| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
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Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work: The Rustum Roy Symposium
|
| Presentation Title |
Solid State Joining of Dissimilar Single Crystal Ni-based Superalloys Using Field Assisted Sintering Technology (FAST) |
| Author(s) |
Charis Iann Lin, Jogender Singh, Matthew C Hogan, Namiko Yamamoto |
| On-Site Speaker (Planned) |
Charis Iann Lin |
| Abstract Scope |
This work demonstrates that two single crystal Ni-superalloys (PWA 1429 and PWA 1480) can be joined in the solid state using FAST without a heat affected zone or localized melting. Microstructural inspection revealed a void-free interface without a sharp interface line, but with some changes in precipitation morphology at the interface due to the chemical composition gradient. Preliminary room temperature tensile testing indicated bonding strengths comparable to that of the parent materials, though fracture occurred at the material interface. Our results show the potential of high-density electric current assisted diffusion bonding for high-strength joining of single crystal Ni-superalloys. FAST opens the door for gas turbine blade repair, including single crystal Ni-superalloys, and eliminates many of the shortcomings of current joining technologies associated with melting processes at the interface, grain recrystallization, and precipitation of carbides and Laves phases, which decrease the alloying elements available for precipitation strengthening. |