| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Materials in Energy Environments II
|
| Presentation Title |
An Additively Manufactured IN718 Strengthened by CSL Boundaries with High-Temperature Tensile and Short-Term Creep Resistance up to 800°C |
| Author(s) |
Marcus C. Lam, Anthony Koumpias, Amberlee S. Haselhuhn , Andrew Wessman, Sammy Tin |
| On-Site Speaker (Planned) |
Marcus C. Lam |
| Abstract Scope |
Emerging aerospace applications such as reusable rockets, ramjets, and next-generation turbine engines require non-cracking, cost-effective AM alloys with short-term creep resistance beyond the usual 650°C service temperature of IN718. This study explores the tensile and short-term creep resistance of IN718 produced by laser beam powder bed fusion (PBF-LB) and treated with a multi-step process (RHSA) incorporating hot isostatic pressing (HIP). The resulting microstructure, with over 60% coincident site lattice (CSL) boundaries, was tested up to 800°C. The high fraction of CSL boundaries significantly limited grain boundary (GB) cracking. EBSD measurements and a creep stress exponent of 10.9 indicated power law creep at 700°C and increased grain boundary sliding (GBS) at 800°C. Stress-assisted coarsening of γ'' and δ precipitations was observed at 800°C. The creep resistance of RHSA-treated IN718 is comparable to hot-rolled IN718 and superior to most cold-rolled or AM IN718, making it suitable for short-term, high-temperature applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Mechanical Properties |