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Laser & Optoelectronics Progress, Volume. 56, Issue 21, 211402(2019)

Microscopic Characteristic Analysis and Crack Suppression of Laser-Surface Remelting of Vermicular-Graphite Cast-Iron Valve Seats

Ming Pang* and Wendan Tan
Author Affiliations
  • Airport College, Civil Aviation University of China, Tianjin 300300, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (8)
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    References (18)
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    Figures & Tables(8)
    Substrate structure of vermicular-graphite cast-iron

    Fig. 1. Substrate structure of vermicular-graphite cast-iron

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    Macroscopic morphology of laser remelting zone

    Fig. 2. Macroscopic morphology of laser remelting zone

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    Microstructures of central region of laser remelting layer. (a) V=5 mm/s; (b) V=3 mm/s; (c) V=1 mm/s

    Fig. 3. Microstructures of central region of laser remelting layer. (a) V=5 mm/s; (b) V=3 mm/s; (c) V=1 mm/s

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    Microstructures at interface between laser remelting layer and phase-transformation hardening layer. (a) V=5 mm/s; (b) V=3 mm/s; (c) V=1 mm/s

    Fig. 4. Microstructures at interface between laser remelting layer and phase-transformation hardening layer. (a) V=5 mm/s; (b) V=3 mm/s; (c) V=1 mm/s

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    Hardness distribution from substrate to top of remelting layer

    Fig. 5. Hardness distribution from substrate to top of remelting layer

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    Crack numbers under variable laser parameters. (a) Variable laser scanning velocities; (b) variable laser powers

    Fig. 6. Crack numbers under variable laser parameters. (a) Variable laser scanning velocities; (b) variable laser powers

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    Cracks on surface of remelting zone. (a) V=1 mm/s; (b) V=12 mm/s

    Fig. 7. Cracks on surface of remelting zone. (a) V=1 mm/s; (b) V=12 mm/s

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    • Table 1. Chemical compositions of vermicular-graphite cast-iron RuT300 (mass fraction, %)

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      Table 1. Chemical compositions of vermicular-graphite cast-iron RuT300 (mass fraction, %)

      ElementCSiMnPSFe
      Content3.5-3.92.2-2.80.4-0.8<0.06<0.04Bal.
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    Ming Pang, Wendan Tan. Microscopic Characteristic Analysis and Crack Suppression of Laser-Surface Remelting of Vermicular-Graphite Cast-Iron Valve Seats[J]. Laser & Optoelectronics Progress, 2019, 56(21): 211402

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    Paper Information

    Category: Lasers and Laser Optics

    Received: Feb. 20, 2019

    Accepted: May. 5, 2019

    Published Online: Nov. 2, 2019

    The Author Email: Pang Ming (pangming1980@126.com)

    DOI:10.3788/LOP56.211402

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology