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<p>Interlayer composition is an important variable in brazing that plays a vital role in the microstructural features and performance of brazed joints. The innovative approach of NIMONIC 105 superalloy brazing via interlayers with different compositions, namely BNi-2, BNi-10, and BCo-1, was experimentally investigated. Microstructural characterization revealed that segregation of Si element has occurred in the joint centerline of brazement made via BNi-2 as filler. Utilizing BCo-1 as a filler reduced the diffusion-affected zone (DAZ) thickness from 26 to 10&#xa0;µm. Additionally, W-rich Co-based filler metal produced a more homogenous interface region from a micro-hardness point of view by controlling the diffusion of melting point depressants. The ductility of the joint is primarily influenced by the extent of boride second-phase formation in the diffusion-affected zone (DAZ) and was ranked as BCo-1 &gt; BNi-10 &gt; BNi-2. From the high-temperature corrosion resistance point of view, the approach of adding Co and W to the filler consistently improved joint performance.</p>

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Microstructural Features and Joint Performance of NIMONIC 105 Superalloy Brazed Joints Created Via Different Interlayers

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • Sina Fadaei,
  • Mohammad Ammar Mofid,
  • Reza Barazandeh,
  • Hadi Nasiri Vatan

摘要

Interlayer composition is an important variable in brazing that plays a vital role in the microstructural features and performance of brazed joints. The innovative approach of NIMONIC 105 superalloy brazing via interlayers with different compositions, namely BNi-2, BNi-10, and BCo-1, was experimentally investigated. Microstructural characterization revealed that segregation of Si element has occurred in the joint centerline of brazement made via BNi-2 as filler. Utilizing BCo-1 as a filler reduced the diffusion-affected zone (DAZ) thickness from 26 to 10 µm. Additionally, W-rich Co-based filler metal produced a more homogenous interface region from a micro-hardness point of view by controlling the diffusion of melting point depressants. The ductility of the joint is primarily influenced by the extent of boride second-phase formation in the diffusion-affected zone (DAZ) and was ranked as BCo-1 > BNi-10 > BNi-2. From the high-temperature corrosion resistance point of view, the approach of adding Co and W to the filler consistently improved joint performance.