| 摘要: |
| 为修复某航空叶片损伤，应用CO2 激光器进行了GH710表面熔覆NiCrMoNb。分析了熔覆层金相组织，测试了熔覆层显微硬度及其在大气环境室温下的干滑动磨擦磨损性能。结果表明：熔覆层和基体呈现良好的冶金结合，白亮结合带宽度为10～20 μm；熔覆层组织由粗大疏松的柱状晶过渡为细小、致密的枝晶，在熔覆区最外层基本为网状晶格。柱状晶晶轴与熔合线接近垂直，其宽度能够达到8～12 μm，轴向长度达到50～60 μm。网状晶面积大约在2 μm×5 μm～4 μm×8 μm之间；熔覆层、结合带、基体硬度成明显的阶梯状分布。熔覆层显微硬度最高达到450 HV，比基体高出40%～50%；熔覆层的磨损量大约为基体磨损量的50%～55%,以磨粒磨损为主，黏着磨损为辅。 |
| 关键词: 激光熔覆 GH710 NiCrMoNb 摩擦磨损 |
| DOI： |
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| Microstructure and Wearresisting Property of NiCrMoNb Laser Cladding on GH710 |
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HU Bin, HU Fang-you, HUANG Xu-ren, CUI Ai-yong, LU Chang-liang, HUANG Jun-lei
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Qingdao Branch of Naval Aeronautical Engineering Institude, Qingdao Shandong 266041
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| Abstract: |
| Laser cladding on GH710 substrates using NiCrMoNb powders by CO2laser was carried out for the repair of aero blades. The microstructure and microhardness of cladding layers were investigated. The properties of dry sliding friction and wear in the air were tested. It was found that the clad layer was well combined with the substrate. The white narrow metallurgical bonding zone was about 10～20 μm; the microstructure transforms from coarse columnar grains to fine treelike grains from bottom to top and the netlike grains were fabricated on the surface. The axis of columnar grains is perpendicular to the direction of the melting line. Columnar grains has the scale of 8～12 μm on the width and 50～60 μm in the axis direction.The area of the crystal lattice varies from 2 μm×5 μm to 4 μm×8 μm. The microhardness of cladding, metallurgical bonding and substrate changes in a gradient. the microhardness is 450 HV, 40%～50% higher than that of the substrate, and the wearing capacity is 50%～55% of that of the substrate. The main form of abrasion is grainabrasion and adhesionabrasion. |
| Key words: laser cladding GH710 NiCrMoNb friction wear |
