About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Processing Effects on Microstructure and Material Performance
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Presentation Title |
Phase Field Modeling of Alloy Microstructure Formation in Rapidly Solidifying Melt Pools |
Author(s) |
Joel M. Berry, Aurelien Perron, Jean-Luc Fattebert, Saad Khairallah, Joseph T. McKeown, Manyalibo Matthews |
On-Site Speaker (Planned) |
Joel M. Berry |
Abstract Scope |
The ability to tailor and spatially grade material properties during manufacturing opens a vast design space and flexibility in component optimization with respect to size, weight, shape, etc. Laser-based additive manufacturing (AM) of metal alloys offers the potential for spatial control of microstructure and thus material properties, but requires quantitative relations between laser beam characteristics and resultant metal microstructure. Toward this aim, we quantitatively simulate crystal growth kinetics and microstructure formation in metal alloy melt pools using CALPHAD-informed phase field simulations with thermal profile input from high-fidelity multiphysics simulations. Solid phase growth mode (planar, cellular, dendritic), compositional segregation, and characteristic microstructural length scales are mapped as functions of external process parameters and compared with experimental observations and measurements. Transfer of these results to laser powder-bed fusion AM with spatial microstructural control will be discussed. Prepared by LLNL under Contract DE-AC52-07NA27344 and supported by the LDRD Program, project tracking code 18-SI-003. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |