| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Towards Rapid Qualification
|
| Presentation Title |
Elevated Temperature Fatigue Mechanisms of the LPBF IN718 Alloy Densified by HIP with High CSL Density |
| Author(s) |
Marcus C. Lam, Carla Colon Cruz, Mariah Farmer, Alexis Loustaunau, Andrew Wessman, Sammy Tin |
| On-Site Speaker (Planned) |
Marcus C. Lam |
| Abstract Scope |
Additively manufactured IN718 superalloy by LPBF is gaining traction in high-temperature applications, yet comprehensive reports on its high-temperature fatigue mechanisms remain limited. This study investigates the fatigue performance of the LPBF IN718 processed through supersolvus treatments with HIP producing high CSL density. Tension-tension fatigue tests were conducted from RT to 750°C, with focus on 450C for extended high-temperature application. The analysis entails the initial microstructures before and after the tests, including the examinations of fractured fatigue zones from initiation, propagation, to fast fracture. High-resolution electron backscatter diffraction (EBSD) was utilized to analyze the grain structure and microstructural strain, especially immediately beneath the fracture surface, to understand crack initiation and propagation behaviors. The fatigue performances at different temperatures will also be compared and discussed. This research aims to enhance the understanding of fatigue mechanisms in additively manufactured IN718, offering valuable insights into the critical microstructural features required for robust fatigue performance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Mechanical Properties |