| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Towards Rapid Qualification
|
| Presentation Title |
Towards Defining a Process Window in Terms of Fatigue |
| Author(s) |
Anthony D. Rollett, John Lewandowski, Sneha Narra, Albert To, Kirk Rogers, Frank Medina, Craig Brice, Jack Beuth |
| On-Site Speaker (Planned) |
Anthony D. Rollett |
| Abstract Scope |
We provide an overview of a NASA University Leadership Initiative project entitled “Development of an Ecosystem for Qualification of Additive Manufacturing Processes and Materials in Aviation”. This involved multiple universities and other collaborators working together to build a quantitative connection between AM processing, microstructure and properties in laser powder bed fusion of Ti-6Al-4V. Microstructure focused on defect structure and the key property was fatigue. The key result was that a) the defect content varied systematically across power-velocity space and was anti-correlated with fatigue life. The resulting process window was narrow compared to typical presentations. Printing the same set of 4-point bend fatigue bars in different machines at different sites produced similar results. Hypotheses are offered for the observed variations based on spatter rates and melt pool variability. We conclude that establishing a qualified materials process is feasible via an efficient survey of a limited domain of process space. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, Titanium |