EFFECT OF Nb ON THE CORROSION RESISTANCE OF Zr-4 ALLOY IN SUPERHEATED STEAM AT 500 ℃

doi:10.3724/SP.J.1037.2011.00106

Acta Metall Sin

2011, Vol. 47

Issue (7): 865-871 DOI: 10.3724/SP.J.1037.2011.00106

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EFFECT OF Nb ON THE CORROSION RESISTANCE OF Zr-4 ALLOY IN SUPERHEATED STEAM AT 500 ℃

YAO Meiyi, LI Shilu, ZHANG Xin, PENG Jianchao, ZHOU Bangxin, ZHAO Xushan, SHEN Jianyun

1) Institute of Materials, Shanghai University, Shanghai 200072
2) Laboratory for Microstructures, Shanghai University, Shanghai 200444
3) General Research Institute for Nonferrous Metal, Beijing 100088

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YAO Meiyi LI Shilu ZHANG Xin PENG Jianchao ZHOU Bangxin ZHAO Xushan SHEN Jianyun. EFFECT OF Nb ON THE CORROSION RESISTANCE OF Zr-4 ALLOY IN SUPERHEATED STEAM AT 500 ℃. Acta Metall Sin, 2011, 47(7): 865-871.

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Abstract The corrosion resistance of Zr-4+xNb alloys (x=0.1-0.3, mass fraction, %) was investigated in a superheated steam at 500 ℃ and 10.3 MPa by autoclave tests. The microstructure of the alloys and fracture surface morphology of the oxide film formed on the alloys were observed by TEM and SEM, respectively. Results show that no nodular corrosion appears on Zr-4+xNb alloys in 500 ℃/10.3 MPa superheated steam even for 500 h, which is related to the higher Nb concentration dissolved in α-Zr matrix. The Nb dissolved in α-Zr matrix can restrain the nucleation of nodular corrosion, thus improve the nodular corrosion resistance. The uniform corrosion resistance of Z-4+xNb alloys is lowered with the increase of Nb content, which is related to the decrease of the solid solution concentration of (Fe+Cr) in α-Zr matrix and the precipitation of the second phase particles of Zr(Fe, Cr, Nb)₂, and the two aspects will accelerate the microstructural evolution of the oxide film during corrosion process to promote the formation of pores and micro-cracks.

Key words: zirconium alloy Nb nodular corrosion microstructure

Received: 03 March 2011

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Supported by National Natural Science Foundation of China (Nos.50871064 and 50971084), High Technology Research and Development Program of China (No.2008AA031701), Natural Science Foundation of Shanghai (No.09ZR1411700) and Shanghai Leading Academic Discipline Project (No.S30107)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00106 OR https://www.ams.org.cn/EN/Y2011/V47/I7/865

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