| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior of Nuclear Reactor Components
|
| Presentation Title |
In-situ Observations of the Failure Mechanisms of Hydrided Zircaloy-4 under Different Stress-States |
| Author(s) |
Brian V. Cockeram, Kwai Chan |
| On-Site Speaker (Planned) |
Brian V. Cockeram |
| Abstract Scope |
In-situ testing of notched Zircaloy-4 specimens with varying levels of hydrogen was performed, and the deformation mechanisms were characterized. High-resolution Electron Backscattered Diffraction (EBSD) was used to quantify the distribution of residual stresses near the hydrides. The effect of local texture on the hydride distribution and fracture mechanism was observed. Stress-state is also shown to have a significant effect on the fracture mechanism. A process of void nucleation, growth, and coalescence has been observed for the non-hydrided condition. For hydrided materials, a similar mechanism is observed in the regions between the hydrides. Cracking of the hydrides may occur at local regions of high strain when the macroscopic deformation is elastic. The fracture of hydrides is strongly dependent on the residual stresses, local texture, and stress state. A micromechanical model is developed for hydrided Zircaloy-4 that accounts for the effects of stress-state, residual stress from hydride formation, local texture, and temperature. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Mechanical Properties, |