Wide-gap transient liquid phase bonding of single crystal to polycrystalline nickel-base superalloys: Microstructural development and mechanical properties

R. Aluru, Nofrijon Bin Imam Sofyan, Jeffrey W. Fergus, W. F. Gale

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

The relationship between the microstructure and mechanical properties of transient liquid phase (TLP) bonds between single crystal CMSX-4 and polycrystalline IN939 and IN738, using wide-gap composite interlayers of Niflex-110 and Niflex-115, is investigated in this paper. A series of interrupted bonding tests were performed to study the bond microstructural development and are correlated with room-temperature mechanical properties. Post-bond microstructural investigations using scanning electron microscopy and energy dispersive x-ray spectroscopy (SEM/EDS), showed the preferential flow of eutectic along the grain boundaries of the Niflex core, rather than the wetting of the faying surfaces, leaving non-bonded regions at the latter. This problem was overcome by increasing the boron content of the Niflex foils, to form additional liquid. Suppression of bondline boride formation was achieved with the wide-gap composite interlayers. The extent of gamma-prime (γ') formation was found to have a greater influence on bond mechanical properties than the formation of second phases in the diffusion zone of the polycrystalline superalloy substrates.

Original languageEnglish
Title of host publicationTrends in Welding Research - Proceedings of the 7th International Conference
Pages879-883
Number of pages5
Publication statusPublished - 1 Dec 2005
Event7th International Conference on Trends in Welding Research - Pine Mountain, GA, United States
Duration: 16 May 200520 May 2005

Publication series

NameASM Proceedings of the International Conference: Trends in Welding Research
Volume2005

Conference

Conference7th International Conference on Trends in Welding Research
CountryUnited States
CityPine Mountain, GA
Period16/05/0520/05/05

Keywords

  • Mechanical properties
  • Microstructure
  • Nickel based superalloys
  • Transient liquid phase (TLP) joining
  • Wide-gap

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