MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
 
Diffusivity and Solubility of Cu in a Reactor Pressure Vessel Steel Studied by Atom Probe Tomography
Masaki ShimodairaTakeshi ToyamaFumihiko TakahamaNaoki EbisawaYasuko NozawaYasuo ShimizuKoji InoueYasuyoshi Nagai
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2014 Volume 55 Issue 9 Pages 1460-1463

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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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© 2014 The Japan Institute of Metals and Materials
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