| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior of Nuclear Reactor Components
|
| Presentation Title |
α’ Precipitation and Hardness Change in Ion Irradiated High Purity FeCr Alloys |
| Author(s) |
Yajie Zhao, Arunodaya Bhattacharya, Cristelle Pareige, Pengcheng Zhu, Caleb Massey, Philip Edmondson, Jean Henry, Steven Zinkle |
| On-Site Speaker (Planned) |
Yajie Zhao |
| Abstract Scope |
FeCr based ferritic-martensitic steels suffer from radiation-enhanced Cr-rich alpha prime phase (α’) separation which induces severe hardening and embrittlement. However, the α’ phase separation was seldom reported after high-dose rate ion irradiations. To study the hardening response of non-equilibrium α’, high-purity Fe(10-18%)Cr alloys were irradiated at varying dose rates (10-5-10-3 dpa/s) and temperatures (300-450 °C) to 0.35 or 3.5 dpa. The post-irradiation characterization, performed using atom probe tomography, revealed homogeneously distributed α’ precipitates, for temperatures down to 300 °C and up to a damage rate of 10-3 dpa/s, after ion irradiations. Most measured clustered Cr concentrations were below the equilibrium values suggested by the phase diagram, while clusters with higher Cr concentration were observed at lower dose rates or high temperatures. By combining the APT results with hardness changes measured by nano-indentation and using theoretical hardening models, the contribution of α’ to the hardening of FeCr alloys will be quantified. |
| Proceedings Inclusion? |
Planned: |