| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Accelerated Discovery and Insertion of Next Generation Structural Materials
|
| Presentation Title |
CALPHAD-Enabled Prevention of Strain Age Cracking in Additively Manufactured, High-Temperature Co-Based 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 strong, oxidation resistant alloys at high temperatures, for its capacity to fabricate components with reduced material waste and optimized geometries. This high strength, in terms of creep resistance and uniaxial tensile strength, 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 superalloys, 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 some Ni-based alloy spaces using empirically generated welding diagrams but is not yet described in analogous Co-based or Ni/Co-based compositions. We will present a mechanistic, thermodynamics-based criterion for quench sensitivity which is more generally applicable to higher-Co composition spaces and demonstrate the efficacy of this criterion to a CALPHAD-assisted cobalt/nickel-based design. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Computational Materials Science & Engineering, Copper / Nickel / Cobalt |