A New Efficient Quantitative Multi-component Phase Field: Lattice Boltzmann Model for Simulating Ti6Al4V Solidified Dendrite Under Forced Flow

Journal Article · Sun Dec 15 04:00:00 EST 2019 · Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science

DOI:https://doi.org/10.1007/S11663-019-01669-Y· OSTI ID:22933438

Sun, Weizhao ^[1]; Xie, Yu ^[2]; Yan, Rui; Ma, Sida ^[1]; Dong, Hongbiao ^[3]; Jing, Tao ^[1]

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1. Tsinghua University, Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, School of Materials Science and Engineering (China)
2. Baoshan Iron & Steel Co., Ltd., State Key Laboratory of Development and Application Technology of Automotive Steel (China)
3. University of Leicester, Department of Engineering (United Kingdom)

Ti6Al4V is a widely used, multi-component alloy in additive manufacturing, during which the fluid flow in the molten pool significantly affects the solidified dendrites. To predict and further control the microstructure, modeling and simulating the microstructure evolution play a critical role. In this study, a newly developed, efficient, quantitative multi-component phase-field (PF) model is coupled with a lattice Boltzmann (LB) model to simulate Ti6Al4V solidified dendrite evolution under fluid flow. The accuracy and convergence behavior of the model is validated by the Gibbs–Thomson relation at the dendrite tip. Single and multiple two-dimensional (2D) equiaxed dendrite evolution cases under forced flow were simulated. Results show that the dendrite pattern is influenced remarkably by the fluid flow. Underlying mechanisms of the asymmetrical evolution are revealed by discussing the interaction among the flow, composition distribution and dendrite morphology, quantitatively. The dendrite kinetics are also derived, which ascertains the relationship between tip velocity and undercooling and inlet velocity and is the foundation for larger-scale simulation. We believe that the coupled quantitative multi-component PF–LB framework employed in this study helps in investigating the solidified dendrite morphology evolution in a deep and quantitate manner.

• OSTI ID: 22933438
• Journal Information: Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science, Journal Name: Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science Journal Issue: 6 Vol. 50; ISSN 1073-5615; ISSN MTBSEO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACCURACY
ALLOYS
CONTROL
CONVERGENCE
DENDRITES
FLUID FLOW
KINETICS
MANUFACTURING
MICROSTRUCTURE
MORPHOLOGY
SIMULATION
SUBCOOLING
TITANIUM COMPOUNDS
TWO-DIMENSIONAL SYSTEMS