NSUF 10-265: Multi-scale Investigation of the Influence of Grain Boundary Character on RIS and Mechanical Behavior in LWR Steels

Using a combination of high resolution microscopy (TEM and local electrode atom probe (LEAP)) techniques, solute segregation and precipitation in steel alloys relevant to LWRs (from the sample library) will be investigated, as a function of grain boundary character (GBC). A streamlined process: EBSD->FIB->TEM->LEAP. The process is able to look at the structure and composition in the same area or interface. This technique will be used to assess solute and precipitate location and chemistry at specific orientations for the samples. The prospective benefit of this study is to truly understand dose rate, temperature, and composition effects from existing irradiated materials in the INL library to serve as a “real-life” compliment for ongoing experimental work in austenitic alloys. The INL test samples will be chosen according to how similarly their history is to the samples in the proposed work. Similar conditions have been repeated during in situ irradiation/heating/straining TEM experiments at Argonne National Laboratorys IVEM facility. These experiments will be a first-ever multi-scale examination of the effect of specific grain boundary character distributions (and particular orientations/boundary planes) on mitigating the negative effects on mechanical behavior as a result of radiation induced segregation.

Additional Info

Field	Value
Abstract	Using a combination of high resolution microscopy (TEM and local electrode atom probe (LEAP)) techniques, solute segregation and precipitation in steel alloys relevant to LWRs (from the sample library) will be investigated, as a function of grain boundary character (GBC). A streamlined process: EBSD->FIB->TEM->LEAP. The process is able to look at the structure and composition in the same area or interface. This technique will be used to assess solute and precipitate location and chemistry at specific orientations for the samples. The prospective benefit of this study is to truly understand dose rate, temperature, and composition effects from existing irradiated materials in the INL library to serve as a “real-life” compliment for ongoing experimental work in austenitic alloys. The INL test samples will be chosen according to how similarly their history is to the samples in the proposed work. Similar conditions have been repeated during in situ irradiation/heating/straining TEM experiments at Argonne National Laboratorys IVEM facility. These experiments will be a first-ever multi-scale examination of the effect of specific grain boundary character distributions (and particular orientations/boundary planes) on mitigating the negative effects on mechanical behavior as a result of radiation induced segregation.
Award Announced Date	2010-06-09T00:00:00
Awarded Institution	Idaho National Laboratory
Facility	Advanced Test Reactor
Facility Tech Lead	Alina Zackrone, Kevin Field, Yaqiao Wu
Irradiation Facility	None
PI	Mitra Taheri
PI Email	[email protected]
Project Type	PIE Only
RTE Number	265