Restoration of Nickel-Base Turbine Blade Knife-Edges with Controlled Laser Aided Additive Manufacturing
By G. Bi, A. Gasser. 2011
136 citations recorded by the source corpus.
In this paper, restoration of nickel-base turbine blade knife-edges with controlled Laser Aided Additive Manufacturing (LAAM) process was investigated. The alloy contains about 9 weight percent Ti/Al composition, which makes it difficult to repair due to the cracking issue. Infrared temperature signal emitted from melt pool was adopted for process control. The deposition with and without process control was compared. The deposition with process control can avoid the hot-cracking which often occurs during deposition of nickel-base super-alloys. The results showed that the process control can also guarantee a better dimensional accuracy. The microstructure of the deposited layers in the cross-section was examined under both microscope and SEM. It displayed directionally solidified fine columnar dendrites which grew following the change of the heat conduction condition. The EDX line scanning verified that chemical composition remained homogeneous distribution in the deposited thin wall. Spot EDX analysis identified that TiC is most likely the main type of carbides formed at the grain boundaries. The results demonstrated that the LAAM process is feasible for the recondition of the gas turbine blade knife-edges.
Subfields: Mechanical Engineering, Mechanics of Materials
View Paper: https://www.semanticscholar.org/paper/5b0313787848217a458185d66fcc2736f784d83e
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In Mechanical Engineering
- J. P. Oliveira
- Telmo G. Santos
- R. Miranda
- A. Saboori
- G. Marchese
- A. Aversa
- Mariangela Lombardi
- Paolo Fino
In Mechanics of Materials
Citations in the corpus
- Application of Directed Energy Deposition-Based Additive Manufacturing in Repair (2019, background): “However, the complexity and cost of these apparatus limit their application [21,22].”
- Additive manufacturing of Ni-based superalloys: The outstanding issues (2016, unknown): “7 high energy input during AM as the reason for liquation cracking due to low melting point phases (63),”
- Turbomachinery component manufacture by application of electrochemical, electro-physical and photonic processes (2014, unknown): “Photonic processes II: laser drilling of cooling holes”
- Revisiting fundamental welding concepts to improve additive manufacturing: From theory to practice (2020, methodology): “[193] are further corroborated in [194], where laser-assisted additive manufacturing was used for the repair of a Ni-based turbine: by decreasing the process heat input, the cracking susceptibility decreased.”