| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Mechanisms and Mitigation of Aqueous Corrosion and High-temperature Oxidation
|
| Presentation Title |
Microstructural Characterization and High-Temperature Oxidation of Laser Powder Bed Fusion Processed Inconel 625 |
| Author(s) |
Emily Rose Lewis, Nick Cruchley , Moataz Attallah, Sam Cruchley |
| On-Site Speaker (Planned) |
Emily Rose Lewis |
| Abstract Scope |
Laser Powder Bed Fused (L-PBF) Inconel 625 (IN625) is a prime candidate for the design of oxidation resistant components at high temperatures. However, existing research into the microstructure and oxidation performance of L-PBF IN625 is limited to short time exposures non-reflective of in-service conditions. This study aims to identify the influence of printed microstructure, post-process heat treatment, and surface modifications on the long-term isothermal oxidation behaviour of L-PBF IN625. Oxidation mechanisms were analysed using mass gain kinetics and oxide film characterisation using scanning electron microscopy, energy dispersive spectroscopy and electron backscatter diffraction. Results showed that printed features such as a dendritic microstructure, microsegregation of Nb and Mo, texture, and surface roughness collectively influenced the oxidation properties. The morphology and distribution of δ-phase (Ni3(Nb,Mo)) precipitate also differed across different heat treatments and surface finishes. Oxidation kinetics were similar to wrought alloy, but more closely followed sub-parabolic and cubic behaviours. |