Abstract
An atom probe tomography characterization has been performed on a neutron-irradiated (fluence = 0.8 × 10 19 n cm -2 (E > 1 MeV)) high copper (0.37%), high manganese (1.64%), high nickel (1.23%) and high chromium (0.47%) KS-01 test weld. This weld exhibited a high sensitivity to neutron irradiation. Atom probe tomography revealed that there was an unusually high supersaturation of copper in the matrix after the stress relief treatment, which resulted in a high number density (3 × 10 24 m -3 ) of Cu-Mn-Ni-enriched precipitates after neutron irradiation. Their average size and composition were estimated to be 〈 l g〉 = 2.6 0.5 nm and Fe-17.0 9.7 at% Cu, 31.9 13.8% Ni, 31.7 11.8% Mn. Phosphorus clusters and a Cr-, Mn-, Ni-, Cu-, C-, N-, Si- and Mo-enriched atmosphere, possibly associated with a dislocation, were also observed in the neutron irradiated material. Nickel, manganese, silicon, phosphorus and carbon segregation to a grain boundary were observed in the unirradiated condition. The microstructural and mechanical response to irradiation was consistent with other lower solute level steels.
Original language | English |
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Pages (from-to) | 401-408 |
Number of pages | 8 |
Journal | Philosophical Magazine |
Volume | 85 |
Issue number | 4-7 SPEC. ISS. |
DOIs | |
State | Published - Feb 2005 |
Funding
Research at the Oak Ridge National Laboratory SHaRE Collaborative Research Center was sponsored by the Division of Materials Sciences and Engineering, U.S. Department of Energy, under contract DE-AC05-00OR22725 with UT-Battelle, LLC and by the Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission under inter-agency agreement DOE 1886-N695-3W with the U.S. Department of Energy.