| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing:
Incorporating Breakthrough Functionalities for Building Large Scale Components
|
| Presentation Title |
Thermomechanical Processing of Additive Manufactured Nickel Superalloys for Cracking Prevention and Improved Performance. |
| Author(s) |
James E. German, William Sean James, Supriyo Ganguly, Goncalo Rodrigues Pardal |
| On-Site Speaker (Planned) |
James E. German |
| Abstract Scope |
In prior studies, nickel-based superalloys deposited via Wire-Arc Additive Manufacturing (WAAM) failed to match the strength of fully heat-treated wrought alloys. Highly alloyed materials like Rene 41 and Inconel 718 were also shown to be susceptible to hot-cracking. By incorporating inter-layer machine hammer peening (MHP) into the WAAM process, residual stress from deposition is relieved and dendritic grain growth is disrupted to eliminate hot-cracking and promote recrystallization. MHP is a flexible alternative to rolling, applying compressive stresses with a small tooltip impacting the material surface. This process can be applied easily to complex geometries.
As part of this study, several nickel superalloys (including IN718, H233, H282, H188) were built with PTA welding and MHP. The material showed improved mechanical properties and significant microstructural improvement when combined with heat treatment. MHP notably eliminated material cracking during deposition, promoted static recrystallization, and increased material strength. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Mechanical Properties |