| 引用本文: | 戎 磊a,b，黄 坚a,b，李铸国a,b，李瑞峰a,b.激光熔覆WC颗粒增强Ni基合金涂层的组织与性能[J].中国表面工程,2010,(6):40~44 |
| RONG Leia,b, HUANG Jiana,b, LI Zhu?guoa,b, LI Rui?fenga,b.Microstructure and Property of Laser Cladding Ni?based Alloy Coating Reinforced by WC Particles[J].China Surface Engineering,2010,(6):40~44 |
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| 摘要: |
| 利用15 kW横流连续输出CO2激光器在CCS?B钢板上熔覆WC颗粒增强Ni基合金涂层，研究了不同WC颗粒含量下熔覆层组织形态和显微硬度的变化规律。结果表明，在激光熔覆Ni基合金与WC颗粒混合粉末的过程中，WC颗粒发生溶解并与周围元素相互作用形成低熔点共晶，析出后分别以树枝状、块状与粒状等形态存在；随着WC含量增加，熔覆层上部区域γ?Ni枝晶先粗化后变细，熔覆层下部区域枝晶组织持续增多且粗化。随WC含量增加，熔覆层平均硬度增加，WC质量分数为0 %时，熔覆层平均硬度约为基体的3倍，当WC质量分数增加到30 %时，熔覆层平均硬度可达到基体硬度的4倍。 |
| 关键词: 激光熔覆 Ni基合金 WC颗粒 微观组织 硬度 |
| DOI： |
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| 基金项目:科技部国际科技合作基金项目（2009DFB50350） |
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| Microstructure and Property of Laser Cladding Ni?based Alloy Coating Reinforced by WC Particles |
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RONG Leia,b, HUANG Jiana,b, LI Zhu?guoa,b, LI Rui?fenga,b
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a. Shanghai Key Laboratory of Materials Laser Processing and Modification b. School of Material Science and Engineering, Shanghai Jiao Tong University
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| Abstract: |
| The 15kW continuous wave CO2 laser has been used for cladding WC reinforced Ni?base alloy to steel CCS?B. The effect of WC weight percent on microstructure and microhardness of laser cladding layers was studied. The results show that in the process of laser cladding the mixture of WC particles and Ni?based alloy powder, WC particles dissolve and react with surrounding elements to form low melting point eutectics, which exist in the shape of branch, block and grain. With the increasing of WC content, γ?Ni dendrites in the upper zone of cladding layers first coarsen then refine, which coarsen steadily in the lower zone of cladding layers. At the same time, the average hardness of cladding layers increases, which is about three times that of the matrix when weight percent of WC is 0 %, while it can be four times that of the matrix when weight percent of WC is 30 %. |
| Key words: laser cladding Ni?base alloy WC particle microstructure hardness |
