Sintering and Joining of Ni-Based Superalloys via FAST for Turbine Disc Applications

Charis I. Lin, Sebastian J. Niuman, Anil K. Kulkarni, Derek S. King, Jogender Singh, Namiko Yamamoto

Research output: Contribution to journalArticle

Abstract

Turbine discs are currently made of nickel-based superalloys, known for their high strength and creep resistance at high temperatures. Turbine discs of dual microstructure, each tailored for different functions, allow for performance improvement and weight savings, but current methods of joining dissimilar nickel-based superalloys, such as friction welding, exhibit a heat-affected zone (HAZ) and localized melting at the interface, leading to weak bonding. Here, we demonstrate that field-assisted sintering technology (FAST) can be effective in sintering CM247LC powder to high relative density and in joining two dissimilar superalloys, CM247LC and Inconel 718 (IN718), by diffusion bonding without forming a heat-affected zone. The subscale tensile testing of this FAST-joined specimen resulted in failure through both the bonding zone and IN718; the yield strength (~ 348 MPa) is slighter higher than that of FAST-processed IN718, confirming successful joining by FAST.

Original languageEnglish (US)
Pages (from-to)1353-1366
Number of pages14
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume51
Issue number3
DOIs
Publication statusPublished - Mar 1 2020

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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