About this Abstract |
| Meeting |
2025 AWS Professional Program
|
| Symposium
|
2025 AWS Professional Program
|
| Presentation Title |
Dissimilar Brazing of Ti-6Al-4V to Stainless Steel Using Ag-Based Braze Alloys |
| Author(s) |
Donald F. Susan, Ed Arata, David Kemmenoe, Mark Reece, Jonah Duch, Erin Barrick, Alex Hickman, Vida Perez, Austin Olivier |
| On-Site Speaker (Planned) |
Donald F. Susan |
| Abstract Scope |
Dissimilar alloy brazing between 304L stainless steel and Ti-6Al-4V was performed using the following filler metals: pure Ag, Ag-1Cu-2Zr active braze, Ag-9Ga-9Pd (Gapasil-9), and higher-temperature Gapasil-like alloys with increased Pd content. The goals of the project were to characterize the microstructure and properties of braze joints produced near 900°C as well as higher temperature regimes close to 1000°C for compatibility with a glass sealing operation. The higher-temperature AgGaPd alloys were developed using ThermoCalc thermodynamic modeling to target liquidus temperatures near 975°C. The microstructures of the braze joints were characterized by optical microscopy, SEM/EDS, and EBSD methods. Microhardness traces were performed though the joints and lap joint (AWS C3.2) mechanical testing was conducted. The strength of the braze joints is linked directly to the amount of intermetallic compound (IMC) formed in the joints. Multiple IMC’s were observed including phases based on TiFe2, TiFe, and the non-equilibrium phase Ti2Fe. Nickel-plating of the stainless steel and the use of Gapasil alloys can suppress IMC formation leading to higher braze strength.
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| Proceedings Inclusion? |
Undecided |