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兵工学报 ›› 2021, Vol. 42 ›› Issue (7): 1524-1534.doi: 10.3969/j.issn.1000-1093.2021.07.020

• 论文 • 上一篇    下一篇

激光工艺参数对NiCoCrAlYSi熔覆层微观组织及性能的影响

沈浩1, 蔡杰2, 吕鹏1, 张从林3, 李玉新4, 关庆丰1   

  1. (1.江苏大学 材料科学与工程学院, 江苏 镇江 212013; 2.江苏大学 先进制造与现代装备技术工程研究院, 江苏 镇江 212013;3.盐城工学院 材料科学与工程学院, 江苏 盐城 224051; 4.中北大学 材料科学与工程学院, 山西 太原 030051)
  • 上线日期:2021-07-30
  • 作者简介:沈浩(1996—),男,硕士研究生。E-mail:1757812239@qq.com
  • 基金资助:
    国家自然科学基金项目(U1933124、U1810112);江苏大学青年英才培育计划项目(2016年)

Effect of Laser Process Parameters on Microstructures and Properties of NiCoCrAlYSi Laser Cladding Coating

SHEN Hao1, CAI Jie2, L Peng1, ZHANG Conglin3, LI Yuxin4, GUAN Qingfeng1   

  1. (1.School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;2.Engineering Institute of Advanced Manufacturing and Modern Equipment Technology, Jiangsu University, Zhenjiang 212013, Jiangsu, China;3. School of Materials Science and Engineering, Yancheng Insititute of Technology, Yancheng 224051, Jiangsu, China;4. School of Materials Science and Engineering, North University of China, Taiyuan 030051, Shanxi, China)
  • Online:2021-07-30

摘要: 采用激光熔覆技术在Ni625高温合金表面制备NiCoCrAlYSi涂层,研究激光功率和扫描速度对NiCoCrAlYSi熔覆层冶金质量及微观组织的影响。通过测试熔覆层显微硬度及摩擦磨损性能,建立激光熔覆工艺参数、微观组织与熔覆层性能之间的关系。结果表明:随着激光输入能量从36 J/mm2升高至73.3 J/mm2,熔覆层厚度从534 μm增加到1 535 μm,表面气孔率从0.07%增大到0.65%,以及平均气孔尺寸从0.23 μm增大到1.33 μm,且熔覆层微观组织发生粗化,熔覆层表面气孔率的增大及组织粗化导致其显微硬度和耐磨性逐渐降低;当激光输入能量比为36 J/mm2时,熔覆层组织致密性最高、晶粒尺寸最细小,且内部分布有大量的位错及位错墙结构,此时熔覆层硬度及耐磨性也最佳。

关键词: Ni625高温合金, 激光熔覆, 扫描速度, 激光功率, 微观组织, 显微硬度, 摩擦磨损性能

Abstract: NiCoCrAlYSi coating was fabricated on Ni625 superalloy by laser cladding technique, and the influences of laser power and scanning speed on the metallurgical quality and microstructure of NiCoCrAlYSi cladding coating were researched. The relationship among the laser cladding process parameters, and the microstructures and properties of cladding coating was analyzed by testing its micro-hardness, and friction and wear properties. The results show that, with the increase in laser input energy from 36 J/mm2 to 73.3 J/mm2, the thickness of cladding layer increases from 534 μm to 1 535 μm, the surface porosity increases from 0.07% to 0.65%, and the pore size increases from 0.23 μm to 1.33 μm. In addition, the grain size of cladding layer increases. The microhardness and wear resistance of the cladding layer decrease gradually with the increase in porosity and grain size. When the laser input energy ratio is 36 J/mm2, a cladding coating with high compactness, supper refined grains and high density of dislocations is obtained, which has optimal microhardness and wear resistance.

Key words: Ni625superalloy, lasercladding, scanningspeed, laserpower, microstructure, microhardness, frictionandwearproperty

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