Diffusivity and Solubility of Cu in a Reactor Pressure Vessel Steel Studied by Atom Probe Tomography

Masaki Shimodaira; Takeshi Toyama; Fumihiko Takahama; Naoki Ebisawa; Yasuko Nozawa; Yasuo Shimizu; Koji Inoue; Yasuyoshi Nagai

doi:10.2320/matertrans.MAW201410

Masaki Shimodaira, Takeshi Toyama, Fumihiko Takahama, Naoki Ebisawa, Yasuko Nozawa, Yasuo Shimizu, Koji Inoue, Yasuyoshi Nagai

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Masaki Shimodaira
International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University
Takeshi Toyama
International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University
Fumihiko Takahama
International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University
Naoki Ebisawa
International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University
Yasuko Nozawa
International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University
Yasuo Shimizu
International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University
Koji Inoue
International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University
Yasuyoshi Nagai
International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University

Keywords: copper diffusion, reactor pressure vessel steel, diffusivity, solubility limit, grain boundary diffusion, atom probe tomography

JOURNAL FREE ACCESS

2014 Volume 55 Issue 9 Pages 1460-1463

DOI https://doi.org/10.2320/matertrans.MAW201410

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J-STAGE : matertrans 56 9 pp.1513-1516

J-STAGE : matertrans 56 9 pp.1613-1613

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Abstract

The diffusivity and solubility limit of Cu in A533B steel, which is used in reactor pressure vessels, were studied by atom probe tomography (APT). Cu-A533B steel diffusion couples were annealed at temperatures of 550, 600, and 700°C, and the resulting Cu concentration profiles were measured. For all annealing temperatures, the diffusivity of Cu in A533B steel were found to be 2–3 times higher than that in pure Fe, although the solubility limit of Cu was similar. APT was also used to study the effect of the grain boundary (GB) diffusion. The results indicated that no Cu segregation occurred at GB near the Cu/A533B steel interface, which may imply that GB diffusion of Cu was not effective in A533B steel.

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