| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior of Nuclear Reactor Materials and Components IV
|
| Presentation Title |
Effects of Radiation-Induced Segregation on the Structure-Property Relationship of RPV Steel Electron Beam Welds |
| Author(s) |
Elliot H. Marrero, Grayson Nemets, Jasmyne Emerson, Yu Lu, Maria Okuniewski, Janelle Wharry |
| On-Site Speaker (Planned) |
Elliot H. Marrero |
| Abstract Scope |
This talk aims to understand the differences in non-hardening embrittlement in the weld heat-affected zones (HAZ) between PM-HIP and forged reactor pressure vessel (RPV) steels. RPVs are crucial safety components in nuclear power plants typically made by forging plates of low alloy steel. However, novel manufacturing techniques like powder metallurgy with hot isostatic pressing (PM-HIP) and electron beam (EB) welding offer the opportunity to reduce manufacturing time and cost over conventional forgings. Under irradiation, RPV steels and their welds experience embrittlement through nanoprecitation and dislocation loop nucleation as well as non-hardening embrittlement (NHE). NHE is caused by radiation-induced segregation (RIS) which reduces grain boundary cohesion and increases susceptibility to intergranular fracture. Nanoindentation indicates that EB welded HAZs in forged SA508 RPV steel is more susceptible to irradiation hardening than that in PM-HIP SA508. This is ascribed to significant differences in Si RIS between the PM-HIP and forged SA508. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Nuclear Materials, Characterization |