| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Towards Rapid Qualification
|
| Presentation Title |
Fatigue Life Depends on Layer Height When Multiple Lasers are Used: A Study on L-PBF IN718 with As-Built Surfaces |
| Author(s) |
Orion L. Kafka, Jake Benzing, Nikolas Hrabe, Lucas Koepke, Philipp Schumacher, Donald Godfrey, Chad Beamer |
| On-Site Speaker (Planned) |
Orion L. Kafka |
| Abstract Scope |
Specimens built with Laser Powder Bed Fusion containing as-produced surface finish exhibit reduced high-cycle fatigue life compared to polished specimens, given the same heat treatment. Changes to build parameters can alter the surface condition, and thus may change the fatigue life. Furthermore, multiple lasers may be used to create one part. We found that there is no significant difference in fatigue life between single-laser parts built with 30 micrometer or 60 micrometer build layer height when tested with rotating beam fatigue. However, when multiple lasers were used, a trend in fatigue life between build layer heights was noticeable. X-ray Computed Tomography measured the different exterior surfaces, and the fracture surfaces were measured with SEM to understand the source of the difference in fatigue life. This result emphasizes the need for a careful build-up of experimental evidence regarding the impact of each step of added complexity in the AM process. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, Characterization |