About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
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Presentation Title |
Tailoring Microstructure of Selective Laser Melted TiAl-alloy with In-situ Heat Treatment via Multiple Laser Exposure |
Author(s) |
Igor Polozov, Artem Kantyukov, Anatoly Popovich, Vera Popovich |
On-Site Speaker (Planned) |
Vera Popovich |
Abstract Scope |
Intermetallic titanium aluminide (TiAl) alloys are considered as attractive materials for high temperature applications in aerospace, automotive and energy industries. Additive manufacturing is a promising way of producing complex TiAl-alloy parts, however it still remains challenging due to brittleness of the alloy. While high-temperature preheating can mitigate cracking during selective laser melting, the microstructure of TiAl-alloys still needs to be optimized to achieve better mechanical performance. In this work, multiple laser exposures were used during selective laser melting of TiAl-based alloy to tailor its microstructure. Applying additional laser exposure of up to 20 times per layer induced an in-situ heat treatment, which allowed to modify volume fraction and size of different phases. Microstructure, phase and chemical compositions, and hardness of TiAl-alloys were investigated with regards to a number of laser exposures during the selective laser melting process. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, |