| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Microstructural and Mechanical Long-term Stability of AM Materials
|
| Presentation Title |
Location-Specific Microstructures and Properties of Haynes 282 Alloy With Laser-Wire Direct Energy Deposition Processing |
| Author(s) |
Rui Feng, Kristin Tippey, Jonathan Poplawsky, Dunji Yu, Ke An, Chantal Sudbrack |
| On-Site Speaker (Planned) |
Rui Feng |
| Abstract Scope |
Location-specific microstructures and properties are inevitably introduced during the laser-wire direct energy deposition (LW-DED), due to its complex thermal history. The location-dependent grain morphology, texture, precipitates, and dislocation density of LW-DED Haynes 282, a highly-fabricable Ni-based superalloy, are examined with SEM-EBSD-EDS, APT, TEM, and neutron diffraction. Bimodal grain distributions are observed with the fraction of fine-grain colonies decreasing as heat input increases. Mo-rich M6C and Ti-rich MC carbides prefer the interlayer regions. The location-dependent γ′-precipitates resulting from the layer-dependent cooling rates are found in the as-built condition, tripling in size with increased heat input at a middle layer, which contributes predominantly to the gradient hardness distribution. After commercial heat treatment, LW-DED 282 exhibits yield strengths comparable to conventionally-processed counterparts, with small deviations due to differences in bimodal grain distributions. The correlation between the LW-DED processing history and the location-specific microstructures established can guide process parameter selection and heat-treatment optimization. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, High-Temperature Materials |