退火温度对Zr-0.85Sn-0.16Nb-0.38Fe-0.18Cr合金耐腐蚀性能的影响  

Effect of Annealing Temperatures on Corrosion Resistance of a Zr-0.85Sn-0.16Nb-0.38Fe-0.18Cr Alloy

作　　者：姚美意[1] 张伟鹏[1] 周军[2] 周邦新[1] 李强[1] 

机构地区：[1]上海大学材料研究所,上海200072 [2]西北有色金属研究院,西安710016

出　　处：《核动力工程》2012年第6期88-92,共5页Nuclear Power Engineering

基　　金：国家自然科学基金项目(50971084;51171102)

摘　　要：为了研究退火温度对Zr-0.85Sn-0.16Nb-0.38Fe-0.18Cr合金耐腐蚀性能的影响,在740-820℃温度范围内改变冷轧前后的退火温度制备样品,通过静态高压釜腐蚀实验研究样品在360℃/18.6 MPa去离子水、400℃/10.3 MPa过热蒸汽和500℃/10.3 MPa过热蒸汽中的腐蚀行为;用透射电镜(TEM)和能谱仪(EDS)研究合金的显微组织,包括第二相的尺寸、成分与种类。研究结果表明,这种锆合金中的第二相为含少量Nb的密排六方结构的Zr(Fe,Cr,Nb)2,提高退火温度使第二相尺寸增大,第二相中的Nb含量降低;在740-800℃温度范围内改变退火温度,样品在上述中性水质中的耐腐蚀性能与常规工艺处理的相当,且都优于Zr-4合金,表明该合金的耐腐蚀性能对退火温度并不敏感。To investigate the effect of annealing temperatures on the corrosion resistance of a Zr-0.85Sn-0.16Nb-0.38Fe-0.18Cr alloy, different annealing temperatures （740-820℃） before and after the final cold rolling were employed to prepare the specimens for corrosion tests. The specimens were corroded in deionized water at 360℃/18.6 MPa, in super heated steam at 400℃/10.3 MPa and at 500℃/10.3 MPa, respectively by autoclave test. The microstructure including the size and composition of second phase particles （SPPs） was examined by TEM and EDS. Results show that the SPPs in the Zr-0.85Sn-0.16Nb-0.38Fe-0.18Cr alloy are Zr（Fe,Cr, Nb）2 with a hcp structure; With the increasing of annealing temperatures, the size of the SPPs increases and the Nb content in the SPPs decreases; Under the three test conditions, the specimens annealed at different temperatures between 740℃ and 800℃ are all with corrosion resistance behavior as good as the specimen prepared by conventional procedures, and their corrosion resistance is superior to Zircaloy-4. This indicates that the corrosion resistance of this alloy is insensitive to the annealing temperatures.

关 键 词：锆合金 耐腐蚀性能 退火温度 显微组织 

分 类 号：TL341[核科学技术—核技术及应用]