Nb-1Zr与1Cr18Ni9电子束自钎焊形成的互扩散层的微观组织分析  

Microstructure of Interdiffused Layer Formed by Electron Beam Self-material Brazing of Nb-1Zr Alloy and 1Cr18Ni9 Stainless Steel

作　　者：马雁[1] 杨启法[1] 李鑫[1] 王振东[1] 郑剑平[1] 

机构地区：[1]中国原子能科学研究院反应堆工程研究设计所,北京102413

出　　处：《原子能科学技术》2004年第2期105-110,共6页Atomic Energy Science and Technology

摘　　要：利用扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)和电子衍射能谱仪 (EDS)分析了Nb 1Zr合金与 1Cr1 8Ni9不锈钢在电子束自钎焊过程中形成的互扩散层的微观组织形貌、析出相成分和结构。结果表明 :在电子束自钎焊过程中 ,两种合金的合金元素在界面处产生强烈的相互扩散 ,形成互扩散过渡层 ,互扩散以Nb向不锈钢一侧扩散为主 ;扩散层金相组织主要由基体组织和条状析出物组成 ,条状析出物呈全片层状结构。通过对析出相选区衍射花样 (SADP)分析 ,初步确定互扩散层的析出物为μ Fe(Ni) 7Nb6 和σ FeCr金属间化合物 ,而基体组织则为四方结构的α Fe(Ni,Cr,Nb ,C)相。The microstructure and the element profiles of the interdiffused layer formed by electron beam self-material brazing of Nb-1Zr alloy to 1Cr18Ni9 stainless steel was examined by SEM, TEM and EDS. It is found that constituent element interdiffusion is strongly occurred through interface between two materials and an interdiffused layer is formed during electron beam self-materials brazing. The transmission electron morphologies of interdiffused layer shows two sets of microstructures in it, one is a strip precipitated phase and the other is a matrix phase based on bulk material. Moreover, the strip precipitation is a full laminated strcture which contains two kinds of full laminated precipitated phases. From indexing of the SADP patterns of precipitated phases, it may conclude that the two full laminated precipitated phases are SADP patterns of precipitated phases, it may conclude that the two full laminated precipitated phases are μ-Fe(Ni) 7Nb 6 and σ-FeCr, respectively, the matrix phase is belong to α-Fe(Cr, Ni, Nb, C) phase.

关 键 词：1Cr18Ni9不锈钢 电子束自钎焊 互扩散层 微观组织 核工业 铌锆合金 

分 类 号：TL35[核科学技术—核技术及应用] TG457.11[金属学及工艺—焊接]