| About this Abstract |
| Meeting |
10th International Symposium on Superalloy 718 and Derivatives (2023)
|
| Symposium
|
Superalloy 718 and Derivatives
|
| Presentation Title |
IN718 Cold Gas Repair Spray of Large Cavities – Microstructure and Residual Stresses |
| Author(s) |
Florian Lang, Johannes-Christian Schmitt, Sandra Cabeza, Thilo Pirling, Jochen Fiebig, Robert Vaßen, Jens Gibmeier |
| On-Site Speaker (Planned) |
Florian Lang |
| Abstract Scope |
Cold spraying is an established process for coating substrates with similar or dissimilar materials. By use of a high-pressure process gas stream, solid particles are accelerated onto a substrate at high velocities. The method is particularly suited for repair applications, since neither structural changes nor oxidation occur during the process. Furthermore, cold spray coating usually induces compressive residual stresses in the coating system that positively influence the fatigue behaviour.
To investigate the suitability of the cold spray process for repairing large cavities in Inconel 718 components, sample geometries were manufactured, containing tapered cavities with a depth of 4 mm. The cavities were filled with Inconel 718 particle by cold gas spraying. Non-destructive high-resolution neutron diffraction experiments were performed using the SALSA instrument at the Institut Laue-Langevin (ILL) to evaluate the local residual stress state in the as-sprayed condition. 2D maps of the residual stress distribution over the cross- sectional area of the samples were determined. Additionally, complementary laboratory X-ray diffraction (XRD) and incremental drilling analyses were carried out. The results indicate compressive residual stresses within the filled process zone, which are considered positive for the fatigue and wear resistance of the repaired components. Furthermore, metallographic examinations show a good bonding between the repair filling and the substrate as well as strongly deformed particles within the repaired region. The latter indicates significant plastic deformation during cold spraying, which is in agreement with the broader diffraction lines from the neutron and X-ray diffraction analyses in the filler compared to the substrate. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |