|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Applications Utilizing Irradiation and Integrated Modeling
||Promotion and Suppression of the G-phase in Steels
||Daniel JM King, Thomas M Whiting, Mark R Wenman
|On-Site Speaker (Planned)
||Daniel JM King
Solute clustering and G-phase precipitation cause hardening phenomena observed in low alloy reactor pressure vessel steels and duplex steels for coolant piping. Density functional theory was used to make a comparison of 22 different G-phase compositions. The Mn6Ni16Si7 composition was found to have the most similar elastic properties to α-Fe. Further investigation into the effect of solute species 14 elements on the formation of the Mn-Ni-Si G-phase in a ferrite matrix was made. Many species known to cluster with Mn, Ni and Si were also found to stabilise the G-phase structure. A comparison in formation enthalpy between the G-phase and body centred cubic structure was made for Fe-Mn-Ni-Si compositions to assess the site preference of Fe when in high concentrations.