|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||Thermal Aging and Low Dose Neutron Irradiation Effect on the Microstructural Stability of Delta Ferrite in a 308L Weld
||Zhangbo Li, Yong Yang, Yiren Chen
|On-Site Speaker (Planned)
The integrity of reactor internal components made of austenitic stainless steel welds with a duplex structure can potentially be affected by both thermal aging and neutron irradiation induced embrittlement. In this study, the thermal aging was performed at 400°C for up to 2,220 hours on a 308L weld, and the irradiation was conducted in the Halden reactor at ~315°C to 0.08 dpa. Precipitation and spinodal decomposition were both observed in the thermally aged and neutron irradiated 308L weld by using a transmission electron microscopy and atom probe tomography. As compared with thermal aging, low dose neutron irradiation induced a slightly more significant spinodal decomposition. The G-phase precipitates in irradiated ferrite phase also show a larger mean size, a wider size distribution, but a lower number density as compared with those in thermal aged ferrite phase. In addition, the resulted embrittlement in the ferrite phase was also evaluated using micro/nano-indentation tests.
||Planned: A print-only volume