Simulation of dendrite growth in the laser welding pool of aluminum alloy 2024 under transient conditions

A macroscopic heat transfer and fluid flow model is developed to calculate the temperature and velocity fields in the laser welding pool of aluminum alloy 2024. The equations of temperature gradient and solidification rate are developed to consider the transient conditions during the laser welding p...

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Bibliographic Details
Published inJournal of materials processing technology Vol. 246; pp. 22 - 29
Main Authors Wang, Lei, Wei, Yanhong, Zhan, Xiaohong, Yu, Fengyi, Cao, Xiyong, Gu, Cheng, Ou, Wenmin
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.08.2017
Elsevier BV
Subjects
Aluminum alloy
Aluminum alloys
Computational fluid dynamics
Computer simulation
Dendrite growth
Dendritic structure
Fluid flow
Heat transfer
Laser beam welding
Laser welding pool
Phase field
Solidification
Temperature gradients
Transient conditions
Welding
Laser welding pool
Transient conditions
Phase field
Dendrite growth
Aluminum alloy
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Summary:A macroscopic heat transfer and fluid flow model is developed to calculate the temperature and velocity fields in the laser welding pool of aluminum alloy 2024. The equations of temperature gradient and solidification rate are developed to consider the transient conditions during the laser welding process. The dendrite growth and solute concentration along the fusion boundary are predicted via the phase-field model under the transient conditions. The comparison of the simulation results with the measurements is carried out. Fusion profiles obtained by using a rotary-Gauss body heat source model are consistent with measurements. The computed dendrite morphology and primary dendrite arm spacing give a good agreement with experimental findings.
ISSN:0924-0136
1873-4774
DOI:10.1016/j.jmatprotec.2017.03.005