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显微组织对Zr-Sn-Nb合金耐腐蚀性能的影响

显微组织对Zr-Sn-Nb合金耐腐蚀性能的影响[J]. 原子能科学技术, 2003, 37(S1): 140-140. DOI: 10.7538/yzk.2003.37.S1.0140
引用本文: 显微组织对Zr-Sn-Nb合金耐腐蚀性能的影响[J]. 原子能科学技术, 2003, 37(S1): 140-140. DOI: 10.7538/yzk.2003.37.S1.0140
LIU Wen-qing,LI Qiang,YAO Mei-yi,ZHOU Bang-xin (Institute of Materials, Shanghai University, Shanghai 200072, China). Effect of the Microstructure on the Corrosion Resistance of Zr-Sn-Nb Alloy[J]. Atomic Energy Science and Technology, 2003, 37(S1): 140-140. DOI: 10.7538/yzk.2003.37.S1.0140
Citation: LIU Wen-qing,LI Qiang,YAO Mei-yi,ZHOU Bang-xin (Institute of Materials, Shanghai University, Shanghai 200072, China). Effect of the Microstructure on the Corrosion Resistance of Zr-Sn-Nb Alloy[J]. Atomic Energy Science and Technology, 2003, 37(S1): 140-140. DOI: 10.7538/yzk.2003.37.S1.0140

显微组织对Zr-Sn-Nb合金耐腐蚀性能的影响

详细信息
  • 中图分类号: TG156;TG146.41

  • 摘要: 将两种Zr-Sn-Nb合金样品分别进行1000℃-0.5 h、1000℃-0.5 h/560℃-10 h、1000℃-0.5 h/冷轧/560℃-10 h和750℃-0.5 h、750℃-0.5 h/560℃-10 h、750℃-0.5 h/冷轧/560℃-10 h的不同处理后,研究它们的显微组织和在350℃、16.8 MPa、0.04 mol·L~(-1)LiOH水溶液中的耐腐蚀性能。结果表明:在所采用的上述变形及热处理条件中,以750℃-0.5 h/冷轧/560℃-10 h处理后样品的耐腐蚀性能最好。其原因在于:经此处理后,基体αZr中固溶的Nb含量较低,βZr分解后获得了细小尺寸分布的βNb(含Fe)第二相粒子,后者对改善耐腐蚀性能尤为重要。但当合金中含有Cr时,因Cr和Fe首先与Zr形成Zr(FeCr)_2第二相,减少了βNb粒子中的Fe含量,而使耐腐蚀性能变坏。样品在最终560℃加热处理之前的冷轧变形可促进βZr分解时的形核,是获得细小尺寸βNb的必要措施。

     

    Abstract: The specimens of Zr-Sn-Nb alloy with two different composition were treated in different ways as 1 000 ℃-0. 5 h, 1 000℃-0. 5 h/560 ℃-10 h, 1 000 ℃-0. 5 h/C. R. (cold rolling)/560 ℃-10 h and 750 ℃-0. 5 h, 750 ℃-0. 5 h/560 ℃-10 h, 750℃-0. 5 h/ C. R. /560 ℃-10 h, respectively. Their microstructures were examined by transmission electron microscopy (TEM), and the corrosion resistance was investigated with autoclave tests in 0. 04 mol · L-1 LiOH aqueous solution at 350 ℃, 16. 8 MPa. It shows that the corrosion resistance of specimens treated by 750 ℃-0. 5 h/C. R. /560 ℃-10 h is the best among all specimens treated in different ways in present study. A lower niobium concentration in solid solution in αZr matrix and a uniform distribution of fine αNb (containing iron) particles are important factors for improving the corrosion resistance significantly, especially, the later one is more important. Chromium, if it is contained in the alloy, will go with iron to form Zr(FeCr)2 second phase particles at first, then the cor- rosion resistance decreases due to the depletion of iron in the βNb fine particles. The cold deformation before the final annealing at 560℃ plays an important role in obtaining fine βNb particles because which can promote the nucleation during the *Zr decomposition.

     

  • [1] Foster JP, Dougherty J, Burke MG, et al. Influence of Final Recrystallization Heat Treatment on Zircaloy-4 Strip Corrosion[J]. J Nucl Mater,1990, 173: 164~178.
    [2] Thorvaldsson T, Andersson T, Wilson A, et al.Correlation Between 400 ℃ Steam Corrosion Behavior, Heat Treatment, and Microstructure of Zircaloy-4 Tubing[A]. Zirconium in the Nuclear Industry: Eighth International Symposium,ASTM STP 1023 [C]. Philadelphia, PA: America Society for Testing and Materials, 1989. 128~1 40.
    [3] Zhou Bangxin, Zhao Wenjin, Miao Zhi, et al. The Effect of Heat Treatment on the Corrosion Behavior of Zircaloy-4: CNIC-01074, SINRE-0066 [R]. Beijing: China Nuclear Information Center,1 996.
    [4] Mardon JP, Garner G, Beslu P, et al. Update on the Development of Advanced Zirconium Alloys for PWR Fuel Rod Cladding[R] (Presented in ANS Fuel Performance Conference in Portland)Portland, USA: ANS, 1997.
    [5] Bark JH,Jeong YH, Kim IS. Effect of the Accumulated Annealing Parameter on the Corrosion Characteristics of a Zr-0. 5Nb-1. 0Sn-0. 5Fe0. 25Cr alloy [J]. J Nucl Mater, 2000, 280: 235~245.
    [6] Kim JM, Jeong YH, Jung YH. Correlation of Heat Treatment and Corrosion Behavior of Zr-Nb-Sn-Fe-Cu Alloys [J]. J Mater Prot Tech,2000, 104: 145~149.
    [7] 李 强,刘文庆,周邦新.变形及热处理对Zr-Sn-Nb合金中β-Zr分解的影响[J]. 稀有金属材料与工程,2002,31(5) :389~392.
    [8] Choo KN, Kang YH, Pyum SI, et al. Effect of Composition and Heat Treatment on the Microstructure and Corrosion Behavior of Zr-Nb Alloys [J]. J Nucl Mater, 1994, 209: 226~235.
    [9] Lin YP,Woo OT. Oxidation of β-Zr and Related Phases in Zr-Nb Alloy: An Electron Microscopy Investigation[J]. J Nucl Mater, 2000, 277: 11~27.
    [10] Pecheur D. Oxidation of β-Nb and Zr (Fe, V)_2 Precipitates in Oxide Films Formed on Advanced Zr-based Alloys[J]. J Nucl Mater,2000, 278: 195~201.
    [11] 周邦新.Zr-Sn-Nb系合金的显微组织研究[A]. ’96中国材料研讨会会议文集,生物及环境材料,Ⅲ-2[C]. 北京:化学工业出版社,1997. 187~191.
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出版历程
  • 收稿日期:  2003-01-21
  • 刊出日期:  2003-07-19

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