Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/42605
Title: Phase-field modeling of nonequilibrium solidification processes in additive manufacturing
Authors: Allen, Jeffrey B.
Moser, Robert D.
McClelland, Zackery B.
Islam, Md Mohaiminul
Liu, Ling
Keywords: Additive manufacturing
Dendrites--Growth
Binary systems (Metallurgy)
Solidification
Directional solidification
Publisher: Information Technology Laboratory (U.S.)
Geotechnical and Structures Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC TR-21-21
Abstract: This project models dendrite growth during nonequilibrium solidification of binary alloys using the phase-field method (PFM). Understanding the dendrite formation processes is important because the microstructural features directly influence mechanical properties of the produced parts. An improved understanding of dendrite formation may inform design protocols to achieve optimized process parameters for controlled microstructures and enhanced properties of materials. To this end, this work implements a phase-field model to simulate directional solidification of binary alloys. For applications involving strong nonequilibrium effects, a modified antitrapping current model is incorporated to help eject solute into the liquid phase based on experimentally calibrated, velocity-dependent partitioning coefficient. Investigated allow systems include SCN, Si-As, and Ni-Nb. The SCN alloy is chosen to verify the computational method, and the other two are selected for a parametric study due to their different diffusion properties. The modified antitrapping current model is compared with the classical model in terms of predicted dendrite profiles, tip undercooling, and tip velocity. Solidification parameters—the cooling rate and the strength of anisotropy—are studied to reveal their influences on dendrite growth. Computational results demonstrate effectiveness of the PFM and the modified antitrapping current model in simulating rapid solidification with strong nonequilibrium at the interface.
Description: Technical Report
Gov't Doc #: ERDC TR-21-21
Rights: Approved for Public Release; Distribution is Unlimited
URI: https://hdl.handle.net/11681/42605
http://dx.doi.org/10.21079/11681/42605
Appears in Collections:Technical Report

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