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Chinese Journal of Lasers, Volume. 45, Issue 1, 102005(2018)

Effect of Protective Atmosphere on Pores in Laser Remelting Zone of Gray Cast Iron

Zhang Kun1,2、*, Liu Keyuan1,2, Ye Zhengting1,2, Zhao Haixing3, Yang Gaolin1,2, Cui Jinpeng3, Hu Yong1,2, and Yao Jianhua1,2
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  • 1[in Chinese]
  • 2[in Chinese]
  • 3[in Chinese]
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    AbstractGet PDF(in Chinese)
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    Figures & Tables(12)
    Microstructure of HT250 gray cast iron

    Fig. 1. Microstructure of HT250 gray cast iron

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    Schematic of laser reciprocating scanning

    Fig. 2. Schematic of laser reciprocating scanning

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    Cross-sectional morphologies of samples under argon shielding at different scanning speeds. (a) 20 mm·s-1; (b) 60 mm·s-1; (c) 100 mm·s-1; (d) 200 mm·s-1

    Fig. 3. Cross-sectional morphologies of samples under argon shielding at different scanning speeds. (a) 20 mm·s-1; (b) 60 mm·s-1; (c) 100 mm·s-1; (d) 200 mm·s-1

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    Cross-sectional morphologies of samples under open atmosphere at different scanning speeds. (a) 20 mm·s-1; (b) 60 mm·s-1; (c) 100 mm·s-1; (d) 200 mm·s-1

    Fig. 4. Cross-sectional morphologies of samples under open atmosphere at different scanning speeds. (a) 20 mm·s-1; (b) 60 mm·s-1; (c) 100 mm·s-1; (d) 200 mm·s-1

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    Longitudinal-sectional morphologies of samples under argon shielding at different scanning speeds. (a) 20 mm·s-1; (b) 60 mm·s-1; (c) 100 mm·s-1; (d) 200 mm·s-1

    Fig. 5. Longitudinal-sectional morphologies of samples under argon shielding at different scanning speeds. (a) 20 mm·s-1; (b) 60 mm·s-1; (c) 100 mm·s-1; (d) 200 mm·s-1

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    Longitudinal-sectional morphologies of samples under open atmosphere at different scanning speeds. (a) 20 mm·s-1; (b) 60 mm·s-1; (c) 100 mm·s-1; (d) 200 mm·s-1

    Fig. 6. Longitudinal-sectional morphologies of samples under open atmosphere at different scanning speeds. (a) 20 mm·s-1; (b) 60 mm·s-1; (c) 100 mm·s-1; (d) 200 mm·s-1

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    SEM images of remelting zone under argon shielding. (a) Pore with scanning speed of 20 mm·s-1; (b) pore with scanning speed of 20 mm·s-1; (c) pore with scanning speed of 200 mm·s-1; (d) unmelted graphite with scanning speed of 200 mm·s-1; (e) unmelted graphite in Fig. 7(d); (f) graphite in HT250 substrate

    Fig. 7. SEM images of remelting zone under argon shielding. (a) Pore with scanning speed of 20 mm·s-1; (b) pore with scanning speed of 20 mm·s-1; (c) pore with scanning speed of 200 mm·s-1; (d) unmelted graphite with scanning speed of 200 mm·s-1; (e) unmelted graphite in Fig. 7(d); (f) graphite in HT250 substrate

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    SEM images of pores in remelting zone under open atmosphere at different scanning speeds. (a) 20 mm·s-1; (b) 20 mm·s-1; (c) 200 mm·s-1; (d) 200 mm·s-1

    Fig. 8. SEM images of pores in remelting zone under open atmosphere at different scanning speeds. (a) 20 mm·s-1; (b) 20 mm·s-1; (c) 200 mm·s-1; (d) 200 mm·s-1

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    Flow schematic of molten pool in laser remelting of gray cast irons under different conditions. (a) Argon shielding; (b) open atmosphere

    Fig. 9. Flow schematic of molten pool in laser remelting of gray cast irons under different conditions. (a) Argon shielding; (b) open atmosphere

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    • Table 1. Chemical compositions of HT250 gray cast iron (mass fraction, %)

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      Table 1. Chemical compositions of HT250 gray cast iron (mass fraction, %)

      ElementSiMnPONHCSFe
      Value1.380.940.0320.04430.0150.00253.000.09194.495

    • Table 2. Process parameters and results of laser remelting experiment

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      Table 2. Process parameters and results of laser remelting experiment

      SamplenumberScanningspeed /(mm·s-1)Depth ofremeltingzone /μmWidth ofremeltingzone /μm
      A1205821581
      A2605001382
      A31003361291
      A42002911182
      B1208181782
      B2607231680
      B31006641391
      B42003821291

    • Table 3. EDS results at different areas in Fig. 7 and Fig. 8 (mass fraction, %)

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      Table 3. EDS results at different areas in Fig. 7 and Fig. 8 (mass fraction, %)

      PictureCNOSiFe
      Fig. 7(b)15.142.7610.140.9870.98
      Fig. 7(d)88.32-6.980.164.54
      Fig. 8(c)6.531.245.342.6884.21
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    Zhang Kun, Liu Keyuan, Ye Zhengting, Zhao Haixing, Yang Gaolin, Cui Jinpeng, Hu Yong, Yao Jianhua. Effect of Protective Atmosphere on Pores in Laser Remelting Zone of Gray Cast Iron[J]. Chinese Journal of Lasers, 2018, 45(1): 102005

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    Paper Information

    Category: laser manufacturing

    Received: Apr. 14, 2017

    Accepted: --

    Published Online: Jan. 24, 2018

    The Author Email: Kun Zhang (956818952@qq.com)

    DOI:10.3788/CJL201845.0102005

    Topics

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