温度对纯铁中间层连接低活化钢扩散行为的影响  

Effect of Temperature on Diffusion Behavior of Reduced Activation Steel Joining with Pure Iron Interlayer

作　　者：陈永充 王均安[1] 何亚利 包喜荣 陈崇林 张朦 CHEN Yongchong;WANG Jun’an;HE Yali;BAO Xirong;CHEN Chonglin;ZHANG Meng(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444

出　　处：《上海金属》2022年第2期15-23,共9页Shanghai Metals

基　　金：国家重点基础研究发展计划(973计划)(2011CB610503)。

摘　　要：采用Gleeble-3500热模拟试验机,在950~1100℃进行了低活化钢加纯铁中间层的扩散连接,通过对连接界面附近显微组织、元素分布和显微硬度的分析和测试,研究了温度对连接界面元素扩散行为的影响。结果表明:经不同温度扩散连接后,接头的显微组织由母材的板条马氏体、连接界面处的Fe-Cr固溶体和中心层未发生扩散的纯铁3部分组成。连接界面处发生互扩散形成扩散层,扩散层的厚度随温度升高而增加;Cr元素在纯铁中间层的扩散符合菲克第二定律,扩散系数与温度的关系为D=1.43×10^(-7) exp(-210900/RT)。Diffusion bonding of reduced activation steel with pure iron interlayer was carried out by a Gleeble-3500 thermo-mechanical simulator at temperatures of 950 to 1100℃.Through the testing and analysis of microstructure,distribution of element and microhardness in the vicinity of joint interface,the influence of temperature on the diffusion behavior of bonded interface was studied.The results showed that the microstructure of the joint was composed of lath martensite of the base metal,ironchromium solid solution and pure iron without diffusion in the middle layer after diffusion bonding at different temperatures.The diffusion layer was formed by mutual diffusion at the bonded interface,and the thickness of the diffusion layer increased with the increase in temperature.The diffusion behavior of chromium in pure iron interlayer complied with the Fick’s second law and the dependence of the diffusion coefficient on temperature was expressed as D=1.43×10^(-7) exp(-210900/RT).

关 键 词：低活化钢 扩散连接 纯铁中间层 扩散行为 

分 类 号：TG457.11[金属学及工艺—焊接]