About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Accelerated Discovery and Qualification of Nuclear Materials for Energy Applications
|
Presentation Title |
Development and Qualification of Ultrafine-grained and Nanocrystalline Steels for Nuclear Applications |
Author(s) |
Haiming Wen, Andrew Hoffman, Maalavan Arivu, Rinat Islamgaliev |
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 as sinks for irradiation-induced defects. In this study, ultrafine-grained and nanocrystalline austenitic and ferritic-martenstic steels were manufactured by equal-channel angular pressing (ECAP) and high-pressure torsion (HPT), respectively. The microstructure and mechanical behavior of these steels were carefully studied. Advanced microstructural characterization techniques were utilized to investigate the microstructures and chemistry of the steels before irradiation. The thermal stability of the ultrafine-grained and nanocrystalline steels was also investigated. Neutron and ion irradiations were performed to study irradiation behavior. Results indicated that the ultrafine-grained and nanocrystalline steels manufactured by ECAP and HPT possess significantly improved hardness/strength and enhanced phase stability during irradiation, compared to their coarse-grained counterparts. Smaller grains possess reduced irradiation-induced hardening, segregation and precipitation compared to larger grains. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Nuclear Materials, Characterization |