| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Accelerated Discovery and Insertion of Next Generation Structural Materials
|
| Presentation Title |
Prevention of Strain Age Cracking in Additively Manufactured, High-temperature Superalloys |
| Author(s) |
Krista Biggs, Florian Hengsbach, Gregory Olson |
| On-Site Speaker (Planned) |
Krista Biggs |
| Abstract Scope |
Additively manufacturing superalloys is an attractive option in aerospace applications which require alloys with high strength and oxidation resistance at high temperatures, for its capacity to fabricate such components with little material waste and optimized geometries. This high strength, in terms of creep resistance, uniaxial tension, and toughness, depends on high fractions of reinforcing precipitate phases, such as gamma prime, upon aging. However, large precipitate fractions pose a substantial tradeoff in the printability of traditional alloys, as the driving force for precipitation increases the system’s quench sensitivity during manufacturing, which results in strain age cracking and part failure. Currently, quench sensitivity is predicted within this alloy space using empirically generated welding diagrams. We will present a mechanistic, thermodynamics-based criterion for quench sensitivity and demonstrate the efficacy of this criterion (as well as relevant design rules and constraints) to a CALPHAD-assisted cobalt/nickel-based superalloy design. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Computational Materials Science & Engineering, Phase Transformations |