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

  • Weizhao Sun
  • Yu Xie
  • Rui Yan
  • Sida Ma
  • Hongbiao DongEmail author
  • Tao JingEmail author
Topical Collection: 2019 Metallurgical Processes Workshop for Young Scholars
  • 4 Downloads
Part of the following topical collections:
  1. International Metallurgical Processes Workshop for Young Scholars (IMPROWYS 2019)

Abstract

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.

Notes

Acknowledgments

This research is financially supported by the National Key Research and Development Program of China No. 2017YFB1103700, the National Science Foundation of China Nos. 51575304 and 51674153.

Supplementary material

11663_2019_1669_MOESM1_ESM.docx (25 kb)
Supplementary material 1 (DOCX 25 kb)

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  1. 1.Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, School of Materials Science and EngineeringTsinghua UniversityBeijingChina
  2. 2.State Key Laboratory of Development and Application Technology of Automotive SteelBaoshan Iron & Steel Co., Ltd.ShanghaiChina
  3. 3.Department of EngineeringUniversity of LeicesterLeicesterUK

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