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 2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制,阐明了单晶修复技术在航空领域的应用潜力.此外,还讨论了目前单晶叶片修复面临的主要挑战,并对其未来发展趋势进行了展望.
Research Progress in Laser Repair of Single Crystal Blades
The single crystal blade laser repair technology reduces considerable cost in the aviation field.Based on the additive manufacturing process,the technology grows an ideal single crystal structure through directional solidification on the single crystal substrate.At present,the mainstream single crystal blade repair technology includes two categories:directed energy deposition(DED),and powder bed fusion(PBF).In this paper,the research progress of the main repair technologies was reviewed,the influence of process parameters and the mechanism of single crystal growth in the repair process were summarized,and the application potential of single crystal repair technology in the aerospace field was clarified.In addition,this paper also discussed the main challenges currently faced by single crystal blade repair and its future development.
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