About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
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Additive Manufacturing, Directed Energy Deposition of Metals: Processing – Microstructure – Mechanical Property Relationships
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| Presentation Title |
Process-structure relationships in laser directed energy deposition of molybdenum powder within a Ti-6Al-4V matrix |
| Author(s) |
Marwan Haddad, Mathew Cohen, Aslan Bafahm Alamdari, Brian Welk, Kamel Fezzaa, Sarah Wolff |
| On-Site Speaker (Planned) |
Marwan Haddad |
| Abstract Scope |
Alloying molybdenum (Mo) with Ti-6Al-4V (Ti64) improves the high-temperature mechanical properties of Ti64. However, the dynamic and melting behavior of Mo powder inside the Ti64 matrix and their impact on the Laser directed energy deposition (L-DED) process and the microstructure are still unclear. This study utilizes in situ high-speed X-ray and infrared imaging with material characterization to relate the L-DED process of depositing Mo powder onto a Ti64 matrix to the microstructure. Results showed that the motion of Mo powder particles inside the melt pool were governed by the convective fluid flow. The convective fluid flow achieved an overall homogeneous macro-scale chemical composition by influencing melting of Mo powder particles and liquid mixing. The increase in Mo content in Ti64 did not impact the melt pool temperature. Lastly, Mo segregated at the micro-scale near the top surface, and Mo-rich regions were located near unmmelted powder particles in the final build. |