| To investigate the effects of Nb content and annealing parameter on corrosion resistance in Zr-0.8Sn-0.4Fe-0.2Cr-xNb(x=0.1, 0.2, 0.4, 0.8%) alloys, corrosion tests have been carried out under the 400℃ steam condition. The corrosion resistance of the alloys decreased with increasing the Nb content and the accumulated annealing parameter. But the Nb content in precipitates and the hydrogen pick-up fraction in matrix increased when the adding Nb content and the accumulated annealing parameter increased. The fraction of t-ZrO_2 in oxide layers decreased with increasing the accumulated annealing parameter. It was concluded that the corrosion resistance of Zr-0.8Sn-0.4Fe-0.2Cr-xNb alloys could be controlled by the characteristics of (Zr, Nb)(Fe, Cr)_2 type precipitates with the variation of the Nb content and the accumulated annealing parameter. |
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