单晶叶片激光修复研究进展

Research Progress in Laser Repair of Single Crystal Blades

摘要:

单晶叶片激光修复技术为航空领域节约了大量成本，该技术以增材制造工艺为基础，以期在单晶基底上通过定向凝固生长出理想的单晶结构。目前，主流的单晶叶片修复技术包括以下两类：定向能量沉积技术（Directed Energy Deposition，DED）、粉末床熔融技术（Powder Bed Fusion，PBF）。本文综述了两种主要修复技术的研究进展，总结了修复过程中工艺参数的影响及单晶生长的机理，阐明了单晶修复技术在航空领域的应用潜力。此外，本文还讨论了单晶叶片修复目前面临的主要挑战，并对其未来发展趋势进行展望。

Abstract:

The single crystal blade laser repair technology reduced considerable cost in the aviation field. This technology is based on the additive manufacturing process, in order to grow an ideal single crystal structure through directional solidification on the single crystal substrate. At present, the mainstream single crystal blade repair technology includes the following two categories: Directed Energy Deposition (DED), Powder Bed Fusion (PBF). In this paper, the research progress of two main repair technologies is reviewed, the influence of process parameters and the mechanism of single crystal growth in the repair process are summarized, and the application potential of single crystal repair technology in the aerospace field is clarified. In addition, this paper also discusses the main challenges currently faced by single crystal blade repair then looks forward to its future development trend.