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Corrosion behavior of four oxide dispersion strengthened(ODS) ferritic alloys exposed in thermal convective liquid sodium loop for 4 000 h was examined.Surface observation results reveal that coral-like surfaces with deposit initially formed on surfaces of all exposed specimens.In tested alloy S2,χ-phase precipitated in specimen center,and a depleted χ- phase zone formed near the specimen surface.There is a transition area between the surface and center.In the other tested alloys,no notable change on microstructure was observed.Grain boundary attack was not found in any of the tested specimens.Tensile test results indicate that sodium corrosion of the four ODS ferritic alloys for 3 000 h had no notable effect on their tensile properties.
Corrosion behavior of four oxide dispersion strengthened (ODS) ferritic alloys exposed in thermal convective liquid sodium loop for 4 000 h was examined. Surface observation results reveal that coral-like surfaces with deposit initially formed on surfaces of all exposed specimens. In the tested alloy S2 , χ-phase precipitated in specimen center, and a depleted χ-phase zone formed near the specimen surface. There is a transition area between the surface and center. the other tested alloys, no not change change on microstructure was observed. Grain boundary attack was not found in any of the tested specimens. Sensile test results indicate that sodium corrosion of the four ODS ferritic alloys for 3 000 h had no not effect on their tensile properties.