Effects of shear flows on columnar dendritic microstructure during rapid solidification of IN718 alloy: A cellular automaton-lattice Boltzmann modeling study

Boyang Chen; Qingyu Zhang; Dongke Sun; Zhijun Wang

doi:10.1016/j.jcrysgro.2022.126583

Effects of shear flows on columnar dendritic microstructure during rapid solidification of IN718 alloy: A cellular automaton-lattice Boltzmann modeling study

Boyang Chen, Qingyu Zhang, Dongke Sun, Zhijun Wang

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The growth of columnar dendrites during rapid directional solidification of IN718 alloy in the presence of shear flows is simulated by using a coupled cellular automaton-lattice Boltzmann (CA-LB) model. The developed CA-LB model is benchmarked by the mesh independency of the steady-state dendrite growth velocity and the primary dendrite arm spacing (PDAS) under different cooling rates. The CA-LB model is then applied to simulate the columnar dendrite growth under different shear flows and cooling rates in the conditions of rapid solidification. The values of PDAS under different conditions are determined from the simulation results, and are correlated with the shear flow rate (U_sh) and cooling rate (CR). A unified fitting formula is developed to represent the effects of U_sh and CR on the evolution of PDAS. The PDAS is found to decrease with CR increasing, but increase with U_sh increasing. Moreover, it is revealed that the influence of U_sh on PDAS becomes stronger as CR increases.

Original language	English
Article number	126583
Journal	Journal of Crystal Growth
Volume	585
DOIs	https://doi.org/10.1016/j.jcrysgro.2022.126583
State	Published - 1 May 2022

Keywords

A1. Convection
A1. Dendrites
A1. Growth models
A1. Solidification
B1. Alloys

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10.1016/j.jcrysgro.2022.126583

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title = "Effects of shear flows on columnar dendritic microstructure during rapid solidification of IN718 alloy: A cellular automaton-lattice Boltzmann modeling study",

abstract = "The growth of columnar dendrites during rapid directional solidification of IN718 alloy in the presence of shear flows is simulated by using a coupled cellular automaton-lattice Boltzmann (CA-LB) model. The developed CA-LB model is benchmarked by the mesh independency of the steady-state dendrite growth velocity and the primary dendrite arm spacing (PDAS) under different cooling rates. The CA-LB model is then applied to simulate the columnar dendrite growth under different shear flows and cooling rates in the conditions of rapid solidification. The values of PDAS under different conditions are determined from the simulation results, and are correlated with the shear flow rate (Ush) and cooling rate (CR). A unified fitting formula is developed to represent the effects of Ush and CR on the evolution of PDAS. The PDAS is found to decrease with CR increasing, but increase with Ush increasing. Moreover, it is revealed that the influence of Ush on PDAS becomes stronger as CR increases.",

keywords = "A1. Convection, A1. Dendrites, A1. Growth models, A1. Solidification, B1. Alloys",

author = "Boyang Chen and Qingyu Zhang and Dongke Sun and Zhijun Wang",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",

year = "2022",

month = may,

day = "1",

doi = "10.1016/j.jcrysgro.2022.126583",

language = "英语",

volume = "585",

journal = "Journal of Crystal Growth",

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TY - JOUR

T1 - Effects of shear flows on columnar dendritic microstructure during rapid solidification of IN718 alloy

T2 - A cellular automaton-lattice Boltzmann modeling study

AU - Chen, Boyang

AU - Zhang, Qingyu

AU - Sun, Dongke

AU - Wang, Zhijun

PY - 2022/5/1

Y1 - 2022/5/1

N2 - The growth of columnar dendrites during rapid directional solidification of IN718 alloy in the presence of shear flows is simulated by using a coupled cellular automaton-lattice Boltzmann (CA-LB) model. The developed CA-LB model is benchmarked by the mesh independency of the steady-state dendrite growth velocity and the primary dendrite arm spacing (PDAS) under different cooling rates. The CA-LB model is then applied to simulate the columnar dendrite growth under different shear flows and cooling rates in the conditions of rapid solidification. The values of PDAS under different conditions are determined from the simulation results, and are correlated with the shear flow rate (Ush) and cooling rate (CR). A unified fitting formula is developed to represent the effects of Ush and CR on the evolution of PDAS. The PDAS is found to decrease with CR increasing, but increase with Ush increasing. Moreover, it is revealed that the influence of Ush on PDAS becomes stronger as CR increases.

AB - The growth of columnar dendrites during rapid directional solidification of IN718 alloy in the presence of shear flows is simulated by using a coupled cellular automaton-lattice Boltzmann (CA-LB) model. The developed CA-LB model is benchmarked by the mesh independency of the steady-state dendrite growth velocity and the primary dendrite arm spacing (PDAS) under different cooling rates. The CA-LB model is then applied to simulate the columnar dendrite growth under different shear flows and cooling rates in the conditions of rapid solidification. The values of PDAS under different conditions are determined from the simulation results, and are correlated with the shear flow rate (Ush) and cooling rate (CR). A unified fitting formula is developed to represent the effects of Ush and CR on the evolution of PDAS. The PDAS is found to decrease with CR increasing, but increase with Ush increasing. Moreover, it is revealed that the influence of Ush on PDAS becomes stronger as CR increases.

KW - A1. Convection

KW - A1. Dendrites

KW - A1. Growth models

KW - A1. Solidification

KW - B1. Alloys

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U2 - 10.1016/j.jcrysgro.2022.126583

DO - 10.1016/j.jcrysgro.2022.126583

M3 - 文章

AN - SCOPUS:85124973639

SN - 0022-0248

VL - 585

JO - Journal of Crystal Growth

JF - Journal of Crystal Growth

M1 - 126583

ER -

Effects of shear flows on columnar dendritic microstructure during rapid solidification of IN718 alloy: A cellular automaton-lattice Boltzmann modeling study

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Keywords

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