About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
Corrosion of High Creep Strength Nickel-Based Alloy in Molten FLiNaK Salt in the 700°C-750°C Temperature Range |
| Author(s) |
Ryan Gordon, Kasturi Sasidhar, Ryan Thier, Jaimie Tiley, Rishi Pillai, Steve Zinkle, Evan Willing, Adrien Couet, Kumar Sridharan |
| On-Site Speaker (Planned) |
Ryan Gordon |
| Abstract Scope |
The corrosion behavior of a high creep strength carbide-phase strengthened Ni-based alloy in molten FLiNaK (LiF-NaF-KF: 46.5-11.5-42 mol%) salt in the temperature range of 700°C-750°C has been investigated as a part of the development of structural alloys for fluoride salt-based molten salt reactors (MSRs). The alloy composition was designed based on the well-known Hastelloy-N, but with the goal of improving creep strength. Sequential corrosion testing of pre-tested samples in fresh salt coupled with SEM-EDS, scanning transmission electron microscopy (STEM) and thermodynamic and kinetic modeling, suggest that the corrosion rate at the alloy-salt interface is governed by diffusion of elements from the alloy bulk to the surface. Corrosion-induced depletion of Cr from the alloy matrix led to the enrichment of corrosion-resistant Mo at the alloy surface. Atom probe tomography (APT) showed some partitioning of Cr to the carbide phase and indicated the carbide phases to be stable at the salt-facing surface. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Nuclear Materials, Characterization |