About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Conditions
|
| Presentation Title |
Dislocation Engineering by PM-HIP to Limit Irradiation Hardening and Embrittlement in Ferritic Steels |
| Author(s) |
Janelle P. Wharry, Grayson A Nemets, Soumita Mondal, Arya Chatterjee, Elliot H Marrero-Jackson, Yu Lu, Yaqiao Wu |
| On-Site Speaker (Planned) |
Janelle P. Wharry |
| Abstract Scope |
This talk reveals how residual dislocations from powder metallurgy with hot isostatic pressing (PM-HIP) can enhance the mechanical performance of ferritic steels under irradiation. Low- and high-alloy ferritic steels are workhorse structural materials for nuclear power applications, but irradiation hardening and embrittlement remain life-limiting challenges. Dislocations influence the strength-ductility tradeoff – they are necessary for plastic deformation, yet their overabundance can cause embrittlement. Here, we study neutron irradiated PM-HIP ferritic steels containing high residual dislocation density. In both low- and high-alloy ferritic steels, radiation-induced segregation (RIS) at dislocation lines enables unique mechanical phenomena. For example, in PM-HIP low-alloy steel, RIS of Si and other core elements (e.g., Cu, Cr) limits irradiation hardening. In PM-HIP Grade 91 ferritic stainless steel, Si RIS extends plasticity without a corresponding increase in stress. These results suggest that PM-HIP processing can be used to engineer dislocations and enable exceptional mechanical performance in extreme irradiation environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Mechanical Properties, Powder Materials |