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藤井 克彦1,*,福 谷 耕司1,中 島 宣雄1 Evaluation of Surface Oxidation Mechanism of Alloy 600 in a Simulated Primary Water of Pressurized Water Reactors using Analytical Transmission Electron Microscopy Katsuhiko FUJII, Koji FUKUYA and Nobuo NAKAJIMA High resolution TEM observations onsurface oxide layers and uncracked grain boundaries intersected by the surface were carried out on alloy 600 exposed to simulated primary water environment of pressurized water reactors. A focused-ion beam micro-processing has been applied to prepare lectron transparent foils for the cross-sectional surface observations. The surface oxide layer contained two different layers. The outer layer consisted of granular NiFe2O4 covered by NiO. The inner layer consisted of Cr rich oxides such as Cr2O3 and (Cr, Fe)3O4 and a metallic Ni phase. It is suggested that selective oxidation ofchromium occurs in the inner layer. The observations that oxygen penetrated along the uncracked grain boundaries intersected by the surface indicated a larger diffusivity ofoxygen in the stressed gain boundaries than that in the matrix. These results uggested the following model for the growth of the oxide double layer: the outer layer is formed by a metal dissolution a d oxide precipitation mechanism, and the inner layer is formed by an oxygen ion diffusion mechanism.

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Evaluation of Surface Oxidation Mechanism of Alloy 600 in a Simulated Primary Water of Pressurized Water Reactors using Analytical Transmission Electron Microscopy