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Volume 13
Issue 4
10.3390/met13040695
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Communication

Revealing the Formation of Recast Layer around the Film Cooling Hole in Superalloys Fabricated Using Electrical Discharge Machining

by
Zenan Yang
1,
Lu Liu
2,
Jianbin Wang
2,
Junjie Xu
1,
Wanrong Zhao
1,
Liyuan Zhou
1,
Feng He
2 and
Zhijun Wang
2,*
1
Science and Technology on Advanced High-Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
2
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
*
Author to whom correspondence should be addressed.
Metals 2023, 13(4), 695; https://doi.org/10.3390/met13040695
Submission received: 20 February 2023 / Revised: 25 March 2023 / Accepted: 31 March 2023 / Published: 3 April 2023
(This article belongs to the Special Issue Deformation, Fracture and Microstructure of Metallic Materials)
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Abstract

A film cooling hole is an efficient and reliable cooling method, which is widely used in aeroengine turbine blades to effectively improve the thrust–weight ratio of the engine. Electrical discharge machining is the most common manufacturing process for film cooling holes. Due to the rapid quenching after high-temperature melting, a certain thickness of the recast layer will be formed in the vicinity of the hole wall. The microstructure of the recast layer is considered to be an important factor affecting the performance of single-crystal blades. Generally, the recast layer has been thought of as one of the main reasons for the failure of turbine blades. Accordingly, the formation of the recast layer is an important and interesting issue to be revealed. In this work, the recast layer formed using electrical discharge machining on a single-crystal superalloy is studied with TEM. It is found that the recast layer is in the state of supersaturated solution with a single-crystal structure epitaxially grown from the matrix, and many dislocations were observed therein.
Keywords: film cooling hole; electrical discharge machining; recast layer; microstructure film cooling hole; electrical discharge machining; recast layer; microstructure

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MDPI and ACS Style

Yang, Z.; Liu, L.; Wang, J.; Xu, J.; Zhao, W.; Zhou, L.; He, F.; Wang, Z. Revealing the Formation of Recast Layer around the Film Cooling Hole in Superalloys Fabricated Using Electrical Discharge Machining. Metals 2023, 13, 695. https://doi.org/10.3390/met13040695

AMA Style

Yang Z, Liu L, Wang J, Xu J, Zhao W, Zhou L, He F, Wang Z. Revealing the Formation of Recast Layer around the Film Cooling Hole in Superalloys Fabricated Using Electrical Discharge Machining. Metals. 2023; 13(4):695. https://doi.org/10.3390/met13040695

Chicago/Turabian Style

Yang, Zenan, Lu Liu, Jianbin Wang, Junjie Xu, Wanrong Zhao, Liyuan Zhou, Feng He, and Zhijun Wang. 2023. "Revealing the Formation of Recast Layer around the Film Cooling Hole in Superalloys Fabricated Using Electrical Discharge Machining" Metals 13, no. 4: 695. https://doi.org/10.3390/met13040695

APA Style

Yang, Z., Liu, L., Wang, J., Xu, J., Zhao, W., Zhou, L., He, F., & Wang, Z. (2023). Revealing the Formation of Recast Layer around the Film Cooling Hole in Superalloys Fabricated Using Electrical Discharge Machining. Metals, 13(4), 695. https://doi.org/10.3390/met13040695

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