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EFFECT OF Bi ADDITION ON THE CORROSION RESISTANCE OF Zr-4 IN SUPERHEATED STEAM AT 400 ℃/10.3 MPa |
YAO Meiyi1, 2), ZOU Linghong1, 2), XIE Xingfei1, 2), ZHANG Jinlong1, 2), PENG Jianchao1, 2), ZHOU Bangxin1, 2) |
1) Laboratory for Microstructures, Shanghai University, Shanghai 200444
2) Institute of Materials, Shanghai University, Shanghai 200072 |
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Cite this article:
YAO Meiyi ZOU Linghong XIE Xingfei ZHANG Jinlong PENG Jianchao ZHOU Bangxin. EFFECT OF Bi ADDITION ON THE CORROSION RESISTANCE OF Zr-4 IN SUPERHEATED STEAM AT 400 ℃/10.3 MPa. Acta Metall Sin, 2012, 48(9): 1097-1102.
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Abstract The effect of Bi contents on the corrosion resistance of Zr-4+xBi (x=0.1%-0.5%, mass fraction)
alloys, which were prepared by adding Bi to Zr-4, was investigated in superheated steam at 400 ℃ and
10.3 MPa by autoclave tests. The microstructures of the alloys and fracture surface morphology of the oxide film
formed on the alloys were observed by TEM, EDS and SEM. The results show that with the increase of Bi content,
the second phase particles (SPPs) are almost the same in size and shape, but increase in amount and vary in
composition, including Zr(Fe, Cr)2, Zr-Fe-Cr-Bi, Zr-Fe-Sn-Bi and Zr-Fe-Cr-Sn-Bi. Even in the
Zr-4+0.1Bi alloy, Bi--containing SPPs were detected. This indicates that the solid solubility of Bi in α-Zr
matrix of Zr-4+xBi alloys is less than 0.1% at 580 ℃. Moreover, the addition of Bi promotes the precipitation
of Sn which originally dissolved in the α-Zr matrix of Zr-4. Compared with Zr-4, the addition
of Bi makes the corrosion resistance worse, and it becomes more obvious with the increase of Bi content. This
illustrates that the addition of Bi can not improve the corrosion resistance, on the contrary, it brings a harmful
influence. This may be related to the precipitation of the Bi-containing and Bi-Sn-containing SPPs.
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Received: 06 April 2012
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Fund: Supported by National Natural Science Foundation of China (No.50971084), National Advanced Pressurized Water Reactor Project of China (No.2011ZX06004-023) and Shanghai Leading Academic Discipline Project (No.S30107) |
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