Zr-0.8Sn-1Nb-0.3Fe锆合金显微组织与耐腐蚀性能关系（英文）  

Correlation Between Microstructure and Corrosion Behavior of Zr-0.8Sn-1Nb-0.3Fe Alloy

作　　者：杨忠波[1] 程竹青[1] 邱军[1] 张海[1] 赵文金[1] Yang Zhongbo, Cheng Zhuqing, Qiu Jun, Zhang Hai, Zhao Wenjin(Reactor Fuel and Material Key Laboratory, Nuclear Power Institute of China, Chengdu 610213, Chin)

机构地区：[1]中国核动力研究设计院反应堆燃料及材料重点实验室,四川成都610213

出　　处：《稀有金属材料与工程》2018年第3期794-798,共5页Rare Metal Materials and Engineering

摘　　要：采用不同的热处理工艺制备出Zr-0.8Sn-1Nb-0.3Fe合金板材试样,用OM、TEM分析了试样的显微组织,用静态高压釜进行了360℃/18.6 MPa/0.01 mol/L LiOH水溶液和400 ℃/10.3 MPa蒸气腐蚀试验。结果表明,随着热轧温度从600 ℃增加至700 ℃时,第二相分布均匀性逐渐变差,第二相主要为C14型HCP-Zr(Nb, Fe)_2;热轧前时效改善第二相分布均匀性的同时,促进Nb的扩散,相应增加了βNb的数量,延长最终退火时间对第二相分布影响不大,但增加了第二相中的Nb/Fe比;合金在2种水化学介质中的耐腐蚀性能随热轧温度升高而降低,热轧前时效能改善合金的耐腐蚀性能,延长最终退火时间提高了合金在LiOH溶液中的耐腐蚀性能,但对合金在过热蒸气中腐蚀不利;分析了显微组织与耐腐蚀性能的关系,认为第二相尺寸分布、Nb含量是引起Zr-Sn-Nb-Fe锆合金耐腐蚀性能差别的主要原因。Zr-0.8Sn-1Nb-0.3Fe zirconium alloy sheets were prepared by different heat treatment processes. Then OM and TEM were used to analyze the microstructure of the samples, and static autoclave tests were carried out in 360 ℃/18.6 MPa/0.01 mol/L LiOH solution and 400 ℃/10.3 MPa superheated steam to investigate the corrosion behavior. The results show that the second phase particles （SPPs） are mainly C14 type Zr（Nb,Fe）2 with a HCP structure, and the uniformity of SPPs distribution gradually becomes worse when the hot-rolling temperature increases from 600 to 700 ℃. Aging treatment before hot-rolling not only improves the uniformity of SPPs distribution, but also promotes the diffusion of Nb, which increases the amount of βNb SPPs. Extension of final annealing time has little influence on size and distribution of the SPPs, but increases the Nb/Fe ratio in the SPPs. After long time corrosion tests, the corrosion resistance becomes worse when the hot-rolling temperature increases in both corrosion conditions. Aging treatment before hot-rolling can increase the corrosion resistance. Extension of final annealing time can also increase the corrosion resistance in LiO H solution, but decrease the corrosion resistance in superheated steam. The relationship between microstructure and corrosion resistance was discussed, and the size, distribution and the Nb content of SPPs are considered to be the main reason for the difference of the corrosion resistance of Zr-Sn-Nb-Fe zirconium alloys.

关 键 词：Zr-0.8Sn-1Nb-0.3Fe锆合金 热处理 显微组织 腐蚀 

分 类 号：TG146.414[一般工业技术—材料科学与工程]