CET of Inconel 718 Alloy during Directional Solidification Based on Phase-field Simulation
The CET(Columnar to equiaxed crystal transition)process of Inconel 718 alloy during directional solidifica-tion was numerically simulated based on multi-phase field model.The CET solidification structure was explored under different temperature gradients,and dendrite evolution law of equiaxed,columnar,and mixed crystals were investi-gated.In addition,the concentration variation patterns of Nb and Cr along height direction were also analyzed.The results indicate that the solidification mode of Inconel 718 alloy is converted from columnar to equiaxed crystals as the temperature gradient decreased from 400 K/cm to 10 K/cm.During the solidification process,Nb is segregated in the liquid phase,while Cr is segregated in the solid phase.
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