| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Environments
|
| Presentation Title |
Ultrafine-grained and nanocrystalline steels in extreme environments |
| Author(s) |
Haiming Wen, Joshua Rittenhouse |
| On-Site Speaker (Planned) |
Haiming Wen |
| Abstract Scope |
Bulk ultrafine-grained and nanocrystalline metals possess drastically higher strength than their conventional coarse-grained counterparts, and are anticipated to have significantly enhanced irradiation tolerance owing to the role of grain boundaries. In this study, ultrafine-grained and nanocrystalline austenitic and ferritic steels were manufactured by equal-channel angular pressing (ECAP) and high-pressure torsion (HPT), respectively. The microstructure, mechanical behavior, thermal stability and corrosion behavior of the steels manufactured were carefully studied. These bulk nanostructured steels were thermally stable up to at least 500 oC. Ultrafine-grained steels exhibited better steam corrosion resistance than coarse-grained ones. Ion irradiation and neutron irradiation were performed to study irradiation behavior of the steels. Irradiation-induced defects in ultrafine-grained and nanocrystalline steels were significantly less than those in the coarse-grained steels. After neutron irradiation, ultrafine-grained and nanocrystalline steels retained their ductility significantly better than their coarse-grained counterparts. All these results indicate enhanced irradiation tolerance of ultrafine-grained and nanocrystalline steels. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Nuclear Materials, Phase Transformations |