NSUF 16-643: Effect of Neutron Irradiation on Tensile Deformation of a HT-UPS Stainless Steel
It is proposed to conduct microstructural characterization on a tensile-deformed, neutron-irradiated high-temperature ultrafine-precipitate-strengthened (HT-UPS) steel sample using the FIB sampling and TEM/APT analyzing capabilities at MaCS/CAES. The HT-UPS sample was neutron irradiated to 3dpa at 400°C in ATR, and was in-situ strained to fracture with simultaneous characterization using high energy X-ray scattering techniques at the APS, ANL. TEM and APT analysis of the deformed tensile specimen will provide complementary information to the in situ X-ray experiment to further understand the effect of neutron irradiation on deformation and failure mechanisms of the alloy. Location specific TEM lamella specimens representing different deformation stages including as-irradiated and undeformed state, uniform deformation state, and necking stage, will be prepared from each corresponding locations on the HT-UPS steel fractured tensile specimen. The as-irradiated microstructure and deformed microstructures will be characterized using the Tecnai TEM. The location-specific deformation structures, such as the dislocation densities, will be quantified and correlated with relevant X-ray diffraction analysis, to get a complete understanding of the deformation characteristics of this material. APT tips will be made from the as-irradiated and deformed regions to study the radiation- and deformation-induced elemental segregation and precipitation. This project is fully aligned with the DOE-NE’s missions via supporting the advanced reactor concepts (ARC), advanced small modular reactors (aSMR), and nuclear energy advanced modeling and simulations (NEAMS) programs. The proposed period of experiment is 3 days of FIB, 2 days of Tecnai TEM, and 4 days of LEAP. The research will be completed within six months after the proposal is approved.
Additional Info
| Field | Value |
|---|---|
| Abstract | It is proposed to conduct microstructural characterization on a tensile-deformed, neutron-irradiated high-temperature ultrafine-precipitate-strengthened (HT-UPS) steel sample using the FIB sampling and TEM/APT analyzing capabilities at MaCS/CAES. The HT-UPS sample was neutron irradiated to 3dpa at 400°C in ATR, and was in-situ strained to fracture with simultaneous characterization using high energy X-ray scattering techniques at the APS, ANL. TEM and APT analysis of the deformed tensile specimen will provide complementary information to the in situ X-ray experiment to further understand the effect of neutron irradiation on deformation and failure mechanisms of the alloy. Location specific TEM lamella specimens representing different deformation stages including as-irradiated and undeformed state, uniform deformation state, and necking stage, will be prepared from each corresponding locations on the HT-UPS steel fractured tensile specimen. The as-irradiated microstructure and deformed microstructures will be characterized using the Tecnai TEM. The location-specific deformation structures, such as the dislocation densities, will be quantified and correlated with relevant X-ray diffraction analysis, to get a complete understanding of the deformation characteristics of this material. APT tips will be made from the as-irradiated and deformed regions to study the radiation- and deformation-induced elemental segregation and precipitation. This project is fully aligned with the DOE-NE’s missions via supporting the advanced reactor concepts (ARC), advanced small modular reactors (aSMR), and nuclear energy advanced modeling and simulations (NEAMS) programs. The proposed period of experiment is 3 days of FIB, 2 days of Tecnai TEM, and 4 days of LEAP. The research will be completed within six months after the proposal is approved. |
| Award Announced Date | 2016-04-11T00:00:00 |
| Awarded Institution | North Carolina State University |
| Facility | Nuclear Reactor Program - PULSTAR |
| Facility Tech Lead | Ayman Hawari , Yaqiao Wu |
| Irradiation Facility | None |
| PI | Chi Xu |
| PI Email | [email protected] |
| Project Type | RTE |
| RTE Number | 643 |