.CJL241306

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