The Effect of Heat Treatment on Mechanical and Corrosion Performances of Zr-Nb Alloy

Abstract:

The mechanical performance and corrosion resistance of Zr-Nb alloy (Zr705) treated in different ways is tested, and it is found that those properties of Zr-Nb alloy are significantly affected by heat treatment. The most important parameter of the heat treatment is quenching temperature. The Zr-Nb alloy, quenched below the critical quenching temperature Tcq (a temperature or a range of temperature between 850°C-870°C) presents good corrosion resistance performance, however, quenched above the Tcq gets a higher strength and a lower corrosion resistance. Through the study on the basis of the evidences gotten by means of metallographic, SEM, EPMA and TEM, the conclusion can be drawn as that the effect of heat treatment on the performances of Zr-Nb alloy is primarily because of the mechanism of the distribution change of Nb, the quantity of β-Zr, the morphology of grains. Keywords: Zr-Nb alloy, heat treatment, β-Zr, twins

• Periodical: Materials Science Forum (Volumes 704-705)
• Pages: 325-336
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.704-705.325
• Online since: December 2011
• Authors: Xiao Lei Yang, De Wei Deng, Yong Wang, Yan Liu Ge
• Keywords: Heat Treatment, Twins, Zr-Nb Alloy, β-Zr

References

[1] J.H. Baek, Y.H. Jeong, and I.S. Kim: Effects of the accumulated annealing parameter on the corrosion characteristics of a Zr-0. 5Nb-1. 0Sn-0. 5Fe-0. 25Cr alloy. Journal of Nuclear Materials Vol. 280 (2000), p.235.

DOI: 10.1016/s0022-3115(99)00288-3

[2] M.Y. Yao, B.X. Zhou, Q. Li, W.Q. Liu, and Y.L. Chu: A single-specimen-method for investigating effect of alloying composition on corrosion resistance of zirconium alloys. Rare Metal Mat. Eng. Vol. 35 (2006), p.1651.

[3] M.Y. Yao, B.X. Zhou, Q. Li, W.Q. Liu, and Y.L. Chu: The effect of alloying modifications on hydrogen uptake of zirconium-alloy welding specimens during corrosion tests. Journal of Nuclear Materials Vol. 350 (2006), p.195.

DOI: 10.1016/j.jnucmat.2005.12.005

[4] L. Qiang, Z. Bangxin, Y. Meiyi, L. Wenqing, and C. Yuliang: Corrosion Behavior of zirconium alloys in Supercritical water at 550 degrees C and 25 MPa. Rare Metal Mat. Eng. Vol. 36 (2007), p.1358.

[5] M.Y. Yao, B.X. Zhou, Q.A. Li, W.Q. Liu, S.A. Wang, and X.S. Huang: Effect of the second phase particles on the hydrogen absorption of Zircaloy-4 alloy corroded in super-heated steam of 400 degrees C. Rare Metal Mat. Eng. Vol. 36 (2007), p. (1915).

[6] M.Y. Yao, B.X. Zhou, Q.A. Li, W.Q. Liu, W.J. Yu, and Y.L. Chu: Effect of heat treatments on the corrosion resistance of Zircaloy-4 in LiOH aqueous solution at 360 degrees C/18. 6 MPa. Rare Metal Mat. Eng. Vol. 36 (2007), p. (1920).

[7] B.X. Zhou, Q.A. Li, M.Y. Yao, S.A. Xia, W.Q. Liu, and Y.L. Chu: Effect mechanism of heat treatments on nodular corrosion resistance of Zircaloy-4. Rare Metal Mat. Eng. Vol. 36 (2007), p.1129.

[8] M.Y. Yao, B.X. Zhou, Q. Li, W.Q. Liu, X. Geng, and Y.P. Lu: A superior corrosion behavior of Zircaloy-4 in lithiated water at 3 60 degrees C/18. 6 MPa by beta-quenching. Journal of Nuclear Materials Vol. 374 (2008), p.197.

DOI: 10.1016/j.jnucmat.2007.08.002

[9] W.Q. Liu, B.X. Zhou, and Q. Li: Corrosion resistance of Zr-1Nb alloy in lithium hydroxide aqueous solution. Rare Metals Vol. 20 (2001), p.78.

[10] W.Q. Liu, Q. Li, B.X. Zhou, and M.Y. Yao: The effect of water chemistry on compressive stress at interface of oxide/matrix of zircaloy-4. Rare Metal Mat. Eng. Vol. 33 (2004), pp.1112-1115.

[11] H.J. Gonzalez and D.C. Dunand: Transformation superplasticity in Zircadyne 705. Journal of Materials Engineering and Performance Vol. 13 (2004), p.665.

DOI: 10.1361/10599490421268

[12] W.Q. Liu, Q.A. Li, B.X. Zhou, Q.S. Yan, and M.Y. Yao: Effect of heat treatment on the microstructure and corrosion resistance of a Zr-Sn-Nb-Fe-Cr alloy. Journal of Nuclear Materials Vol. 341 (2005), p.97.

DOI: 10.1016/j.jnucmat.2005.01.007