| About this Abstract |
| Meeting |
2023 AWS Professional Program
|
| Symposium
|
2023 AWS Professional Program
|
| Presentation Title |
Feasibility of LP-DED and L-PBF Processes in the Repair of GTD 111 Turbine Blades using René 65 Powder |
| Author(s) |
Henry León-Henao, Edward Herderick, Alejandro Toro, Jorge Enrique Giraldo Barrada, Antonio J. Ramirez |
| On-Site Speaker (Planned) |
Henry León-Henao |
| Abstract Scope |
Repair components of the hot gas path is crucial for economic reasons in gas turbine engines. In this work, a characterization of deposits applied by Laser Powder Bed Fusion (L-PBF) and Laser Powder Directed Energized Deposition (LP-DED) on a 1st stage blade made of GTD 111 DS superalloy were carried out. The 1st stage blades are damaged in operation due to collision of external objects, development of thermal fatigue cracks and high-temperature erosion, which drastically reduces their lifetime. The process parameters for L-DED and L-PBF were established as a function of the integrity and geometry of the deposits. René 65 powder was used for both processes without preheating. Visual inspection and macro etching were used to evaluate the weld metal deposits soundness. Optical microscopy and scanning electron microscopy were used to examine the microstructure of the deposited layers in the cross-section and EBSD allowed studying the crystallographic texture. Compared to conventional processes, L-PBF and LP-DED provide crack-free deposits and better control of shape and dimensions, reducing machining time. In particular, the L-PBF process has greater precision, which makes it ideal for replicating the blade’s cooling holes. The study demonstrates the feasibility to restore dimensions of a tip blades and illustrates the significant potential of Additive Manufacturing (AM) utilizing powders of high γ' to avoid hot cracking. |
| Proceedings Inclusion? |
Undecided |