About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing of Metals: Applications of Solidification Fundamentals
|
Presentation Title |
Eliminating Hot Tearing in Laser Powder Bed Fusion of High Strength Aluminium Alloy 2139 Through Parameter Optimisation and Grain Refinement |
Author(s) |
Joe Elambasseril, Michael Benoit, Suming Zhu, Mark A. Easton, Edward Lui, Craig Brice, Ma Qian, Milan Brandt |
On-Site Speaker (Planned) |
Mark A. Easton |
Abstract Scope |
In this work, a systematic study has been conducted to eliminate hot tearing of Al2139 alloy in laser powder bed fusion (L-PBF). In general, hot tearing of Al2139 alloy in L-PBF was reduced or eliminated by increasing energy density. Grain refiner, through the addition of a conventional Al5Ti1B master alloy to Al2139, at a level of 0.2wt%, prior to powder manufacture, has a moderate effect in reducing hot tearing as the refined grains remain predominantly columnar rather than transitioning to equiaxed. Thermomechanical finite element simulation showed that increasing energy density leads to a decrease in thermal stress during L-PBF correlating with the observation of a reduction in hot tearing. The influence of the loss of Mg at high energy densities on hot tearing of Al2139 was evaluated by thermodynamic simulation and is predicted to reduce hot tearing of Al2139 by up to 10 %, compared to the initial powder composition. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Aluminum, Solidification |