Nb、Cu对新型高温锆合金α/β相变温度和腐蚀性能的影响  

Effect of Nb and Cu on α/β Phase Transition Temperature and Corrosion Behavior of New Type Zirconium Alloys

作　　者：罗伟[1] 王均[1,2] 熊计[1] 应诗浩[2] 杨晓雪[2] 张太平[1] 

机构地区：[1]四川大学制造科学与工程学院,成都610065 [2]中国核动力研究设计院反应堆燃料及材料重点实验室,成都610041

出　　处：《核动力工程》2012年第1期93-97,共5页Nuclear Power Engineering

基　　金：反应堆燃料及材料重点实验室项目(9140C7004040903);中国博士后科学基金(20090451426)

摘　　要：研究不同元素含量的Zr-Nb-Cu合金的显微组织和其在500℃、10.3 MPa过热蒸汽中的耐腐蚀性能,结果表明,在500℃、10.3 MPa过热蒸汽中,Zr-1.0Nb-0.05Cu合金的耐腐蚀性能最好,其耐腐蚀性能远远优于Zr-4和N18合金。在Zr-Nb-Cu合金中形成富含Nb、Fe、Cr的第二相粒子,这是影响锆合金耐腐蚀性能的一个原因。Zr-Nb-Cu合金在差热扫描量热仪分析的升温过程中,腐蚀产生的氢化物溶解,温度达到氢致α/β相变温度(约550℃)时开始β相变。添加Nb可以降低合金发生氢致β相变的温度,而增加Cu含量,可以降低合金腐蚀时的吸氢量,同时也使合金的耐腐蚀性能得到明显的提高。The microstructure and the performance of corrosion resistance of Zr-Nb-Cu alloys have been investigated in the superheated steam of 500℃/10.3MPa.The results showed that the alloy Zr-1.0Nb-0.05Cu possessed the best corrosion resistance,which was far superior to that of Zr-4 and N18.The second phase par-ticles which contain Nb,Fe and Cr formed in Zr-Nb-Cu alloys,which was a factor that affected the corrosion resistance of Zr alloys.During heating up of Zr-Nb-Cu alloys in the DSC experiment,the corrosion induced hydride dissolved and hydrogen solutionizing in the matrix.When the temperature reached to α/β phase tran-sition temperature（about 550℃）,β phase transformation occurred.The addition of Nb element can decrease the temperature of hydrogen-induced β phase transformation,and the increasing of Cu content can reduce the hydrogen absorbing amount,and improve the corrosion resistance of the alloy significantly.

关 键 词：Zr-Nb-Cu合金 抗腐蚀性能 DSC曲线 α/β相变温度 

分 类 号：TG146.414[一般工业技术—材料科学与工程]