文章摘要
詹欢,李涛,邓林辉,石非凡.异质金属熔覆搭接率对Ni60A熔覆层显微组织影响[J].,2024,64(2):158-163
异质金属熔覆搭接率对Ni60A熔覆层显微组织影响
Effect of heterogeneous metal cladding overlap rate on microstructure of Ni60A cladding layer
  
DOI:10.7511/dllgxb202402006
中文关键词: 激光熔覆  Ni60A  多道搭接  物相成分  显微组织  显微硬度
英文关键词: laser cladding  Ni60A  multi-track overlapping  phase composition  microstructure  microhardness
基金项目:国家自然科学基金资助项目(51975099).
作者单位
詹欢,李涛,邓林辉,石非凡  
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中文摘要:
      利用半导体激光器在45钢基体上熔覆Ni60A材料来制作镍基合金涂层的实验方法,研究了熔覆层内部显微组织、物相成分及显微硬度随着搭接率的变化规律,根据实验结果选择合适的搭接率以满足性能要求.结果表明,在搭接率为20%、30%、40%及50%时,随着搭接率的增大,熔覆层搭接区底部组织晶粒逐渐增大,中上部组织晶粒逐渐减小;熔覆层主要物相为γ-Ni固溶体相,还有大量的铬硼化物、碳化物等硬质强化相,并且当搭接率从20%逐渐增大到30%时,主要物相成分逐渐增多,搭接率从30%增大到50%时主要物相成分有所减少;熔覆层的显微硬度变化规律大致与物相成分变化规律相同,同样是在搭接率从20%增大到30%时逐渐增大,在搭接率为20%时显微硬度最低,在搭接率为30%时显微硬度最大,为700 HV,随后当搭接率增大到50%时显微硬度降低至665 HV.根据熔覆层的性能要求,显微硬度要高,组织晶粒要细小均匀,在仅考虑搭接率的变化时,综合分析显微组织、物相成分及性能,选择30%搭接率为最佳.
英文摘要:
      The experimental method of using a semiconductor laser to melt Ni60A material on a 45 steel substrate to produce a nickel based alloy coating is adopted to study the internal microstructure, phase composition and microhardness of the cladding layer as a function of the overlap rate. Based on the experimental results, an appropriate overlap rate is selected to meet the performance requirements. The results show that when the overlap rates are 20%, 30%, 40% and 50%, with the increase of overlap rate, the structure grain at the bottom of the overlap zone in the cladding layer gradually increases, while the structure grain in the middle and upper parts gradually decreases. The main phases of the cladding layer are γ-Ni solid solution phase as well as a large amount of hard strengthening phases such as chromium borides and carbides, and when the overlap rate gradually increases from 20% to 30%, the main phase composition gradually increases, but decreases when it increases from 30% to 50%. The microhardness variation pattern of the cladding layer is roughly the same as that of the phase composition. It gradually increases as the overlap rate increases from 20% to 30%, with the lowest microhardness at 20% of overlap rate and the highest microhardness 700 HV at 30% of overlap rate. It then decreases to 665 HV when the overlap rate increases to 50%. According to the performance requirements of the cladding layer, it is required that the microhardness be high, and the structure grain be small and uniform. When only considering the changes in the overlap rate, a comprehensive analysis of the microstructure, phase composition and properties is conducted, and a 30% of overlap rate is selected as the best.
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