Microstructure and properties of liquid phase diffusion welded joint of GH4413 nickel-based high temperature alloy
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摘要: 以BNi-2作为填充合金材料使用液相扩散焊对CH4413合金进行了连接,研究了在焊接温度为1 030℃和1080℃,保温时间分别为30 min和60 min等不同焊接参数下CH4413镍基高温合金的接头微观组织、成分分布和显微硬度。扫描电镜(SEM)以及能谱分析结果表明,当焊接温度为1080℃,保温时间为60 min时,钎缝组织中形成了性能良好的固溶体,并且随着焊接温度的升高和保温时间的增加,钎缝的宽度增加,钎料元素向母材中的扩散深度逐渐增加,在母材近缝区形成了金属间化合物。Abstract: Liquid phase diffusion welding of GH4413 alloy was carried out and BNi-2 was used as filler material. The microstructure, composition distribution and microhardness of the welded joint were researched under different welding parameters. Welding temperature was respectively $1030{ }^{\circ} \mathrm{C}$ and $1080^{\circ} \mathrm{C}$, and heat preservation time was respectively 30 min and 60 min . The results of scanning electron microscopy (SEM) and energy spectrum analysis show that, when welding temperature was $1080{ }^{\circ} \mathrm{C}$, and heat preservation time was 60 min, the solid solution with good performance formed in brazing seam. In addition, the width of brazing seam increased, the diffusion depth of brazing filler metal's elements to base metal increased gradually and intermetallic compounds formed near seam section of base metal with the increase of welding temperature and heat preservation time.
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