On the feasibility of BLISK produced by linear friction welding
DOI:
https://doi.org/10.3989/revmetalm.023Keywords:
Aero-engines, BLISK (Bladed Disk), Demonstrator, Linear Friction Welding (LFW), Titanium alloys (Ti-6246 and Ti-64)Abstract
Friction welding technologies are solid-state processes that convert mechanical energy into heat at the joint to be welded. In the case of linear friction, interatomic diffusion takes place under compressive contact by rubbing one component across the face of the other. It is a relatively recent technology which has found important applications in the aeronautical sector. Specifically, it is applied by world leading aero-engine manufacturers for the fabrication of BLISK, a design where disk and blades are a single component. It is obvious that for such a critical function the reliability of linear friction welds must be totally guaranteed. The present work displays results concerning the characterization, both microstructural and mechanical, of a BLISK demonstrator designed for the intermediate pressure compressor of an aero-engine. Moreover, considering that the design constrains for disks and blades on the compressors are quite different, dissimilar titanium alloys were selected for each part in order to improve the BLISK in-service performance. The results establish that linear friction welding is a reliable process which can produce joints free of defects and with mechanical properties comparable to those of the corresponding base materials.
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