About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques III
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Presentation Title |
Controlling Microstructure of Additively Manufactured Ti-6Al-4V through In-situ Selective Laser Heat Treatment |
Author(s) |
Reza Esmaeilzadeh, Milad Hamidi-Nasab, Charlotte deFormanoir, Lucas Schlenger, Steven Van Petegem, Claire Navarre, Cyril Cayron, Nicola Casati, Daniel Grolimund, Roland Logé |
On-Site Speaker (Planned) |
Steven Van Petegem |
Abstract Scope |
This study investigates in-situ Selective Laser Heat Treatment (SLHT) for modifying the microstructure of LPBF Ti-6Al-4V. As-built Ti-6Al-4V parts typically exhibit a martensitic microstructure, requiring post-process heat treatment to achieve desired ductility. This research demonstrates that SLHT can effectively induce the decomposition of martensite into a lamellar α+β microstructure within a short time frame (~30s). It involves rescanning the printed surface, triggering solid-state phase transformations. Operando X-ray diffraction and thermal finite element simulations were utilized to probe the kinetics of martensite decomposition. The results show a gradual formation of the β phase and a narrowing trend in the α/α' peak, indicating the diffusional nature of decomposition. By fine-tuning the SLHT parameters, a controlled cooling cycle is obtained, preserving the β phase at room temperature. Microstructural characterizations confirm the presence of the α+β microstructure after SLHT. This approach eliminates post-processing steps, allowing for the creation of architected microstructures by LPBF. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Titanium, Characterization |