NSUF 18-1520: Investigation of the Tensile-Deformed Microstructure of a Neutron-Irradiated Type 316 Stainless Steel Specimen

TEM investigation will be performed on a tensile-deformed Type 316 stainless steel (ss) specimen irradiated in the BOR-60 reactor to 11.8 dpa at 315 C. The tensile test was conducted at room temperature with in-situ high-energy x-ray diffraction measurements, which revealed the progression of a "deformation wave" accompanied by martensitic phase transformation. TEM samples from different regions of interest will be prepared by the focused ion beam (FIB) lift-out method, including the deformed region (away from necking center), the undeformed region, the transition region, and the necking center. The TEM investigation will focus on irradiation defects and their role in plasticity. The mechanism of martensitic transformation and the role of other microstructural features (such as precipitates, twins, etc.) will also be evaluated. The TEM results will be used in combination with in-situ x-ray diffraction results to gain a complete understanding of the complex deformation behavior in this neutron-irradiated specimen, providing insights to irradiation hardening and embrittlement mechanisms.

Additional Info

Mező	Érték
Awarded Institution	Argonne National Laboratory
Embargo End Date	2020-08-18
Facility Tech Lead	Mukesh Bachhav
NSUF Call	FY 2018 RTE 3rd Call
PI	Xuan Zhang
Project Member	Meimei Li - Argonne National Laboratory
Project Member	Dr. Xuan Zhang, Principal Materials Scientist - Argonne National Laboratory (https://orcid.org/0000-0002-5690-459X)
Project Member	Yiren Chen - Argonne National Laboratory (https://orcid.org/0000-0002-4153-1532)
Project Notes	Awarded on 9/17/2018
Project Type	RTE
RTE Number	1520