|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Hume-Rothery Award Symposium: Alloy Phase Chemistry at the Atomic Level - Opportunities and Challenges
||Microstructural Characterization of Mn-Ni-Si Precipitates in Reactor Pressure Vessel Steels from the High Fluence Intermediate Flux UCSB ATR-2 Irradiation
||Nathan Almirall, Peter Wells, Takuya Yamamoto, G. R. Odette, Randy Nanstad, Keith Wilford, Tim Williams, Lynne Ecker, David Sprouster
|On-Site Speaker (Planned)
Some initial results from the UCSB Advanced Test Reactor (ATR-2) neutron irradiation experiment (high fluence, intermediate flux) will be discussed. UCSB ATR-2 fills a critical gap in embrittlement data and understanding, especially since current models systematically underpredict ductile-to-brittle transition temperature shifts at high fluence. Recent research has demonstrated the existence of high volume fractions of intermetallic Mn-Ni-Si precipitate (MNSP) phases which contribute to embrittlement at high fluence and has generated significant insight into their character. This presentation covers microstructural characterization of MNSPs in a new subset of alloys procured by Rolls Royce for UCSB ATR-2 with varying levels of Ni, Mn, and Si, designed to expand RPV composition range and explore potential for tougher and higher strength steels in advanced reactors. A wide range of techniques were used including atom probe tomography (APT); (b) small angle neutron scattering (SANS); (c) small angle x-ray scattering (SAXS) and X-ray diffraction (XRD).
||Planned: Supplemental Proceedings volume