About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
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Symposium
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Additive Manufacturing of Titanium-based Materials: Processing, Microstructure and Material Properties
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Presentation Title |
Modeling and Characterizing the Effects of Keyhole Porosity on Simulated Ti-6Al-4V Powder-Bed Fusion Microstructures |
Author(s) |
Brodan Richter, Joshua D. Pribe, Samuel J.A. Hocker, Joseph N. Zalameda |
On-Site Speaker (Planned) |
Brodan Richter |
Abstract Scope |
Defects are a primary contributor to the poor fatigue life of powder-bed fusion (PBF) parts. The occurrence and effect of defects must be understood to build confidence in PBF part performance. The keyhole porosity defect is due to the creation and collapse of a keyhole cavity within the melt pool at high-energy processing conditions. The effect that keyhole porosity has on the crystalline microstructure of Ti-6Al-4V remains poorly understood. This work presents results from experimentally informed seeding of keyhole porosity into meso-scale kinetic Monte Carlo PBF process models. The impact of the keyhole porosity on the grain statistics and crystallographic texture are characterized and presented. This work furthers understanding of the impact of keyhole porosity on PBF microstructure and provides a direction for improved additive manufactured part confidence. The incorporation of keyhole porosity also supports a larger PBF Process-Structure-Performance modeling framework for enabling the qualification and certification of PBF parts. |