|Phase-field modeling of Widmanstatten ferrite formation during isothermal transformation in low carbon steels|
|W. Yan; N. M. Xiao; Y. Chen; D. Z. Li
|Source Publication||Computational Materials Science
|Abstract||The simulation of Widmanstatten ferrite formation, developing from grain-boundary ferrite allotriomorphs during the isothermal austenite to ferrite transformation in binary Fe-C alloys, has been realized using Loginova and KKS phase-field models. It was found that the KKS model can quantitatively predict the transformation kinetics at a larger interfacial thickness comparing with the Loginova model. The plate spacing predicted by the KKS model is more comparable with the experimental result. Both models show that lengthening rates of plates increase linearly with increasing interfacial thickness. The simulation results demonstrate that the formation of Widmanstatten ferrite plates with realistic morphologies requires high anisotropy of interface energy. The increased strength of anisotropy causes a higher lengthening rate of Widmanstatten ferrite plate. A large interfacial energy leads to a high growth velocity of broad sides of Widmanstatten ferrite plate. The disappearance of some plates and the coalescence of two adjacent plates coarsen plate spacing, which is in good agreement with the experimental observation. The lengthening rate increases and the plate spacing decreases with increasing degree of undercooling. As the supersaturation is increased the plate lengthening rate is obviously improved and the spacing of ferrite group is refined. (C) 2013 Elsevier B.V. All rights reserved.|
; xiao, namin
; chen, yun
; li, dianzhong] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china.
; xiao, nm (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china.
W. Yan,N. M. Xiao,Y. Chen,et al. Phase-field modeling of Widmanstatten ferrite formation during isothermal transformation in low carbon steels[J]. Computational Materials Science,2014,81:503-509.
W. Yan,N. M. Xiao,Y. Chen,&D. Z. Li.(2014).Phase-field modeling of Widmanstatten ferrite formation during isothermal transformation in low carbon steels.Computational Materials Science,81,503-509.
W. Yan,et al."Phase-field modeling of Widmanstatten ferrite formation during isothermal transformation in low carbon steels".Computational Materials Science 81(2014):503-509.
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