Sintering and Joining of Ni-Based Superalloys via FAST for Turbine Disc Applications
| Autor: | Derek S. King, Charis I. Lin, Anil K. Kulkarni, Sebastian J. Niuman, Namiko Yamamoto, Jogender Singh |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Metallurgy 0211 other engineering and technologies Metals and Alloys Sintering 02 engineering and technology Condensed Matter Physics Microstructure 01 natural sciences Superalloy Creep Mechanics of Materials 0103 physical sciences Friction welding Inconel Diffusion bonding 021102 mining & metallurgy Tensile testing |
| Zdroj: | Metallurgical and Materials Transactions A. 51:1353-1366 |
| ISSN: | 1543-1940 1073-5623 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink