摘要
采用扫描电镜和透射电镜分析比较了相同工艺条件下获得的Fe3Al/Q235及Fe3Al/Cr18-Ni8扩散焊界面的组织结构,研究了Cr、Ni元素对Fe3Al/钢扩散焊界面组织结构的影响.研究表明:Cr、Ni的扩散有利于促进Fe3Al与钢中Fe、Al元素的扩散结合,使Fe3Al/Cr18-Ni8扩散焊界面过渡区的宽度较Fe3Al/Q235界面过渡区大;并且Fe3Al/Cr18-Ni8扩散焊界面过渡区新形成的Fe3Al上弥散分布有含Cr、Ni的第二相,使FeAl出现了具有不同间距的位错对,甚至位错缠结现象,有利于提高FeAl/钢扩散焊界面的结合强度.
Microstructure in Fe3Al/Q235 and Fe3Al/Crl8 -Ni8 interfaces, which were obtained during diffusion welding with the same technological parameters, was analyzed and compared by means of scanning electron microscope （SEM） and transmission electron microscope （TEM）. The effect of Cr and Ni on microstructure in Fe3Al/steel diffusion-welded interface was discussed. The results indicate that it is favorable for the diffusion of Cr and Ni to accelerate diffusion and combination between Fe3Al and steel. Therefore, the width of Fe3Al/Crl8- Ni8 diffusion-welded interface is larger than that of Fe3Al/Q235 interface. Fe3Al dislocation pairs with different distance even entwisting dislocation occur in the Fe3Al/Crl8 -Ni8 diffusion-welded interface because of the dispersive distribution of Cr and Ni. This is favorable to improve combination strength in diffusion-welded interface between Fe3Al and steel.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2007年第4期469-472,476,共5页
Materials Science and Technology
基金
国家自然科学基金资助项目(50375088)
山东省中青年优秀科学家奖励基金资助项目(2006BS04004)
