| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in the State-of-the-Art of High Temperature Alloys
|
| Presentation Title |
Comparison of the Dwell Fatigue Crack Growth Behavior of Additively and Conventionally Manufactured Inconel 718 |
| Author(s) |
Zachary D. Harris, Isabelle Heintz, Santosh Narasimhachary, Robert Stephens, Cody Gibson, Ramesh Subramanian |
| On-Site Speaker (Planned) |
Zachary D. Harris |
| Abstract Scope |
The objective of this study is to assess the high temperature dwell fatigue performance of additively manufactured (AM) Inconel 718 relative to incumbent, conventionally manufactured (CM) Inconel 718. Experiments conducted at 600°C with a dwell period of 600 seconds reveal key differences in the crack growth rate (da/dN) versus stress intensity factor range (ΔK) relationships across the tested materials. In particular, results demonstrate that the AM materials can exhibit more severe dwell fatigue susceptibility relative to CM Inconel 718, but the extent depends on how the crack growth direction is oriented relative to the build direction. In particular, the AM Inconel 718 specimens oriented to crack perpendicular to the build direction exhibited a 20-fold decrease in measured da/dN as a function of ΔK relative to the other evaluated conditions, including the CM alloy. The microstructural factors that could be responsible for this behavior are then discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Environmental Effects, High-Temperature Materials |