About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Materials Design and Alloy Development V – Design Fundamentals
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Presentation Title |
Microstructural Engineering of Metastable Ti-Al-V-Fe Alloy via In Situ Alloying during Laser Powder Bed Fusion |
Author(s) |
Ming Chen, Steven Van Petegem , Zhiyi Zou, Marco Simonelli , Yau Yau Tse, Helena Moens-Van Swygenhoven |
On-Site Speaker (Planned) |
Ming Chen |
Abstract Scope |
The application of blended powders in Laser Powder Bed Fusion offers considerable freedom to print alloys and tune phase composition. β-Ti phase is stabilized in Ti6Al4V-based alloys by adjusting chemical composition of powder mixtures to obtain desired mechanical properties. We demonstrate that using a blended powder consisting of Ti6Al4V with Fe particles, as-built microstructures and phase composition are varied from almost complete α’ to β dominant by simply decreasing the volume energy density in the L-PBF process. Synchrotron operando X-ray diffraction demonstrate the phase evolution and temperature profiles for different energy inputs and show the direct stabilization of β phase to ambient temperature even under rapid cooling (106 K/s). β-Ti phase dominant samples show high strength and enhanced ductility in as-build conditions. Our study offers an effective method to engineer site-specific microstructures and mechanical properties by simply tuning locally laser parameters, while using the same blended powder for entire sample. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Titanium, Mechanical Properties |