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Laser & Optoelectronics Progress, Volume. 60, Issue 23, 2314002(2023)

Effect of Continuous Laser Cleaning Process Parameters on Surface Quality of Q235B Carbon Steel Rust Layer

Qiupei Wu, Xiangyang Sun, Jiapo Sun, Lianghua Han, and Lie Liu*
Author Affiliations
  • School of Mechanical Engineering, University of South China, Hengyang 421001, Hunan, China
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    Figures&Tables (21)
    Equations (11)
    References (25)
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    Figures & Tables(21)
    Laser cleaning experimental setup

    Fig. 1. Laser cleaning experimental setup

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    Rust sample. (a) Rusted surface; (b) microtopography diagram; (c) microscopic diagram of section of rust layer

    Fig. 2. Rust sample. (a) Rusted surface; (b) microtopography diagram; (c) microscopic diagram of section of rust layer

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    Macroscopic topography of cleaned samples under different laser powers and cleaning speeds. (a) 2 kW, 100 mm·s-1; (b) 3 kW, 100 mm·s-1; (c) 4 kW, 100 mm·s-1; (d) 5 kW, 100 mm·s-1; (e) 7 kW, 100 mm·s-1; (f) 7 kW, 100 mm·s-1; (g) 7 kW, 200 mm·s-1; (h) 7 kW, 300 mm·s-1; (i) 7 kW, 400 mm·s-1; (j) 7 kW, 500 mm·s-1

    Fig. 3. Macroscopic topography of cleaned samples under different laser powers and cleaning speeds. (a) 2 kW, 100 mm·s-1; (b) 3 kW, 100 mm·s-1; (c) 4 kW, 100 mm·s-1; (d) 5 kW, 100 mm·s-1; (e) 7 kW, 100 mm·s-1; (f) 7 kW, 100 mm·s-1; (g) 7 kW, 200 mm·s-1; (h) 7 kW, 300 mm·s-1; (i) 7 kW, 400 mm·s-1; (j) 7 kW, 500 mm·s-1

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    SEM images of sample surface after cleaning with different laser powers and cleaning speeds. (a) 2 kW, 100 mm·s-1; (b) 3 kW, 100 mm·s-1; (c) 4 kW, 100 mm·s-1; (d) 5 kW, 100 mm·s-1; (e) 7 kW, 100 mm·s-1; (f) 7 kW, 200 mm·s-1; (g) 7 kW, 300 mm·s-1; (h) 7 kW, 400 mm·s-1; (i) 7 kW, 500 mm·s-1

    Fig. 4. SEM images of sample surface after cleaning with different laser powers and cleaning speeds. (a) 2 kW, 100 mm·s-1; (b) 3 kW, 100 mm·s-1; (c) 4 kW, 100 mm·s-1; (d) 5 kW, 100 mm·s-1; (e) 7 kW, 100 mm·s-1; (f) 7 kW, 200 mm·s-1; (g) 7 kW, 300 mm·s-1; (h) 7 kW, 400 mm·s-1; (i) 7 kW, 500 mm·s-1

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    Roughness of sample surface after cleaning. (a) Different powers at a constant speed of 100 mm·s-1; (b) different speeds at a constant power of 7 kW

    Fig. 5. Roughness of sample surface after cleaning. (a) Different powers at a constant speed of 100 mm·s-1; (b) different speeds at a constant power of 7 kW

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    Three-dimensional morphology of cleaned specimens under different process parameters. (a) Unclean; (b) 100 mm·s-1, 4 kW; (c) 100 mm·s-1, 7 kW; (d) 400 mm·s-1, 7 kW

    Fig. 6. Three-dimensional morphology of cleaned specimens under different process parameters. (a) Unclean; (b) 100 mm·s-1, 4 kW; (c) 100 mm·s-1, 7 kW; (d) 400 mm·s-1, 7 kW

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    Schematic diagram of formation of remelted layer on surface of steel during laser cleaning

    Fig. 7. Schematic diagram of formation of remelted layer on surface of steel during laser cleaning

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    Cross-sectional topography of cleaned samples under different process parameters. (a) 100 mm·s-1, 3 kW; (b) 100 mm·s-1, 4 kW; (c) 100 mm·s-1, 7 kW; (d) 400 mm·s-1, 7 kW

    Fig. 8. Cross-sectional topography of cleaned samples under different process parameters. (a) 100 mm·s-1, 3 kW; (b) 100 mm·s-1, 4 kW; (c) 100 mm·s-1, 7 kW; (d) 400 mm·s-1, 7 kW

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    Elemental content on sample surface after cleaning. (a) Different powers at a constant speed of 100 mm·s-1; (b) different speeds at a constant power of 7 kW

    Fig. 9. Elemental content on sample surface after cleaning. (a) Different powers at a constant speed of 100 mm·s-1; (b) different speeds at a constant power of 7 kW

