中国机械工程

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激光熔覆Inconel718合金涂层与基体界面的组织及力学性能

方金祥1;王玉江2;董世运2;徐滨士2;闫世兴2;宋超群2,3舒凤远3;何鹏3   

  1. 1.贵州大学现代制造技术教育部重点实验室,贵阳,550025
    2.陆军装甲兵学院装备再制造技术国防科技重点实验室,北京,100072
    3.哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨,150001
  • 出版日期:2019-09-10 发布日期:2019-09-11
  • 基金资助:
    贵州省自然科学基金资助项目(黔科合基础[2018]1034);
    贵州省自然科学基金联合基金资助项目(黔科合LH字[2017]7233);
    贵州大学人才启动基金资助项目(贵大人基合字[2016]65);
    贵州省科技计划资助项目(黔科合平台人才[2017]5788)

Microstructure and Mechanics Properties of Interfaces between Laser Cladded Inconel718 Coating and Substrate

FANG Jinxiang1;WANG Yujiang2;DONG Shiyun2;XU Binshi2;YAN Shixing2;SONG Chaoqun2,3;SHU Fengyuan3;HE Peng3   

  1. 1.Key Laboratory of Advanced Manufacturing Technology of the Ministry of Education,Guizhou University,Guiyang,550025
    2.National Key Laboratory for Remanufacturing,Academy of Army Armored Forces,Beijing,100072
    3.State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,150001
  • Online:2019-09-10 Published:2019-09-11

摘要: 研究了激光熔覆Inconel718合金涂层与基体界面的微观组织及力学性能,结果表明:由于强化相的溶解,热影响区的硬度及强度降低,典型激光熔覆工艺条件下,扫描速度越快,热影响区越窄;熔覆层底部无平面晶组织,熔合区结合致密,化学成分一致,组织过渡平滑,熔覆层内部为枝晶组织,晶间有较多的Laves相,硬度较热影响区高;时效热处理后,热影响区及熔覆层的强度接近原始基材,界面区域力学性能过渡的平滑性改善。

关键词: 激光熔覆, 热影响区, 界面, Inconel718合金

Abstract: An Inconel718 coating was fabricated on the surfaces of Inconel 718 alloy by laser cladding, and the microstructure and mechanics properties in the zones of bonding interfaces were investigated. The results demonstrate that the hardness and strength decrease in the HAZ due to the dissolution of the strengthening phase. Under typical processing conditions, the HAZ decrease with the increasing scanning speeds. There is no planar crystal structures at the bottoms of cladding layers. Furthermore, the structures in the fusion zones were densified and presented smooth transition, the chemical components are consistent with those of the substrate. In the cladding layers, the microstructure consists of an dendritic structure and lots of  intergranular Laves phases. The hardness in the cladding layers is higher compared to the HAZ. After the aging heat treatment, the strength in both of HAZs and cladding layers are improved, and are close to that of the substrate materials, and a smooth mechanics properties transition are obtained in the interface zones between the coatings and substrates.

Key words: laser cladding, heat affected zone(HAZ), interface, Inconel718 alloy

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