About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Materials in Energy Environments
|
| Presentation Title |
F-11: Stress Relief Heat Treatment and Residual Stress Characterization for Additively Manufactured High γ’ Ni-base GammaPrint™-1100 Superalloy |
| Author(s) |
Ning Zhou, Gian Colombo, Stephane Forsik, Austin Dicus, Tao Wang, Theresa Novak, Mario Epler, Michael Kirka, Patxi Fernandez-Zelaia, Christopher Ledford, Daniel Ryan |
| On-Site Speaker (Planned) |
Ning Zhou |
| Abstract Scope |
Residual stress in as-printed AM parts is caused by extreme cooling rates and large thermal gradients. In complex designs, this process-induced residual stress is also accentuated by the presence of internal features and stress concentrators. Because of the fast cooling, γ’-forming elements are still in solution in the as-printed state and γ’ starts to precipitate during the post-processing heat treatment, adding misfit stress to the residual stress and potentially leading to cracking during manufacture. A multi-step stress relief heat treatment was designed to trigger recovery and recrystallization as γ’ starts to precipitate which allows the matrix to relax and prevents strain-age cracking. This heat treatment was validated on cracking susceptibility artifacts manufactured with GammaPrint™-1100, a novel high γ’ Ni base superalloy for energy/aerospace application. X-ray diffraction and electron backscatter diffraction were used to characterize the residual strain evolution during the cycle leading to recovery and relaxation of the residual stress. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, |