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<p>This study investigates the strengthening and repair of 27SiMn steel via high-speed laser cladding using Fe60 and Fe5Z-1 alloys. The microstructures of the two types of cladding layers have similar evolutionary patterns, showing gradient transformation characteristics of planar crystals at the bottom, cellular crystals and columnar crystals in the middle, and equiaxial crystals at the top, with Fe5Z-1 showing denser, finer dendritic structures. The cladding layer is mainly composed of α-Fe solid solution and compounds Cr2B, (Fe,Ni), and (Fe,Cr,Ni). The mass fraction of the (Fe,Ni) phase in the Fe5Z-1-type cladding layer is significantly higher than that in the Fe60 type, which helps to improve its mechanical properties and corrosion resistance. Performance tests showed Fe60 and Fe5Z-1 increased hardness by 42% and 152.2%, respectively, and reduced friction coefficients by 0.112 and 0.169 versus the substrate. Wear mechanisms differed: Fe60 displayed adhesive wear, while Fe5Z-1 showed abrasive wear. The corrosion resistance grades of Fe5Z-1, Fe60, and the substrate were 9, 7, and 0, respectively. Corrosion tests demonstrated that the corrosion resistance of Fe5Z-1 was superior to that of Fe60 and the substrate. Electrochemical corrosion tests further confirmed that the corrosion rate of the base material was the fastest, while that of Fe5Z-1 was the slowest. By systematically comparing the comprehensive performance indicators of the two alloy coatings, the study determines that Fe5Z-1 powder has more excellent surface characteristics under optimized process conditions, and applies it to the actual repair works of hydraulic pillars, which is of important engineering application value for enhancing the service performance of mining machinery and equipment.</p>

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Comparative Study on the Microstructure and Properties of Different Fe-Based Alloy Materials by High-Speed Laser Cladding

  • 期刊论文

  • 发表日期：

    2026年2月8日

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  • Chuan Guo,
  • Aoxing Yang,
  • Xiaoqiang Xue,
  • Mingzhong Li,
  • Jingwang Yan,
  • Shubin Wang,
  • Dandan Wang,
  • Shirui Guo

摘要

This study investigates the strengthening and repair of 27SiMn steel via high-speed laser cladding using Fe60 and Fe5Z-1 alloys. The microstructures of the two types of cladding layers have similar evolutionary patterns, showing gradient transformation characteristics of planar crystals at the bottom, cellular crystals and columnar crystals in the middle, and equiaxial crystals at the top, with Fe5Z-1 showing denser, finer dendritic structures. The cladding layer is mainly composed of α-Fe solid solution and compounds Cr2B, (Fe,Ni), and (Fe,Cr,Ni). The mass fraction of the (Fe,Ni) phase in the Fe5Z-1-type cladding layer is significantly higher than that in the Fe60 type, which helps to improve its mechanical properties and corrosion resistance. Performance tests showed Fe60 and Fe5Z-1 increased hardness by 42% and 152.2%, respectively, and reduced friction coefficients by 0.112 and 0.169 versus the substrate. Wear mechanisms differed: Fe60 displayed adhesive wear, while Fe5Z-1 showed abrasive wear. The corrosion resistance grades of Fe5Z-1, Fe60, and the substrate were 9, 7, and 0, respectively. Corrosion tests demonstrated that the corrosion resistance of Fe5Z-1 was superior to that of Fe60 and the substrate. Electrochemical corrosion tests further confirmed that the corrosion rate of the base material was the fastest, while that of Fe5Z-1 was the slowest. By systematically comparing the comprehensive performance indicators of the two alloy coatings, the study determines that Fe5Z-1 powder has more excellent surface characteristics under optimized process conditions, and applies it to the actual repair works of hydraulic pillars, which is of important engineering application value for enhancing the service performance of mining machinery and equipment.