About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Developments in Advanced Nuclear Structural Materials
|
| Presentation Title |
Enhanced Irradiation Resistance of Ultrafine-Grained and Nanocrystalline Steels |
| Author(s) |
Haiming Wen, Joshua Rittenhouse |
| On-Site Speaker (Planned) |
Haiming Wen |
| Abstract Scope |
Bulk ultrafine-grained (UFG) and nanocrystalline (NC) metals possess drastically higher strength than their conventional coarse-grained (CG) counterparts, and are anticipated to have significantly enhanced irradiation tolerance owing to the role of grain boundaries. In this study, UFG and NC austenitic or ferritic steels were manufactured by equal-channel angular pressing and high-pressure torsion, respectively. Ion irradiation and neutron irradiation were performed to study irradiation behavior of the steels. Irradiation-induced dislocation loops in UFG and NC steels were significantly less than CG steels. Irradiation-induced hardening in UFG samples was reduced compared to CG ones. UFG and NC austenitic steels were more resistant to irradiation-induced polymorph phase transition. Small grain sizes reduced irradiation-induced segregation and precipitation in austenitic steels. Irradiation-induced grain growth in UFG and NC steels was very limited. UFG and NC steels were more resistant to irradiation embrittlement. All these results indicate enhanced irradiation tolerance of UFG and NC steels. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Phase Transformations, Nanotechnology |