合金元素铌对新锆合金耐蚀性能的影响  

Effect of Nb on Corrosion Resistance of New Zirconium Alloys

作　　者：李中奎[1] 张建军[2] 刘建章[2] 周廉[2] 王文生[2] 周青山[2] 宋启忠[2] 

机构地区：[1]西安交通大学,陕西西安710049 [2]西北有色金属研究院,陕西西安710016

出　　处：《原子能科学技术》2005年第B07期10-13,共4页Atomic Energy Science and Technology

摘　　要：用SEM波谱分析手段,定性研究了合金元素铌在新锆合金中的存在方式。结果表明,添加的合金元素铌主要存在于LAVES相中,在αZr中的固溶度则小于100μg·g-1。由此可推断,铌和铁、铬共存时,优先形成沉淀相,造成它在αZr中固溶量的降低。结合2种新锆合金(低铌NZ2,高铌NZ8)板材在360℃含锂水中和400、500℃蒸汽中的堆外高压釜腐蚀性能方面的以往研究结果,对铌的作用进行了唯象的讨论,并指出,认知固溶于αZr中微量的铌和大量存在于LAVES相中的铌对腐蚀机理的影响是今后研究的重要课题。The existing form of niobium in zirconium-based alloy containing Fe, Sn, Cr alloying elements was researched qualitatively by means of SEM. The results show that most parts of niobium together with Fe, Cr forms in LAVES precipitate firstly, and the solubility of niobium in α-Zr is lower than 100 μg·g -1. Combining with the previous research of Nb on out-of-pile corrosion resistance, the relatively higher content of Nb is beneficial to improving the resistance in lithiated water, but harmful to the resistance in steam in autoclave test. It is suggested that the study on the influence of intermediate annealing on content of Nb both in α-Zr and in LAVES precipitate is very important to research the corrosion mechanism.

关 键 词：新锆合金 合金元素铌 耐蚀性能 沉淀相 

分 类 号：TG146.414[一般工业技术—材料科学与工程]