Abstract
During laser additive manufacturing of Ti-6Al-4V, layer bands are formed approximately three layers below the heat source as it experiences multiple heating and cooling cycles that straddle the alpha to beta transformation temperature. Within the layer band the microstructure is essentially a colony structure while outside the bands a basket-weave structure is obtained. The transition in the microstructure leads to significant anisotropy in the fatigue properties of the component along and normal to the build direction. We present large scale phase field simulations with high spatial resolution, and incorporating energy contributions due to thermodynamics, interfacial and strain energies, to demonstrate the evolution of multiple variants of alpha and show that under certain thermal conditions it is possible for the microstructure to undergo the above transition.
Original language | English |
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Title of host publication | PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015 |
Editors | Long-Qing Chen, Matthias Militzer, Gianluigi Botton, James Howe, Chadwick Sinclair, Hatem Zurob |
Publisher | International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015 |
Pages | 249-255 |
Number of pages | 7 |
ISBN (Electronic) | 9780692437360 |
State | Published - 2015 |
Event | International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015 - Whistler, Canada Duration: Jun 28 2015 → Jul 3 2015 |
Publication series
Name | PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015 |
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Conference
Conference | International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015 |
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Country/Territory | Canada |
City | Whistler |
Period | 06/28/15 → 07/3/15 |
Funding
Research sponsored by the Laboratory Directed Research and Development program at Oak Ridge National Laboratory, managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy. This research used resources of the Center for Computational Sciences at Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under contract DE-AC05-00OR22725.
Keywords
- Additive manufacturing
- Basket weave
- Colony
- Phase field