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<p>A novel Fe-based laser cladding coating with high hardness and excellent corrosion resistance was designed. Columnar dendrites which were consisted of fine martensite structure were dominated in the coating. The interdendritic regions were rich in Cr, Nb and Mo elements and were composed of a mixture of FeCr (σ) + Nb + FeNb + (Fe,Cr)<sub>2</sub>B phases. The microhardness of the coating was ranging from 580 to 630 HV0.3, which was much higher than that of the 27SiMn base metal (300 to 450 HV0.3). The hardness of individual structure was revealed by nanoindentation tests. The hardness of the dendrites which were consisted of fine martensite was ranging from 7.3-7.7 GPa. The interdendritic regions showed much higher hardness values (12.1-12.6&#xa0;GPa) due to the formation of FeCr (σ) + Nb + FeNb + (Fe,Cr)<sub>2</sub>B phases. Fine martensite structure with rod-like intermetallics dominated in the interdendritic regions contributed to the high hardness of the resulted coating. The laser cladding coating was survived from 300&#xa0;h neutral salt spray (NSS) corrosion tests without any macro pitting. Micropitting with the size of 1-5&#xa0;μm was observed on the coating surface, which was resulted from the microsegregation.</p>

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Laser Cladding of a Novel Fe-Based Coating with High Hardness and Excellent Corrosion Resistance

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Qiaoling Chu,
  • Junyao Wang,
  • Chengming Su,
  • Jie Li,
  • Renrun Mo,
  • Kai Cao,
  • Weiwei Xie,
  • Fuxue Yan

摘要

A novel Fe-based laser cladding coating with high hardness and excellent corrosion resistance was designed. Columnar dendrites which were consisted of fine martensite structure were dominated in the coating. The interdendritic regions were rich in Cr, Nb and Mo elements and were composed of a mixture of FeCr (σ) + Nb + FeNb + (Fe,Cr)2B phases. The microhardness of the coating was ranging from 580 to 630 HV0.3, which was much higher than that of the 27SiMn base metal (300 to 450 HV0.3). The hardness of individual structure was revealed by nanoindentation tests. The hardness of the dendrites which were consisted of fine martensite was ranging from 7.3-7.7 GPa. The interdendritic regions showed much higher hardness values (12.1-12.6 GPa) due to the formation of FeCr (σ) + Nb + FeNb + (Fe,Cr)2B phases. Fine martensite structure with rod-like intermetallics dominated in the interdendritic regions contributed to the high hardness of the resulted coating. The laser cladding coating was survived from 300 h neutral salt spray (NSS) corrosion tests without any macro pitting. Micropitting with the size of 1-5 μm was observed on the coating surface, which was resulted from the microsegregation.