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Chinese Journal of Lasers, Volume. 46, Issue 10, 1002010(2019)

Comparison of Microstructure and Corrosion Resistance of 431 Stainless Steel Coatings Prepared by Extreme High-Speed Laser Cladding and Conventional Laser Cladding

Liqun Li1、*, Faming Shen1, Yuandong Zhou1, Wang Tao1, Wei Wang2, and Shuliang Wang2
Author Affiliations
  • 1State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology,Harbin, Heilongjiang 150001, China
  • 2ACunity (Tianjin) Co., Ltd., Tianjin 300457, China
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    AbstractGet PDF(in Chinese)
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    References (26)
    Cited By (10)
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    Figures & Tables(14)
    Principles of two laser claddings. (a) EHLA; (b) CLA

    Fig. 1. Principles of two laser claddings. (a) EHLA; (b) CLA

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    Macroscopic morphologies of single-layer stainless steel coating prepared by two methods. (a) EHLA; (b) CLA

    Fig. 2. Macroscopic morphologies of single-layer stainless steel coating prepared by two methods. (a) EHLA; (b) CLA

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    Molten pool morphologies of EHLA and CLA. (a) EHLA; (b) CLA

    Fig. 3. Molten pool morphologies of EHLA and CLA. (a) EHLA; (b) CLA

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    Morphologies of single-layer multi-lap coatings by EHLA. (a) Macroscopic morphology of coating; (b) micro-morphology of surface of coating (zone A); (c) micro-morphology of middle part of coating (zone B); (d) micro-morphology of coating/substrate interface (zone C)

    Fig. 4. Morphologies of single-layer multi-lap coatings by EHLA. (a) Macroscopic morphology of coating; (b) micro-morphology of surface of coating (zone A); (c) micro-morphology of middle part of coating (zone B); (d) micro-morphology of coating/substrate interface (zone C)

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    Morphologies of single-layer multi-lap coatings by CLA. (a) Macroscopic morphology of coating; (b) micro-morphology of surface of coating (zone A); (c) micro-morphology of middle part of coating (zone B); (d) micro-morphology of coating/substrate interface (zone C)

    Fig. 5. Morphologies of single-layer multi-lap coatings by CLA. (a) Macroscopic morphology of coating; (b) micro-morphology of surface of coating (zone A); (c) micro-morphology of middle part of coating (zone B); (d) micro-morphology of coating/substrate interface (zone C)

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    Comparison of microstructures of coatings prepared by EHLA and CLA. (a) Top microstructure of coating prepared by EHLA; (b) cross-sectional microstructure of coating prepared by EHLA; (c) top microstructure of coating prepared by CLA; (d) cross-sectional microstructure of coating prepared by CLA

    Fig. 6. Comparison of microstructures of coatings prepared by EHLA and CLA. (a) Top microstructure of coating prepared by EHLA; (b) cross-sectional microstructure of coating prepared by EHLA; (c) top microstructure of coating prepared by CLA; (d) cross-sectional microstructure of coating prepared by CLA

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    Elemental distributions of coatings. (a) Coating prepared by EHLA; (b) coating prepared by CLA

    Fig. 7. Elemental distributions of coatings. (a) Coating prepared by EHLA; (b) coating prepared by CLA

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    Hardness distribution of coating

    Fig. 8. Hardness distribution of coating

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    XRD analyses for surfaces of coatings prepared by EHLA and CLA

    Fig. 9. XRD analyses for surfaces of coatings prepared by EHLA and CLA

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    Polarization curves of substrate and coatings prepared by EHLA and CLA in 3.5% NaCl solution

    Fig. 10. Polarization curves of substrate and coatings prepared by EHLA and CLA in 3.5% NaCl solution

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    Microstructures of dendrites in coatings. (a) Coating prepared by EHLA; (b) coating prepared by CLA

    Fig. 11. Microstructures of dendrites in coatings. (a) Coating prepared by EHLA; (b) coating prepared by CLA

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    • Table 1. Chemical composition of 27SiMn steel and 431 stainless steel powder (atomic number fraction, %)

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      Table 1. Chemical composition of 27SiMn steel and 431 stainless steel powder (atomic number fraction, %)

      MaterialCSiMnCrFeNi
      27SiMn3.372.091.700.4791.780.58
      431 powder0.021.76-19.1275.631.96

    • Table 2. Corrosion potentials and current densities of substrate and coatings prepared by EHLA and CLA

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      Table 2. Corrosion potentials and current densities of substrate and coatings prepared by EHLA and CLA

      SampleCorrosion potentialEcorr /VCorrosion currentdensity Icorr /(μA·cm-2)
      EHLA-0.2320.324
      CLA-0.59819.001
      Substrate-0.75412.235

    • Table 3. Difference in chemical composition inside and between dendrites for coatings prepared by EHLA and CLA

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      Table 3. Difference in chemical composition inside and between dendrites for coatings prepared by EHLA and CLA

      CoatingPositionAtomic numberfraction of Cr /%
      EHLA coatinga19.78
      b20.17
      CLA coatingc12.78
      d15.19
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    Liqun Li, Faming Shen, Yuandong Zhou, Wang Tao, Wei Wang, Shuliang Wang. Comparison of Microstructure and Corrosion Resistance of 431 Stainless Steel Coatings Prepared by Extreme High-Speed Laser Cladding and Conventional Laser Cladding[J]. Chinese Journal of Lasers, 2019, 46(10): 1002010

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    Paper Information

    Category: laser manufacturing

    Received: Apr. 30, 2019

    Accepted: Jun. 13, 2019

    Published Online: Oct. 25, 2019

    The Author Email: Li Liqun (liliqun@hit.edu.cn)

    DOI:10.3788/CJL201946.1002010

    Topics

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