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刘坤, 李亚江, 王娟, 马群双. 锆合金激光熔覆镍基复合层微观组织及界面特征[J]. 焊接学报, 2016, 37(11): 39-42.
引用本文: 刘坤, 李亚江, 王娟, 马群双. 锆合金激光熔覆镍基复合层微观组织及界面特征[J]. 焊接学报, 2016, 37(11): 39-42.
LIU Kun, LI Yajiang, WANG Juan, MA Qunshuang. Microstructure and interfacial characteristics of Ni-based composite coating on zirconium alloy substrate by laser cladding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(11): 39-42.
Citation: LIU Kun, LI Yajiang, WANG Juan, MA Qunshuang. Microstructure and interfacial characteristics of Ni-based composite coating on zirconium alloy substrate by laser cladding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(11): 39-42.

锆合金激光熔覆镍基复合层微观组织及界面特征

Microstructure and interfacial characteristics of Ni-based composite coating on zirconium alloy substrate by laser cladding

  • 摘要: 以Ni35自熔性合金粉末为熔覆材料,采用激光熔覆技术在锆合金表面原位生成了NiZr2/陶瓷增强镍基涂层.利用金相显微镜、扫描电镜、X射线衍射仪等对熔覆界面附近的微观组织、物相组成及界面结合特征进行分析.结果表明,熔覆层基体组织为NiZr+Ni10Zr7,增强相NiZr2以细针状均匀分布在熔覆层上部和底部,块状及棒状的陶瓷相Zr5(SixNi1-x4/Zr(SixNi1-x)分布在熔覆层中部,熔覆层与基体间实现良好的熔焊冶金结合,界面结合区组织不均匀,分布有等轴状NiZr及晶间的α-Zr,熔覆层的显微硬度分布均匀,平均值约为1 100 Hv.

     

    Abstract: The NiZr2/ceramic reinforced Ni-based composite coating was in-situ synthesized by laser cladding using Ni35 self-fluxing powder on zirconium alloy substrate. The microstructure, phase constituents and interfacial characteristics were investigated by optical microscope, scanning electron microscope and X-ray diffraction method. Results indicated that the matrix of coating was mainly composed of NiZr+Ni10Zr7, fine needles NiZr2 distributed at the top and the bottom, and blocky Zr5(SixNi1-x)4/Zr(SixNi1-x) ceramic phase in the middle of the coating. Good metallurgical bonding between substrate and coating was obtained. Heterogeneous microstructure of interface zone was mainly compromised of equiaxial NiZr phase and α-Zr at the grain boundary. The mean value of microhardness of the coating reached 1 100 HV.

     

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