| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments
|
| Presentation Title |
Long-range Ordering in Alloy 690 via Isothermal Aging and Irradiation |
| Author(s) |
Julie D. Tucker, Cole Evered, Nicholas Aerne, Luanne Rolly, David Sprouster |
| On-Site Speaker (Planned) |
Julie D. Tucker |
| Abstract Scope |
The formation of long-range ordered phase Ni2Cr in commercial alloy 690 has long been debated as a potential concern in nuclear power applications. The ordered phase is known to cause hardening, embrittlement and lattice contraction but the timescale associated with its formation in commercial alloys has been unclear. In this work, we isothermally aged commercial alloys up to 30,000 hours at 360-475°C and then quantify the Ni2Cr precipitates with synchrotron x-ray diffraction. We find that Ni2Cr forms in Alloy 690 by 20,000 hours 418°C. Additionally, we study the role of P impurities as a potential accelerating factor in Ni2Cr formation by irradiating Alloy 690 with and without 0.01wt.% P additions. The P containing alloy forms Ni2Cr precipitates while the pure 690 alloy does not when irradiated at 350°C to 1.5dpa. Lastly, we compare irradiated and isothermally aged Ni-Cr-Fe model alloys to quantify the acceleration in ordering provided by proton irradiation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Phase Transformations, High-Temperature Materials |