| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
|
| Presentation Title |
A-47: Liquation Cracking Study of Additively Manufactured Alloy 718 Using Thermal-mechanical Simulator |
| Author(s) |
Sangguk Jeong, Gangaraju Manogna Karthik, Soung Yeoul Ahn, Eun Seong Kim, Hyoung Seop Kim |
| On-Site Speaker (Planned) |
Sangguk Jeong |
| Abstract Scope |
Additively manufactured alloy 718 has a very unique microstructure, which is distinguishable from wrought and cast alloy. In addition, the hot isostatic press (HIP), which is excellent for reducing internal defects and improving material properties, affects the microstructure a lot. On the other hand, in alloy 718, liquation cracking can occur due to the Laves phase and carbide. In this study, the liquation cracking behavior of additively manufactured samples was compared under three different heat treatment conditions (① As-built, ② stress relieved, and ③ HIPed).
Using Gleeble 3500 thermal-mechanical simulator, NDT (nil ductility temperature) and DRT (ductility recovery temperature) were compared. Among the 3 conditions, HIP sample showed low DRT. In the HIPed sample, coarsening of grain size and Laves phase particle can be seen. It was confirmed that the decrease of the grain boundary length and the growth of the Nb-rich phase made the material susceptible to liquation cracking. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Characterization |