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<p>Single lap braze joints were prepared from plates of IN625 superalloy. The commercially available boron-containing BNi-2 alloy was used in the overlap region of the braze joint, while the boron-free, filler metal 30 wt pct Ni-42.2 wt pct Cu-27.6 wt pct Mn (<i>i.e.</i> Ni30) was used in the formation of the fillets, creating a hybrid joint structure. Fracture initiated in the fillets of all hybrid joints. Infiltration of Ni30 into the overlap region was observed in some joints, which resulted in multiple modes of failure being observed. Where there was no Ni30 infiltration, the fracture propagated through the boron-based diffusionally affected zone (DAZ) adjacent to the IN625/BNi-2 braze interface. This fracture pattern and the resulting mechanical properties of these hybrid joints were comparable to a monolithic BNi-2/IN625 braze joint. Alternatively, where Ni30 infiltration was present, the fracture continued to shear through the brazed overlap region so long as the Ni30 was present in the gap. Upon reaching the boron-based BNi-2 DAZ, the fracture began to travel through the base metal. Hybrid joints where Ni30 infiltrated the gap achieved greater strengths and strains to failure compared to monolithic joints.</p>

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Development and Characterization of Boron-Containing/Boron-Free Hybrid Brazed Joints for TLP Bonding of Ni-Based Superalloys

  • 期刊论文

  • 发表日期：

    2025年7月27日

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  • Shannon Clemens,
  • Stephen F. Corbin,
  • Clare MacIsaac

摘要

Single lap braze joints were prepared from plates of IN625 superalloy. The commercially available boron-containing BNi-2 alloy was used in the overlap region of the braze joint, while the boron-free, filler metal 30 wt pct Ni-42.2 wt pct Cu-27.6 wt pct Mn (i.e. Ni30) was used in the formation of the fillets, creating a hybrid joint structure. Fracture initiated in the fillets of all hybrid joints. Infiltration of Ni30 into the overlap region was observed in some joints, which resulted in multiple modes of failure being observed. Where there was no Ni30 infiltration, the fracture propagated through the boron-based diffusionally affected zone (DAZ) adjacent to the IN625/BNi-2 braze interface. This fracture pattern and the resulting mechanical properties of these hybrid joints were comparable to a monolithic BNi-2/IN625 braze joint. Alternatively, where Ni30 infiltration was present, the fracture continued to shear through the brazed overlap region so long as the Ni30 was present in the gap. Upon reaching the boron-based BNi-2 DAZ, the fracture began to travel through the base metal. Hybrid joints where Ni30 infiltrated the gap achieved greater strengths and strains to failure compared to monolithic joints.