| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture IV: Toward Confident Use in Critical Applications
|
| Presentation Title |
Fatigue Behavior and Failure Mechanisms of Laser Beam Directed Energy Deposited Inconel 718 |
| Author(s) |
Rakish Shrestha, Alexander Johnson, Pooriya D. Nezhadfar, Nima Shamsaei |
| On-Site Speaker (Planned) |
Pooriya D. Nezhadfar |
| Abstract Scope |
Due to its superior mechanical properties at a wide range of temperatures, Inconel 718, a nickel based super alloy, is being extensively used in jet engines. However, due to its high hardness, Inconel parts are known for their poor machinability. With the opportunity to fabricate near net shaped parts via additive manufacturing, Inconel 718 has been given more prominence lately. In this study, cyclic deformation and fatigue behavior of Inconel 718 fabricated using laser beam directed energy deposition process at room and elevated temperatures are investigated. Fully-reversed, strain-controlled fatigue tests were conducted at ambient temperature and 650 °C under various strain amplitudes. The grain structure evolution due to cyclic deformation at elevated temperature is characterized using microscopy. Fractography analysis is employed to capture failure mechanisms and identify internal defects responsible for the crack initiation. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |