About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Tackling Structural Materials Challenges for Advanced Nuclear Reactors
|
Presentation Title |
Microstructural Evolution of High-throughput Additively Manufactured 316L Stainless Steel with Increasing Hafnium Dopants |
Author(s) |
Laura Hawkins, Jingfan Yang, Miao Song, Daniel Schwen, Yongfeng Zhang, Lin Shao, Xiaoyuan Lou, Lingfeng He |
On-Site Speaker (Planned) |
Lingfeng He |
Abstract Scope |
Development of high throughput characterization methods is an important capability for reducing time and cost and increasing efficiency in qualifying a structural material for reactor use. Directed-energy-deposition (DED) was used to additively manufacture (AM) two compositionally graded 316L stainless steels to study the effects of Hf dopants on irradiation response: an as-built material and a thermo-mechanically treated recrystallized material to simulate a wrought grain structure. Microstructure and chemical composition of the AM materials were analyzed using transmission electron microscopy and associated spectroscopy techniques. Stacking faults in the unirradiated microstructure proved the rel-rod dark-field imaging technique is inefficient for quantifying dislocation loop size and density in AM materials. The Hf dopants can refine the grain structure to suppress nucleation of voids, irradiation-induced dislocation loops and grain boundary segregation. Compositionally gradient design using AM technique can be used for high throughput nuclear alloy development and qualification. |