|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||Atom Probe Tomography Investigations of Reactor Pressure Vessel Steels Using High Dose Charged Particle Irradiations
||Nathan Almirall, Peter Wells, Takuya Yamamoto, David Gragg, G. Robert Odette, Keith Wilford, Ian Edmonds, Sosuke Kondo, Akihiko Kimura
|On-Site Speaker (Planned)
Nuclear fission reactor service life extension is limited by nano-scale precipitates and other hardening features which increase the yield strength of RPV steels resulting in corresponding embrittlement. However, neutron irradiation experiments are costly and time consuming, typically requiring many years to complete. Charged particle irradiations (CPI) take hours to produce 80-year RPV dpa doses and offer a high degree of control over the other irradiation variables. While CPI do not directly simulate neutron embrittlement, they do provide a convenient and cost effective way to gain insight into radiation damage mechanisms. Comparisons between CPI and neutron irradiations, based on Atom Probe Tomography (APT), show CPI produce similar Mn-Ni-Si precipitate compositions and volume fractions. These precipitates preferentially form along dislocations and on dislocation loops. APT is used to quantify solute enrichment/depletion at decorated dislocation loops, dislocation densities and the role of radiation induced segregation (RIS) at high dose.
||Planned: A print-only volume