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电火花加工气膜冷却孔重熔层的研究进展
Research Progress on the Recast Layer of a Cooling Hole by Electro-Discharge Machine
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- DOI:
- 作者:
- 刘 露 1 ，杨泽南 2 ，李俊杰 1 ，王志军 1
LIU Lu1 , YANG Zenan2 , LI Junjie1 , WANG Zhijun1
- 作者单位:
- 1. 西北工业大学 凝固技术国家重点实验室，陕西 西安 710072；2. 中国航发北京航空材料研究院 先进高温结构材料重 点实验室，北京 100095
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 2. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
- 关键词:
- 涡轮叶片；气膜冷却孔；电火花加工；重熔层
turbine blades; film cooling holes; electrodischarge machine; recast layer
- 摘要:
- 气膜冷却孔已被广泛应用于航空发动机涡轮叶片中，并在提升发动机服役温度方面发挥着不可替代的作
用。 电火花制孔是高效率加工高质量气膜冷却孔的重要加工工艺之一。 电火花加工的气膜冷却孔周围通常不可避免产
生重熔层组织，其由加工过程中熔融金属的超快速凝固形成。 重熔层对叶片冷却效率和服役性能均有一定影响，已成为
该研究领域关注热点之一。 本文重点综述了电火花加工气膜冷却孔及重熔层的研究进展，介绍了重熔层在加工过程中
的演化过程及组织特征，分析了重熔层组织对涡轮叶片性能的影响，同时回顾了针对加工“无重熔层”的气膜冷却孔为
目标的工艺优化。 研究表明，对重熔层的理解有利于通过进一步工艺优化控制并消除重熔层厚度。
Film cooling holes (FCHs) have been widely used in turbine blades of air engines, playing a vital role in raising the engine service temperature. Electrodischarge machining (EDM) has become one of the main methods for processing FCHs with high efficiency and quality. However, the recast layer (RL) is usually inevitable around the FCHs by EDM, which is formed by the ultrafast solidification of the molten metal during processing. Research on RL has gained important attention in the aviation field because it affects not only the cooling efficiency but also the service performance of blades. This paper summarizes the research progress of FCHs and RL processed by EDM and introduces the evolution and microstructure characteristics of the recast layer. At the same time, with the goal of processing “FCHs without RL”, we review some process optimization methods for processing FCHs by EDM. All the studies show that an understanding of the RL is beneficial to further utilize process optimization to control and eliminate the RL thickness