| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
|
| Presentation Title |
Additive Manufacturing of Co-Based Superalloys with High γ′ Volume Fraction via Direct Ink Writing |
| Author(s) |
Jian Liu, Wen Chen |
| On-Site Speaker (Planned) |
Jian Liu |
| Abstract Scope |
Additive manufacturing of superalloys enables innovative designs combined with excellent mechanical properties. The challenge for the fusion-based additive manufacturing of high-γʹ superalloys is their high susceptibility to cracking. Here, we utilized direct ink writing (DIW) to fabricate a defect-free high-γʹ Co-based superalloy. During DIW, the inks containing metal powders and polymer binders were extruded from a nozzle and subsequently sintered to near-full density, followed by ageing. The sintered Co-based superalloy exhibits homogeneous microstructure of equiaxed grains with MC carbides uniformly distributed in the FCC matrix, which lead to the ultimate tensile stress in excess of 1.2 GPa and tensile ductility greater than 18% at room temperature. The outstanding combination of strength and ductility originates from high-volume fraction coherent γ′ nanoprecipitates and deformation-induced stacking faults. Consequently, due to the intrinsic isothermal nature of DIW, it possesses the ability to process a wide range of high-γʹ superalloys with high-temperature applications. |
| Proceedings Inclusion? |
Planned: |