| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
Study of Deformation Mechanisms in Various Heat-treated AM-IN718 Using Transmission Electron Microscopy |
| Author(s) |
Thomas G. Gallmeyer, Jack E. Dale, Behnam Aminahmadi, Aaron P Stebner |
| On-Site Speaker (Planned) |
Thomas G. Gallmeyer |
| Abstract Scope |
Previous work by the authors explored the structure-property relationships of AM-IN718 after the application of various post-processing heat treatment. It was shown that the coexistence of preserved dislocation cell substructures from the AM process, in conjunction with nanoprecipitation from aging, led to increased yield strength and ultimate tensile strength without a significant decrease in ductility. In an effort to better understanding the influence of the AM-specific microstructural aspects, the microstructure of each sample was examined using transmission electron microscopy after monotonic tensile deformation. Results show various deformation mechanisms for each heat treatment, including shear band formation, dislocation pileups, precipitate shearing, and nanotwin formation along slip traces. In addition, interaction of the shear bands with the preserved dislocation cells and nanoprecipitation is also discussed at the atomic scale. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |