| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
Evolution of Micro-structure and Hardening in Modified Ni-Mo-Cr-W Alloys |
| Author(s) |
Naveen Kumar N, Vishal Soni, Boateng Twum Donkor, Sonali Ravikumar, J Song, M. A. Steiner, Abhishek Sharma, Sriswaroop Dasari, Rajarshi Banerjee, Govindarajan Muralidharan, Ravi Vilupanur , Steven J. Zinkle, Vijay K Vasudevan |
| On-Site Speaker (Planned) |
Naveen Kumar N |
| Abstract Scope |
Ni-Mo-Cr-W alloys are candidate materials for structural applications in molten salt fast reactor systems. A few modified NiMoCrW alloys with varying Mo/W and other elements such as Al/Ti/Nb were cast at lab scale. These alloys were solution heat treated and aged at temperatures from 700-850 ° C up to 400 hours. The hardness variation of these alloys showed interesting behavior with aging where Al/Ti/Nb additions gave significant hardening. Haynes 244 alloy with 3% Al also showed high hardness in the as-cast condition and significant hardening after aging. Alloying and aging effects on the micro-structure and its correlation to the mechanical properties was investigated using XRD, SEM, S/TEM and APT. The results revealed presence of SRO and LRO structures after aging, including Ni<sub>2</sub>(MoCrW), DO<sub>22</sub> and L1<sub>2</sub> and Mo/W rich phase particles along with µ/σ/p phases. Possible causes of alloying effects on ordered phase formation and hardening mechanisms will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Nuclear Materials, Copper / Nickel / Cobalt |