| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments
|
| Presentation Title |
Selective Irradiation Behavior in Dual Phase 308L Filler of SA508-304L Dissimilar Metal Weldment after Proton Irradiation |
| Author(s) |
Zhen Li, Xun Zhan, Weicheng Zhong, Benjamin Sutton, Ovidiu Toader, Gary Was, Brent Heuser |
| On-Site Speaker (Planned) |
Zhen Li |
| Abstract Scope |
Selective irradiation behaviors in mixed phase 308L filler of 508-304 DWM after proton irradiation were investigated to a depth of 0 to 10 µm. Ni-Si-Mn enriched precipitates were observed under SEM and TEM in δ ferrite, which is possibly attributed to the much higher diffusivity of solute elements in δ ferrite. STEM-EDS, TEM dark field imaging and diffraction patterns confirmed that these Ni-Si-Mn enriched precipitates were Mn6Ni16Si7. Voids were observed in γ austenite. The higher thermal expansion coefficient and faster void swelling rate of γ austenite might be responsible for its susceptible to the formation of voids. Ni-Si enriched clusters were detected at the edges of voids. However, diffraction patterns from the γ austenite, where containing voids, did not reveal the evidence of second phase. Therefore, these Ni-Si enriched clusters might be precursors of Ni-Si precipitates. In addition, irradiated induced Cr depletion, Si and Ni enrichment at γ austenite grain boundaries were detected under STEM/EDS. |