【摘要】 借助扫描电子显微分析(SEM)、电子探针 X 射线显微分析(EPMA)等手段,观察分析了三层卷焊钢管钎焊接头的化学成分和微观组织。结果表明:①钎焊接头由上、下扩散区和中界区组成;②在扩散区的铁素体晶间,铜重量浓度可达10%左右,在中界区铁重量浓度约为6%;③在扩散区和中界区中均形成α和ε固溶体混合物;④钎焊接头性能优良。更多还原

【Abstract】 With the help of scanning electron microscope(SEM)and electron probe (EPMA),the chemical composition and microstructure of brazing joint of triple wall brazed tube have been investigated and analyzed.It is shown that ①the brazing joint consists of upper and lower diffusion area as well as the interracial area;②in the ferrite grain boundaries in diffusion area,Cu concentration in weight can be up to 10%,while Fe concentration in weight in the interracial area is about 6 %;③α and ε solid solution are formed in the diffusion and interracial area;④the brazing joint is of good properties.更多还原