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Monel合金表面激光熔覆Ni基稀土合金空蚀性能
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沈阳工业大学,沈阳工业大学,沈阳工业大学,沈阳工业大学,沈阳工业大学,沈阳鼓风机集团核电泵业有限公司,沈阳鼓风机集团核电泵业有限公司,沈阳鼓风机集团核电泵业有限公司

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TG178

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国家自然科学基金资助(项目号51271126);国家重点研发计划(2016YFB1100204);沈阳市科技局计划项目(F16-032-0-00)


Cavitation erosion properties of Ni-based RE alloy coating on Monel alloy by laser cladding
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Shenyang University of Technology,,Shenyang University of Technology,Shenyang University of Technology,Shenyang University of Technology,Nuclear Power Pump Industry Co Ltd,Shenyang Blower Works Group Corporation,Nuclear Power Pump Industry Co Ltd,Shenyang Blower Works Group Corporation,Nuclear Power Pump Industry Co Ltd,Shenyang Blower Works Group Corporation

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    摘要:

    采用激光熔覆技术在Monel400合金表面制备Ni基稀土合金熔覆层。利用SEM、EDS、XRD、显微硬度计及超声波金属材料空蚀仪等设备对熔覆层的组织形貌、相结构、硬度、空蚀性能及失效机制进行了系统研究。结果表明:Y2O3细化了熔覆层的组织,其组织主要由γ-Ni固溶体、Ni3B和高硬度的Cr23C6和Cr7C3组成,平均硬度可达886 HV,抗空蚀性能是Monel400合金的8倍,熔覆层的失效机制均为枝晶干的冲蚀剥落,细晶强化及空蚀过程中产生的阻断晶界的网状结构是提高熔覆层耐空蚀性能的关键。

    Abstract:

    Ni-base RE cladding layer was prepared on Monel 400 alloy by Laser cladding technology. The microstructure, chemical composition, phase identification, hardness distribution, cavitation erosion resistance and failure mechanisms of the modified layer were examined by using SEM, EDS, XRD, microhardness tester and ultrasonic cavitation erosion tester, respectively. The results show that the Y2O3 can refine the grain. The cladding layer was mainly composed of γ-Ni solid solution, Ni3B and the high-hardness carbides (Cr23C6 and Cr7C3). The average hardness of the modified layer can reach 886 HV. The cavitation erosion resistance of Ni-based RE cladding layer was increased by 8 times compared to the Monel 400 alloy. The failure mechanism of the cladding layers is the erosion peeling of the dendrite. Grain refinement strengthening and the net structure blocking grain boundary are the key to improving the cavitation corrosion resistance of the cladding layer.

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张春华,武世奇,何斯文,张松,吴臣亮,关锰,谭俊哲,崔文东. Monel合金表面激光熔覆Ni基稀土合金空蚀性能[J].稀有金属材料与工程,2018,47(5):1517~1522.[Zhang Chunhua, Wu SHIqi, He Siwen, Zhang Song, WuChenliang, Guan Meng, Tan Junzhe, Cui Wendong. Cavitation erosion properties of Ni-based RE alloy coating on Monel alloy by laser cladding[J]. Rare Metal Materials and Engineering,2018,47(5):1517~1522.]
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  • 收稿日期:2016-07-05
  • 最后修改日期:2017-04-19
  • 录用日期:2017-05-15
  • 在线发布日期: 2018-06-08
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