| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Investigating appropriate heat treatments for laser powder bed fusion nickel alloy 718 |
| Author(s) |
James Zuback, Andrew Iams, Saadi Habib, Mark Stoudt |
| On-Site Speaker (Planned) |
James Zuback |
| Abstract Scope |
Additively manufactured nickel superalloys often retain some solidification artifacts when as-printed material is subjected to standard post-process heat treatments. Appropriate solutionization or homogenization heat treatments should eliminate elemental segregation and dissolve unwanted solidification products, while avoiding extensive grain growth and incipient melting. In this work, the heat treatment of alloy 718 is investigated for the γ”-strengthened condition with an emphasis on the homogenization step prior to aging. Although current heat treatment protocols yield measured tensile properties within specifications, networks of unwanted delta phase form around remnant solidification structures that may degrade resistance to environmentally-assisted cracking. Increasing the solutionization temperature removes solidification artifacts, recrystallizes grains, and leads to acceptable aged microstructures and tensile properties. However, incipient melting and the formation of eutectic Laves phase occur as temperatures approach 1200 °C. The data and conclusions of this work highlight the need for standardization efforts specifically tailored for additively manufactured materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Copper / Nickel / Cobalt, High-Temperature Materials |