Since the emergence of the first Ni-based filler metals in the end of the 1940s, the formation of brittle phases due to the metalloids Si, B, and P has been a major challenge. A new approach to selectively manipulate the microstructure of brazing joints with Ni-based brazing alloys is to inoculate the brazing alloy with Ti. The aim of this study is to characterize the influence of Ti on the melting behavior and brazeability in brazed joints consisting of hot-work tool steel X38CrMoV5-1 and inoculated Ni-base brazing alloy Ni 620. For this purpose, the melting behavior of the brazing alloy in the inoculated and noninoculated state is investigated by means of combined differential scanning calorimetry (DSC)/thermogravimetric (TG) analysis. In addition, the flow behavior of the filler metal as well as the resulting microstructure are evaluated by means of acoustic microscopy and scanning electron microscopy on the basis of a special specimen shape. The results show that Ti inoculation has a significant influence on the melting behavior as well as on the flow behavior and the microstructure in this brazing joint.

中文翻译：

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钛孕育对Ni 620/X38CrMoV5-1钎焊接头熔化行为和显微组织的影响

自 1940 年代末第一种镍基填充金属出现以来，由于非金属 Si、B 和 P 导致脆性相的形成一直是一项重大挑战。一种用 Ni 基钎焊合金选择性控制钎焊接头微观结构的新方法是在钎焊合金中接种 Ti。本研究的目的是表征 Ti 对由热作工具钢 X38CrMoV5-1 和孕育镍基钎焊合金 Ni 620 组成的钎焊接头的熔化行为和钎焊性的影响。通过差示扫描量热法 (DSC)/热重 (TG) 组合分析，研究了孕育和非孕育状态下的钎焊合金。此外，填充金属的流动行为以及由此产生的微观结构通过声学显微镜和扫描电子显微镜在特殊样品形状的基础上进行评估。结果表明，Ti 孕育对该钎焊接头的熔化行为以及流动行为和微观结构有显着影响。