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    XRD of sample surface after cleaning. (a) Different powers at a constant speed of 100 mm·s-1; (b) different speeds at a constant power of 7 kW

    Fig. 10. XRD of sample surface after cleaning. (a) Different powers at a constant speed of 100 mm·s-1; (b) different speeds at a constant power of 7 kW

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    Surface hardness of sample after cleaning. (a) Different powers at a constant speed of 100 mm·s-1; (b) different speeds at a constant power of 7 kW

    Fig. 11. Surface hardness of sample after cleaning. (a) Different powers at a constant speed of 100 mm·s-1; (b) different speeds at a constant power of 7 kW

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    Sample surface kinetic potential polarization curve after cleaning. (a) Different powers at a constant speed of 100 mm·s-1; (b) different speeds at a constant power of 7 kW

    Fig. 12. Sample surface kinetic potential polarization curve after cleaning. (a) Different powers at a constant speed of 100 mm·s-1; (b) different speeds at a constant power of 7 kW

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    Geometric modeling and meshing

    Fig. 13. Geometric modeling and meshing

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    Temperature cloud map at a speed of 100 mm·s-1 and a power of 3 kW when irradiated with a laser for 0.1 s. (a) Front; (b) cross-section

    Fig. 14. Temperature cloud map at a speed of 100 mm·s-1 and a power of 3 kW when irradiated with a laser for 0.1 s. (a) Front; (b) cross-section

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    Probe temperature changes at different powers when speed is 100 mm·s-1. (a) Front; (b) interface

    Fig. 15. Probe temperature changes at different powers when speed is 100 mm·s-1. (a) Front; (b) interface

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    Probe temperature changes at different speeds when laser power is 7 kW. (a) Front; (b) interface

    Fig. 16. Probe temperature changes at different speeds when laser power is 7 kW. (a) Front; (b) interface

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    Temperature curve changes on straight line (Z=0‒5.05 mm) and simulation and experimental comparison of substrate remelting depth under different laser process parameters. (a), (b) Different powers at a constant speed of 100 mm·s-1; (c), (d) different speeds at a constant power of 7 kW

    Fig. 17. Temperature curve changes on straight line (Z=0‒5.05 mm) and simulation and experimental comparison of substrate remelting depth under different laser process parameters. (a), (b) Different powers at a constant speed of 100 mm·s-1; (c), (d) different speeds at a constant power of 7 kW

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    • Table 1. Main chemical composition of Q235B steel (mass fraction)

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      Table 1. Main chemical composition of Q235B steel (mass fraction)

      CSiMnPS
      ≤0.20≤0.35≤1.40≤0.06≤0.05

    • Table 2. Laser cleaning process parameters

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      Table 2. Laser cleaning process parameters

      Laser power /kW234577777
      Cleaning speed /（mm·s-1）100100100100100200300400500
      Spot size /（mm×mm）15×1

    • Table 3. Corresponding parameters of kinetic potential polarization curve under different laser cleaning process parameters

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      Table 3. Corresponding parameters of kinetic potential polarization curve under different laser cleaning process parameters

      Power /kWSpeed /（mm·s-1）Ecorr /VIcorr /（A·cm-2）
      Uncleaned sample-1.098.86×10-5
      2100-0.891.46×10-5
      3100-0.871.52×10-5
      4100-0.805.60×10-6
      5100-0.676.74×10-6
      7100-0.713.56×10-6
      7200-0.591.28×10-5
      7300-0.896.97×10-6
      7400-0.825.20×10-6
      7500-0.937.87×10-4

    • Table 4. Main thermophysical parameters of Q235B steel plate substrate and rust layer[22]

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      Table 4. Main thermophysical parameters of Q235B steel plate substrate and rust layer[22]

      Thermophysical parameterCarbon steelRust layer
      Destiny ρ/(kg∙m-3)78605200
      Thermal conductivity k /(W∙m-1∙K-1)44.54.3
      Constant pressure heat capacityCP /(J∙kg-1∙K-1)600900
      Reflection ratio0.510.20
      Absorption ratio0.490.80
      Melting temperature Tm /K18081773
      Vaporization temperature Tv /K31332973
      Latent heat of vaporization Lv /(kJ∙kg-1)60714300
      Boiling temperature Tb /K26332633
      Molar mass M /mol5656
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    Qiupei Wu, Xiangyang Sun, Jiapo Sun, Lianghua Han, Lie Liu. Effect of Continuous Laser Cleaning Process Parameters on Surface Quality of Q235B Carbon Steel Rust Layer[J]. Laser & Optoelectronics Progress, 2023, 60(23): 2314002

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    Paper Information

    Category: Lasers and Laser Optics

    Received: Oct. 31, 2022

    Accepted: Dec. 27, 2022

    Published Online: Dec. 8, 2023

    The Author Email: Lie Liu (Reseek206@163.com)

    DOI:10.3788/LOP222926

    Topics

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