|About this Abstract
|MS&T21: Materials Science & Technology
|Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments
|A Closer Observation to the Precipitation Behavior of Proton Irradiated Dual Phase 308L Weldment Filler Materials
|Zhen Li, Xun Zhan, Weicheng Zhong, Benjamin Sutton, Brent Heuser
|On-Site Speaker (Planned)
Selective irradiation behaviors in proton irradiated dual phase 308L filler of 508-304 weldment were investigated by advanced characterization techniques. Ni-Si enriched clusters were observed under SEM, TEM, STEM-EDS, HR-STEM and APT in proton irradiated γ austenite, while G phase M6Ni16Si7 precipitates were seen in δ ferrite. Compositional analysis on G phase and Ni-Si cluster with STEM-EDS and APT data was compared. APT can yield accuracy results while analyzing nano-sized point of interest. Unlike G phase in proton irradiated δ ferrite, Ni-Si cluster in proton irradiated γ austenite is not rich in Mn. Both STEM-EDS and APT line-scan profiles on Ni-Si cluster showed that the Fe and Cr concentration variation between matrix γ austenite and Ni-Si cluster is not as sharp as those between matrix δ ferrite and G phase. Further, HR-STEM imaging indicated that the lattice parameter of these Ni-Si enriched cluster is coherent to that of γ austenite.