Abstract
The microstructure, the corrosion behavior and the oxide properties were examined for Zr-1.5Nb-0.4Sn-0.2Fe-0.1Cr (HANA-4) alloys which were subjected to two different final annealing temperatures: 470°C and 570°C. HANA-4 was shown to have s-enriched phase with a bcc crystal structure and Zr(Nb,Fe,Cr)₂ with a hcp crystal structure with s-enriched phase being more frequently observed compared with Zr(Nb,Fe,Cr)₂. The corrosion rate of HANA-4 was increased with an increase of the final annealing temperature in the PWR-simulating loop, 360°C pure water and 400°C steam conditions, which was correlated well with a reduction in the size of the columnar grains in the oxide/metal interface region. The oxide growth rate of HANA-4 was considerably affected by the alloy microstructure determined by the final annealing temperature.
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