| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Elucidating Microstructural Evolution Under Extreme Environments
|
| Presentation Title |
Effect of Processing-Induced Precipitates on Nanoprecipitation and Radiation-Induced Segregation in Electron Beam Welded PM-HIP Low-Alloy Steel |
| Author(s) |
Grayson Nemets, Elliot Hanel Marrero, Jasmyne Emerson, Janelle Wharry, Maria Okuniewski, Zhongxia Shang, Yu Lu |
| On-Site Speaker (Planned) |
Grayson Nemets |
| Abstract Scope |
This talk examines the effects of processing-induced precipitates on the formation of radiation-induced nanoprecipitates and segregation in SA508 steel. Powder metallurgy with hot isostatic pressing (PM-HIP) and electron-beam (EB) welding have the potential to drastically lower the cost and time for the production of new reactor pressure vessels. In low-alloy steels, radiation embrittlement is driven by radiation-induced segregation and formation of nanoprecipitates. The morphology of these nanoprecipitates is controlled by the matrix concentrations of the precipitating elements, such as Mn and Si. The complex thermal and pressure histories involved in the PM-HIP and EB welding processes create several different types of metastable Mn- and Si-rich precipitates prior to irradiation, which can act to sequester these precipitating species, reducing their matrix concentration and consequently altering the post-irradiation precipitation. These precipitates also promote radiation-induced segregation of solute elements. These competing effects necessitate careful control of pre-irradiation precipitation to optimize post-irradiation performance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Nuclear Materials, Powder Materials |