About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in the State-of-the-Art of High Temperature Alloys
|
| Presentation Title |
Effect of Precipitate Types and Distribution on Grain Refinement During Hot Deformation of Inconel |
| Author(s) |
Ji Seob An, Seung-Hyun Yeo, Su-Pin Heo, Jong-Sik Kim, Hyuk-Joon Kwon, Sun-Kwang Hwang |
| On-Site Speaker (Planned) |
Seung-Hyun Yeo |
| Abstract Scope |
Inconel 718 is a nickel-based superalloy widely used in aerospace turbine disks and high-temperature forging components due to its excellent high-temperature strength and creep resistance attributed to γ″(Ni₃Nb) and δ(Ni₃Nb) precipitates. This study aims to enhance the hot workability and grain refinement of Inconel 718 by optimizing microstructural stability through customized heat treatment and thermomechanical processing. Three heat treatment conditions were applied to control the precipitation behavior of γ″ and δ phases: delta process (DP), pre-aging treatment (PAT), and their combination (PAT-DP). The effects of each condition on high-temperature deformation behavior were evaluated through hot compression tests, microstructural analysis, and processing map analysis based on dynamic materials model (DMM). The PAT-DP condition formed a dual-phase structure with both γ″ and δ phases intragranular, providing optimal balance between enhanced workability and low instability while promoting grain refinement, effectively suppressing flow localization and crack initiation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Copper / Nickel / Cobalt, High-Temperature Materials, Sustainability |