| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Impact of Post-processing on the Performances of Laser Additively Manufactured High-γ’ Ni Superalloys |
| Author(s) |
Ning Zhou, Austin D Dicus, Stephane A.J. Forsik, Tao Wang, Gian A Colombo, Mario E Epler |
| On-Site Speaker (Planned) |
Ning Zhou |
| Abstract Scope |
Laser additive manufacturing (AM) of high-γ’ volume fraction superalloys produces as-built microstructures consisting of dendritic grains and extremely fine γ’ precipitates. Hot isostatic pressing (HIP) and post-built heat treatments are critical steps to generate the microstructure necessary for good elevated temperature properties while mitigating the impact of residual stress and strain-age cracking associated with the precipitation of γ’. Thermodynamic modeling and multiple experimental heat treatments were performed on several experimental high-γ’ Ni superalloys to optimize the size and distribution of grain boundary carbides, control the grain size and obtain the desired γ’ morphology. The best mechanical properties were obtained after HIP and a subsolvus solution treatment without additional aging heat treatment and reached 1200 MPa ultimate tensile strength and 1120 MPa yield strength at 760°C. Extensive experimental characterization was performed to understand the relationship between processing, microstructure and mechanical properties to balance high-temperature strength and ductility. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Mechanical Properties |