| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior of Nuclear Reactor Materials and Components IV
|
| Presentation Title |
Mesoscale Simulation of Mn-Ni Rich Precipitate Pinning of Dislocations in Reactor Pressure Vessel Steels |
| Author(s) |
Ashley Foster, Douglas E. Spearot |
| On-Site Speaker (Planned) |
Ashley Foster |
| Abstract Scope |
Neutron irradiation induced hardening of reactor pressure vessel (RPV) steels has become a major concern for lifetime extension of light water reactors. Unfortunately, the mesoscale mechanisms by which hardening occurs are not fully understood, limiting predictive model development. The objective of this work is to simulate mesoscale mechanical testing by isolating the interaction between dislocations and Mn-Ni rich precipitates (MNPs), which are common in RPV steels at high fluence (>1x1020 n/m2). MNPs heterogeneously nucleate on and around established dislocation networks, preventing dislocation motion and plastic strain relief. Using discrete dislocation dynamics (DDD) modeling to isolate mechanistic features of interest, the extent to which MNPs increase the RPV steel yield strength will be assessed. Hardening via MNP pinning of edge and screw dislocations, with varying precipitate size and number density, will be considered. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Nuclear Materials, Mechanical Properties |