CORROSION RESISTANCE OF Zr-0.72Sn-0.32Fe- 0.14Cr-xNb ALLOYS IN 500 ℃ SUPERHEATED STEAM

doi:10.11900/0412.1961.2015.00254

Acta Metall Sin

2015, Vol. 51

Issue (12): 1545-1552 DOI: 10.11900/0412.1961.2015.00254

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CORROSION RESISTANCE OF Zr-0.72Sn-0.32Fe- 0.14Cr-xNb ALLOYS IN 500 ℃ SUPERHEATED STEAM

Boyang WANG¹,Bangxin ZHOU^1,²(

),Zhen WANG¹,Jiao HUANG¹,Meiyi YAO^1,²,Jun ZHOU³

1 Institute of Materials, Shanghai University, Shanghai 200072
2 Laboratory for Microstructures, Shanghai University, Shanghai 200444
3 Western Energy Material Technologies Co. Ltd., Xi'an 710016

Cite this article:

Boyang WANG,Bangxin ZHOU,Zhen WANG,Jiao HUANG,Meiyi YAO,Jun ZHOU. CORROSION RESISTANCE OF Zr-0.72Sn-0.32Fe- 0.14Cr-xNb ALLOYS IN 500 ℃ SUPERHEATED STEAM. Acta Metall Sin, 2015, 51(12): 1545-1552.

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Abstract

Zirconium alloys with low alloying content are mainly used in the nuclear industry as structural materials because of their superior properties in terms of thermal neutron transparency, mechanical strength and corrosion resistance. They are used for fuel cladding tubes and channels. The reaction between zirconium and water at high temperature forms oxide film on the surfaces. In order to further improve the corrosion resistance of Zr-based cladding tubes, research has continued on developing new zirconium alloys. The corrosion resistance of Zr-0.72Sn-0.32Fe-0.14Cr-xNb alloys (x=0, 0.12, 0.28, 0.48, 0.97, mass fraction, %) was investigated in a superheated steam at 500 ℃ and 10.3 MPa by autoclave tests. All the plate specimens of zirconium alloys with thickness of 2.8 mm have a similar texture. The microstructure of alloys and oxide films on the corroded specimens were observed by TEM and SEM. The results showed that no nodular corrosion appeared on these alloys for 500 h exposure. The thickness of oxide layers developed on the rolling surface (S_N), the surface perpendicular to the rolling direction (S_R) and the surface perpendicular to the transversal direction (S_T) after 500 h exposure was close to each other. There was no anisotropic corrosion resistance for these alloys. The corrosion rate of the alloys increased with the increase of Nb content after 250 h exposure when the Nb content exceeded 0.28%. In the alloy with low Nb content, the fcc-Zr(Fe, Cr)₂ or fcc-Zr(Fe, Cr, Nb)₂ precipitate was mainly formed, while the hcp-Zr(Fe, Cr, Nb)₂ precipitate was frequently observed in the alloy with high Nb content. The corrosion resistance of Zr-0.72Sn-0.32Fe-0.14Cr-xNb alloys was improved by decreasing the Nb/Fe ratio. From a point of view for the improving corrosion resistance, the addition of Nb no more than 0.3% is recommended.

Key words: zirconium alloy Nb second phase corrosion resistance

Fund: Supported by National Natural Science Foundation of China (No.51471102)

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	Boyang WANG
	Bangxin ZHOU
	Zhen WANG
	Jiao HUANG
	Meiyi YAO
	Jun ZHOU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00254 OR https://www.ams.org.cn/EN/Y2015/V51/I12/1545

Fig.1 (0001) pole figure (a), inverse pole figures of the normal direction (ND) to rolling surface (b), transversal direction (TD) (c) and rolling direction (RD) (d) of 0.97Nb alloy annealed at 580 ℃ for 5 h

Table 1 Texture factors f_N, f_R and f_T in ND, RD and TD for Zr-0.72Sn-0.32Fe-0.14Cr-xNb alloys

Fig.2 TEM images of 0Nb (a), 0.12Nb (b) and 0.97Nb (c) alloys

Fig.3 TEM images and SAED patterns (insets) of second phase particles 1~3 in 0Nb (a), 0.12Nb (b) and 0.97Nb (c) alloys

Fig.4 Mass gain curves of Zr-0.72Sn-0.32Fe-0.14Cr-xNb alloys corroded in 500 ℃, 10.3 MPa superheated steam for different times

Fig.5 Variation of average corrosion rate of Zr-0.72Sn-0.32Fe-0.14Cr-xNb alloys with Nb contents after corrosion for 250~500 h

Fig.6 Fracture surface morphologies of oxide films formed on S_N surface (rolling surface) after exposed in 500 ℃, 10.3 MPa superheated steam for 500 h for 0Nb (a), 0.28Nb (b) and 0.97Nb (c) alloys

Fig.7 Oxide thickness on rolling surface (S_N), surface perpendicular to rolling direction (S_R) and surface perpendicular to transversal direction (S_T) as a function of exposure time for 0Nb (a), 0.12Nb (b), 0.28Nb (c), 0.48Nb (d) and 0.97Nb (e) alloys corroded in 500 ℃, 10.3 MPa superheated steam

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