| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Methods, Techniques, and Materials Discovery of Irradiation Effect Using In-situ Microscopy
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| Presentation Title |
Helium Effects on Defect Evolution of In-situ Irradiated Additive-manufactured Grade 91 Steel |
| Author(s) |
Yan-Ru Lin, Arunodaya Bhattacharya, Wei-Ying Chen, Steven Zinkle |
| On-Site Speaker (Planned) |
Yan-Ru Lin |
| Abstract Scope |
The microstructural responses under eight in-situ single (Fe or He) and dual (Fe and He) ion-beam irradiation conditions of additive-manufactured (AM) Grade-91 steel using a powder-based directed energy deposition (DED) technique with post-build heat treatments were investigated. The 3D printed materials were irradiated with 400 KeV Fe and/or 15 KeV He at 500-600°C to 0.6-1.2 dpa with He content of 0-20 at%. Using the Intermediate Voltage Electron Microscopy-Tandem facility in Argonne National Laboratory, the dynamic evolution of dislocation lines, dislocation loops, and cavities were analyzed by transmission electron microscopy. With the addition of He implanted atoms, the dislocation loop density increased while the loop diameter decreased. Cavities were only found in the conditions with single He ion and dual Fe+He ion irradiations. The incubation period of cavities as well as the distribution of cavities near the primitive particles, grain boundary, or dislocation loops will be presented. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Nuclear Materials, Iron and Steel |