Journal
COMPUTATIONAL MATERIALS SCIENCE
Volume 82, Issue -, Pages 525-530Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.commatsci.2013.08.022
Keywords
Dendrite growth; Phase field (PF); Welding pool; Transient conditions; Primary dendrite arm spacing; Aluminum alloy
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Funding
- National Natural Science Foundation of China [51174065]
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A phase field (PF) model is developed to investigate the microstructure evolution near the fusion line during solidification of the gas tungsten arc welding (GTAW) pool for aluminum alloy 2A14. The equations of temperature gradient and pulling speed are employed to consider the transient conditions of the welding pool. Time evolutions of the dendrite growth and tip velocity are obtained. The dendrite growth can be divided into the planar growth stage, competitive growth stage and short-term steady growth stage. The trends of tip velocity are distinctly different with that of the pulling speed in different stages. Thermal undercooling and constitutional undercooling have different dominating effects on the tip velocity, which results in the fact that the time point when the tip velocity reaches its peak value is inconsistent with that of both thermal undercooling and constitutional undercooling. For the given welding parameters, the average primary dendrite arm spacing obtained by the simulation agrees well with the experimental results. Moreover, during the simulation, the side branches grow at an angle with a velocity component perpendicular to the primary dendrite orientation, which is consistent with the experiments. (C) 2013 Elsevier B.V. All rights reserved.
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