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Chinese Journal of Lasers, Volume. 50, Issue 16, 1602207(2023)

Effect of Continuous High-Power Laser Irradiation on Microstructure and Hardness of 55 Steel

Renren Yang1,2, Yinghua Lin1,2、*, Longsheng Peng3,4, Wei Huang3,4, and Xinlin Wang1,2
Author Affiliations
  • 1College of Mechanical Engineering, University of South China, Hengyang 421001, Hunan, China
  • 2Hunan Key Laboratory of Ultra-Fast Micro Technology and Advanced Laser Manufacturing, Hengyang 421001, Hunan, China
  • 3Hunan Lifang Roller Co., Ltd., Hengyang 421681, Hunan, China
  • 4Hunan High Wear Resistant Alloy Material Advanced Manufacturing Engineering Technology Research Center, Hengyang 421681, Hunan, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (13)
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    References (32)
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    Figures & Tables(13)
    Working principle diagram of laser hardening experiments

    Fig. 1. Working principle diagram of laser hardening experiments

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    Metallurgical structure and XRD profile of the matrix. (a) Metallurgical structure; (b) XRD profile

    Fig. 2. Metallurgical structure and XRD profile of the matrix. (a) Metallurgical structure; (b) XRD profile

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    Surface macroscopic morphology under different parameters. (a) Matrix surface; (b) 1.6 kW, 5 mm/s; (c) 1.7 kW, 5 mm/s; (d) 1.75 kW, 5 mm/s; (e) 1.8 kW, 5 mm/s; (f) 1.9 kW, 9 mm/s; (g) 2.0 kW, 9 mm/s; (h) 2.1 kW, 9 mm/s; (i) 2.2 kW, 9 mm/s; (j) 2.3 kW, 9 mm/s

    Fig. 3. Surface macroscopic morphology under different parameters. (a) Matrix surface; (b) 1.6 kW, 5 mm/s; (c) 1.7 kW, 5 mm/s; (d) 1.75 kW, 5 mm/s; (e) 1.8 kW, 5 mm/s; (f) 1.9 kW, 9 mm/s; (g) 2.0 kW, 9 mm/s; (h) 2.1 kW, 9 mm/s; (i) 2.2 kW, 9 mm/s; (j) 2.3 kW, 9 mm/s

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    Change of quenching surface width and macroscopic morphology of partial cross-sections under different parameters. (a) 1.6 kW, 5 mm/s; (b) 1.7 kW, 5 mm/s; (c) 1.75 kW, 5 mm/s; (d) 1.8 kW, 5 mm/s; (e) 1.9 kW, 9 mm/s; (f) 2.0 kW, 9 mm/s; (g) 2.1 kW, 9 mm/s; (h) 1.9 kW, cross-section; (i) 2.0 kW, cross-section; (j) 2.1 kW, cross-section

    Fig. 4. Change of quenching surface width and macroscopic morphology of partial cross-sections under different parameters. (a) 1.6 kW, 5 mm/s; (b) 1.7 kW, 5 mm/s; (c) 1.75 kW, 5 mm/s; (d) 1.8 kW, 5 mm/s; (e) 1.9 kW, 9 mm/s; (f) 2.0 kW, 9 mm/s; (g) 2.1 kW, 9 mm/s; (h) 1.9 kW, cross-section; (i) 2.0 kW, cross-section; (j) 2.1 kW, cross-section

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    Macroscopic appearance and EDS line scanning analysis of 2.1 kW remelted sample cross-section. (a) Macroscopic appearance of the sample cross-section; (b) remelting boundary; (c) dividing line of thermal impact zone; (d) element C distribution; (e) element Mn distribution; (f) element Cr distribution; (g) element Si distribution

    Fig. 5. Macroscopic appearance and EDS line scanning analysis of 2.1 kW remelted sample cross-section. (a) Macroscopic appearance of the sample cross-section; (b) remelting boundary; (c) dividing line of thermal impact zone; (d) element C distribution; (e) element Mn distribution; (f) element Cr distribution; (g) element Si distribution

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    Metallographic structure of the sample subsurface with medium power. (a) 1.9 kW, 9 mm/s; (b) 2.0 kW, 9 mm/s; (c) 2.1 kW, 9 mm/s

    Fig. 6. Metallographic structure of the sample subsurface with medium power. (a) 1.9 kW, 9 mm/s; (b) 2.0 kW, 9 mm/s; (c) 2.1 kW, 9 mm/s

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    SEM images of the middle of the intermediate power sample. (a)(b) 1.9 kW, 9 mm/s; (c)(d) 2.0 kW, 9 mm/s; (e)(f) 2.1 kW, 9 mm/s

    Fig. 7. SEM images of the middle of the intermediate power sample. (a)(b) 1.9 kW, 9 mm/s; (c)(d) 2.0 kW, 9 mm/s; (e)(f) 2.1 kW, 9 mm/s

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    XRD profiles of the next surface layer under different laser powers. (a) 1600-1800 W; (b) 1900-2100 W

    Fig. 8. XRD profiles of the next surface layer under different laser powers. (a) 1600-1800 W; (b) 1900-2100 W

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    Schematic diagram of hardness measurement points and mean hardness. (a) Schematic diagram of hardness measurement points; (b) average surface hardness

    Fig. 9. Schematic diagram of hardness measurement points and mean hardness. (a) Schematic diagram of hardness measurement points; (b) average surface hardness

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    Mean hardness of the cross-section hardened layer at medium power. (a) Mean hardness; (b) mean hardness of different areas of 2.1 kW sample cross-section

    Fig. 10. Mean hardness of the cross-section hardened layer at medium power. (a) Mean hardness; (b) mean hardness of different areas of 2.1 kW sample cross-section

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    Schematic diagrams of the hardening mechanism. (a) Schematic diagram of the microstructure before laser irradiation; (b) microstructure changes during the laser quenching; (c) microstructure changes during the laser remelting; (d) microstructure changes after cooling

    Fig. 11. Schematic diagrams of the hardening mechanism. (a) Schematic diagram of the microstructure before laser irradiation; (b) microstructure changes during the laser quenching; (c) microstructure changes during the laser remelting; (d) microstructure changes after cooling

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    • Table 1. Chemical composition of 55 steel

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      Table 1. Chemical composition of 55 steel

      ElementMass fraction/%
      C0.52-0.60
      Si0.17-0.37
      Mn0.50-0.80
      S≤0.035
      P≤0.035
      Cr≤0.25
      Ni≤0.30
      Cu≤0.25
      FeBal.

    • Table 2. Laser technological parameters

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      Table 2. Laser technological parameters

      Power bracketSerial numberLaser power /kWScanning speed /（mm·s-1）Surface shapeStatus
      Low power11.65Not melting
      21.75Not melting
      31.755Remelting
      41.85Remelting
      Middle power51.99Not melting
      62.09Remelting
      72.059Remelting
      82.19Remelting
      92.29Remelting
      102.39Remelting
      112.25Remelting
      122.27Remelting
      132.211Remelting
      142.213Not melting
      High power153.520Remelting
      163.518Remelting
      173.516Remelting
      183.514Remelting
      193.512Remelting
      203.510Remelting
      213.58Remelting
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    Renren Yang, Yinghua Lin, Longsheng Peng, Wei Huang, Xinlin Wang. Effect of Continuous High-Power Laser Irradiation on Microstructure and Hardness of 55 Steel[J]. Chinese Journal of Lasers, 2023, 50(16): 1602207

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    Paper Information

    Category: Laser Surface Machining

    Received: Oct. 14, 2022

    Accepted: May. 30, 2023

    Published Online: Aug. 9, 2023

    The Author Email: Yinghua Lin (lyh351258@163.com)

    DOI:10.3788/CJL221318

    Topics

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