NSUF 11-264: Synchrotron X-ray Diffraction Study of Microstructural Evolution in Irradiated Mod.9Cr-1Mo Steel
The purpose of this project is to characterize phase stability and lattice strain evolution under irradiation in mod.9Cr-1Mo ferritic-martensitic steel using synchrotron x-ray diffraction (XRD). Ferriticmartensitic steels are the lead structural materials for all types of advanced fission and fusion energy systems. These alloys have excellent resistance to irradiation-induced swelling, good thermal properties, and low cost. Mod.9Cr-1Mo ferritic-martensitic steel is a prime candidate for structural applications in advanced sodium-cooled fast reactors. Mod.9Cr-1Mo is a Fe-9%Cr-1%Mo steel modified with V and Nb. Prior to irradiation, the microstructure of the alloy consisted of tempered martensite stabilized by M23C6 carbides and a fine distribution of vanadium/niobium carbon-nitride (MX) precipitates, giving rise to superior high temperature strength. Irradiation can significantly change the initial optimum microstructure and degrade the mechanical performance of the alloy. Previous electron microscopy study indicated carbide amorphization and/or nanocrystallinity in irradiated Mod.9Cr-1Mo steel; synchrotron x-ray absorption spectroscopy (XAS) measurements showed significant reduction in coordination in C/N and Nb, Cr shells with increasing irradiation doses. To fully understand the effect of irradiation on microstructural evolution in this alloy, synchrotron XRD experiments are proposed to characterize phase changes and strain evolution and their dependence of irradiation dose
Additional Info
| Field | Value |
|---|---|
| Abstract | The purpose of this project is to characterize phase stability and lattice strain evolution under irradiation in mod.9Cr-1Mo ferritic-martensitic steel using synchrotron x-ray diffraction (XRD). Ferriticmartensitic steels are the lead structural materials for all types of advanced fission and fusion energy systems. These alloys have excellent resistance to irradiation-induced swelling, good thermal properties, and low cost. Mod.9Cr-1Mo ferritic-martensitic steel is a prime candidate for structural applications in advanced sodium-cooled fast reactors. Mod.9Cr-1Mo is a Fe-9%Cr-1%Mo steel modified with V and Nb. Prior to irradiation, the microstructure of the alloy consisted of tempered martensite stabilized by M23C6 carbides and a fine distribution of vanadium/niobium carbon-nitride (MX) precipitates, giving rise to superior high temperature strength. Irradiation can significantly change the initial optimum microstructure and degrade the mechanical performance of the alloy. Previous electron microscopy study indicated carbide amorphization and/or nanocrystallinity in irradiated Mod.9Cr-1Mo steel; synchrotron x-ray absorption spectroscopy (XAS) measurements showed significant reduction in coordination in C/N and Nb, Cr shells with increasing irradiation doses. To fully understand the effect of irradiation on microstructural evolution in this alloy, synchrotron XRD experiments are proposed to characterize phase changes and strain evolution and their dependence of irradiation dose |
| Award Announced Date | 2011-01-19T00:00:00 |
| Awarded Institution | None |
| Facility | None |
| Facility Tech Lead | Jeff Terry |
| Irradiation Facility | None |
| PI | Meimei Li |
| PI Email | [email protected] |
| Project Type | APS |
| RTE Number | 264 |