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In this study, the 434 ferrite composite reinforced cladding layer was fabricated on the surface of Q235 steel through laser cladding technology. The evolution rule of the phase composition and morphology of the cladding layer under diverse laser processing parameters was investigated. Simultaneously, the hardness and corrosion resistance of the composite reinforced cladding layer fabricated under different processing parameters were examined. It is concluded that the matrix of the cladding layer is the Fe-chromium solid solution structure, and its composite strengthening phases mainly comprise Cr7C3, CrB, Fe2B, CrFeB, (CrFe)7C3 and Cr23C7, etc. The hardness of the composite reinforced cladding layer can reach 687HV, which is approximately three times that of 434L stainless steel. The corrosion resistance of the cladding layer is lower than that of 434L stainless steel. Under the same conditions, the corrosion resistance of the cladding layer is the optimal when the laser power is 2400W and the scanning speed is 5mm/s.

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Research on Microstructure and Properties of Composite Reinforced 434 Stainless Steel Coating Prepared by Laser Cladding Technology

  • 会议论文

  • 发表日期：

    2025年

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  • Dawei Xia,
  • Haitao Wang,
  • Siyu Wang

摘要

In this study, the 434 ferrite composite reinforced cladding layer was fabricated on the surface of Q235 steel through laser cladding technology. The evolution rule of the phase composition and morphology of the cladding layer under diverse laser processing parameters was investigated. Simultaneously, the hardness and corrosion resistance of the composite reinforced cladding layer fabricated under different processing parameters were examined. It is concluded that the matrix of the cladding layer is the Fe-chromium solid solution structure, and its composite strengthening phases mainly comprise Cr7C3, CrB, Fe2B, CrFeB, (CrFe)7C3 and Cr23C7, etc. The hardness of the composite reinforced cladding layer can reach 687HV, which is approximately three times that of 434L stainless steel. The corrosion resistance of the cladding layer is lower than that of 434L stainless steel. Under the same conditions, the corrosion resistance of the cladding layer is the optimal when the laser power is 2400W and the scanning speed is 5mm/s.