Laser & Optoelectronics Progress, Volume. 57, Issue 1, 011404(2020)

Microstructure and Corrosion Behavior of Ultra-High Strength Steel 300M After Laser Surface Remelting

Wei Xu1,2、*, Xiaoguang Wang3、**, and Zhengxing Men1、***
Author Affiliations
  • 1College of General Aviation, Chengdu Aeronautic Polytechnic, Chengdu, Sichuan 610100, China
  • 2The Innovation Base of School-Enterprise Cooperation Aviation Electroic Technology in Sichuan, Chengdu, Sichuan 610100, China
  • 3Clllege of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang, Jiangxi 330063, China
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    Figures & Tables(11)
    Microstructure of 300M steel used in test
    Energy density distribution of Gaussian heat source and surface morphologies of laser remelting layer. (a) Energy density distribution of Gaussian heat source; (b) macro morphology; (c) micro morphology of x-y cross section when P=600 W and S=66 mm/s ; (d) micro morphology of x-y cross section of remelting layer when P=300 W and S=33 mm/s; (e) micro morphology of y-z cross section of remelting layer when P=600 W and S=66 mm/s; (f) mi
    Microstructures of different regions of laser remelting layer in x-y direction for different parameters. (a) P=300 W, S=33 mm/s, weld zone; (b) P=300 W, S=33 mm/s, weld remelting zone; (c) P=600 W, S=66 mm/s, weld zone; (d) P=600 W, S=66 mm/s, weld remelting zone
    CCT curves of 300M steel
    Microhardness contour maps of laser remelting layer for different parameters. (a) P=600 W, S=66 mm/s; (b) P=300 W, S=33 mm/s
    Polarization plots of substrate and remelted samples in 3.5% NaCl solution
    Electrochemical impedance spectra ofsubstrate and remelted samples in 3.5% NaCl solution. (a) Nyquist plots; (b) Bode plots (impedance); (c) Bode plots (phase angle)
    Equivalent circuit of 300M steel in 3.5%NaCl solution
    • Table 1. Parameters for laser surface remelting

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      Table 1. Parameters for laser surface remelting

      NumberPower P /WSpeed S /(mm·s-1)
      130033
      260066
    • Table 2. Polarization curve fitting results of substrate and remelted samples in 3.5%NaCl solution under different processes

      View table

      Table 2. Polarization curve fitting results of substrate and remelted samples in 3.5%NaCl solution under different processes

      SampleEcorr /mVicorr /(μA·cm-2)βa /(mV·dec-1)βc /(mV·dec-1)
      Substrate sample-518.2010.8679.718.2
      Remelted sample (P=300 W, S=33 mm·s-1)-505.3780.5297.120.1
      Remelted sample (P=600 W, S=66 mm·s-1)-506.8160.8176.323.2
    • Table 3. EIS fitting results of substrate and remelted samples in 3.5% NaCl solution

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      Table 3. EIS fitting results of substrate and remelted samples in 3.5% NaCl solution

      SampleRs /(Ω·cm2)Q /(Ω-1·cm-2·s)nctRct /(Ω·cm2)
      Substrate sample20.122.69×10-40.63518.60
      Remelted sample (P=300 W, S=33 mm·s-1)16.703.96×10-40.707245
      Remelted sample (P=600 W, S=66 mm·s-1)17.182.63×10-40.694971
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    Wei Xu, Xiaoguang Wang, Zhengxing Men. Microstructure and Corrosion Behavior of Ultra-High Strength Steel 300M After Laser Surface Remelting[J]. Laser & Optoelectronics Progress, 2020, 57(1): 011404

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    Paper Information

    Category: Lasers and Laser Optics

    Received: Jun. 1, 2019

    Accepted: Jul. 10, 2019

    Published Online: Jan. 3, 2020

    The Author Email: Xu Wei (354395583@qq.com), Wang Xiaoguang (quantumbit@foxmail.com), Men Zhengxing (25773211@qq.com)

    DOI:10.3788/LOP57.011404

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