About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advancements in Molten Salt/Metal Technology in Energy Applications: From Atoms to Plants
|
| Presentation Title |
Novel Al/Ti-Modified Ni-Mo-W-Cr Alloys for High Temperature Structural Applications in Molten Chloride Fast Reactors |
| Author(s) |
Sonali Ravikumar, Naveen kumar Nagaraja, Boateng Twum Donkor, Vishal Soni, Vijay K Vasudevan, Jie Song |
| On-Site Speaker (Planned) |
Sonali Ravikumar |
| Abstract Scope |
Molten chloride salts are high-temperature (400–950°C) thermal energy storage and heat transfer fluid for next-generation nuclear reactors. Corrosion of structural alloys at these elevated temperatures remains a challenge. Ni-Mo-W-Cr alloys have superior corrosion resistance over Fe-based alloys, but none meet the combined requirements of high-temperature strength, corrosion and irradiation resistance for MCFRs. This work aims to design Ni-Mo-W-Cr-Al-Ti alloys for MCFRs using an ICME approach. Alloys with varying Mo/W ratios and Al/Ti additions were thermal aged (700–850°C) and corrosion-tested in KCl-NaCl-MgCl₂ salt. Al/Ti-modified alloys showed increased hardness due to γ′/γ″ and W/Mo-rich precipitates and had corrosion-resistance comparable to commercial alloys due to protective Al/Ti-rich oxide scales. To optimize the microstructure, Mo-concentration was systematically varied in Al/Ti-containing Ni-Cr-W-Mo alloys. The impact of varying Mo-concentration in the presence of Al/Ti on ordered-phase development and strengthening mechanisms will be discussed in the context of alloy optimization for structural use in MCFRs. |