【摘要】 为研究Fe元素对不锈钢钎焊接头及镍基钎料钎焊接头组织的影响,采用BNi-2+40%(质量分数)BNi-5混合钎料对纯Fe进行真空钎焊,运用金相分析、扫描电子显微镜(SEM)分析、能谱仪(EDS)分析,结合Thermo-Calc及Dictra软件,研究纯Fe钎焊接头显微组织、钎缝成分分布、相组成和元素扩散情况.结果表明,纯Fe钎缝主要由γ-Ni固溶体和Cr-B金属间化合物组成;通过Thermo-Calc和Dictra软件计算,温度冷却至1 173K时钎料仍未凝固结束,凝固过程中发生了共晶反应,此时相组成及元素扩散行为的计算结果与试验结果基本吻合,可在一定程度上指导钎焊新工艺的制定.更多还原

【Abstract】 In order to study the influence of Fe element on microstructures of brazing joint of stainless steel and nickel-based filler metal,vacuum brazing for pure Fe with BNi-2+40%BNi-5 composite filler was performed,the microstructure,element composition distribution,phase composition and element diffusion of the brazed joint were investigated by metallographic analysis,scanning electron microscopy(SEM),energy dispersive spectrometry(EDS) and Thermo-Calc and Dictra softwares.The result indicates that the brazed seam of pure Fe are composed of γ-Ni solid solution and Cr-B intermetallic compound.According to the calculations of Thermo-Calc and Dictra softwares,the solder solidification will not end when cooling down the temperture to 1 173 K,during which eutectic reaction has happened.The calculations of phase composition and element diffusion behaviors coincide with the experimental results,which can provide a guidance for new brazing technologies in a certain degree.更多还原