| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments
|
| Presentation Title |
Investigation of Effect of Stress on Laves Phase Precipitation and Growth in Creep-ruptured Grade 92 Steel |
| Author(s) |
Emily Proehl, Steven Zinkle, Lizhen Tan, Ying Yang, David Sprouster, Weicheng Zhong |
| On-Site Speaker (Planned) |
Emily Proehl |
| Abstract Scope |
Improved thermal efficiency of fossil and nuclear power plants necessitates materials with high creep strength, such as Grade 92 (G92) steel. The creep resistance of G92 steel is enhanced by precipitate phases, notably M23C6 (M=Fe, Cr), MX (M=V, X=C, N), and Laves phase (Fe2W, Fe2Mo). Temperature effects corresponding to Laves phase precipitation and creep lifetime are well-documented; fine-scale precipitates initially retard secondary creep but expedite tertiary creep upon coarsening. The effect of stress on Laves phase precipitation and its impact on creep life is less known. To investigate this effect, G92 steel samples were creep tested at 550 – 650°C and 90 – 260 MPa. The Laves phase distribution was investigated via SEM-BSE imaging, and the phase fraction and lattice parameters were quantified via synchrotron transmission XRD. Neutron diffraction residual stress analysis was performed to quantify the recovery in the creep-ruptured samples and correlate it with the Laves phase distribution. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Nuclear Materials, Phase Transformations |