| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Towards Rapid Qualification
|
| Presentation Title |
Modeling the Effects of Surface Treatment on the Fatigue Performance of AM Ti-6Al-4V Microlattice Struts |
| Author(s) |
Kyle Jung, Kendall J Yetter, Andrew Chuang, William LePage, Michael Sangid |
| On-Site Speaker (Planned) |
Kyle Jung |
| Abstract Scope |
Surface roughness is a primary driving force in the fatigue performance of Additive Manufactured parts. We are developing a novel surface treatment strategy to smooth the surfaces of AM metal parts without line-of-sight access to the surface (e.g., microlattices) using a transient surface remelting process. This method employs conformal coatings and heat treatment to trigger a eutectic reaction on part surfaces. Treated Ti-6Al-4V struts showed reduced surface roughness and increased fatigue strength. This portion of our work focuses on microstructure characterization and modeling. Treated and non-treated parts were characterized by high resolution synchrotron-based X-ray microtomography, electron backscatter diffraction, and energy dispersive spectroscopy. Statistically equivalent synthetic microstructures were generated to incorporate grain morphology and orientations with sample geometry. Crystal plasticity simulations were performed using an elasto-viscoplastic FFT-based model to examine the relationship between surface roughness and hotspot formation. Simulation results are compared to fatigue tests of coated and non-coated struts. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, Modeling and Simulation |