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Investigation of heat transfer, dendrite growth, Nb segregation, competitive growth, and remelting process during wire-arc directed energy deposition of IN718 using a multi-scale, multi-dimension, and multi-area phase field model(M3-PFM)
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DOI：10.1016/j.ijheatmasstransfer.2024.126455.png)
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Abstract
En 中文
In this work, a multi-scale, multi-dimension and multi-area phase field model is established to simulate the heat transfer, dendrite growth, Nb segregation, competitive growth, and remelting process during wire-arc directed energy deposition of IN718. The primary dendrite arm spacing increases from 6.09 mu m to 8.0 mu m with decreasing cooling rate from bottom to top, which aligns closely with the experimental results. The maximum segregation of Nb is about 14.9 wt.% in simulation results, which is consistent with experimental 15.3 wt.%. During competitive growth, the solute concentrations at the tips of the dendrites gradually increase as the grain orientations increase, while the dendrite lengths gradually decrease. After remelting, the grain growth mode can be divided into three types: continuous growth, branched, and eliminated. The primary dendrite arm spacing increases slightly, from 6.54 mu m to 7.50 mu m, which agrees well with experimental values of 6.71 mu m before and 7.14 mu m after remelting respectively.
Keywords:
Dendrite growth
Nb segregation
Competitive growth
Remelting
M3-PFM
Wire-arc directed energy deposition
Journal
IF:
5.8
Papers:
2.5W
Citations:
10.2W