Three-dimensional phase-field modeling of martensitic microstructure evolution in steels |
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Authors: | Hemantha Kumar Yeddu Amer MalikJohn Ågren Gustav AmbergAnnika Borgenstam |
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Affiliation: | a Department of Materials Science and Engineering, KTH Royal Institute of Technology, Brinellvägen 23, 10044 Stockholm, Sweden b Department of Mechanics, KTH Royal Institute of Technology, Osquarsbacke 18, 10044 Stockholm, Sweden |
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Abstract: | In the present work a 3-D elastoplastic phase-field (PF) model is developed, based on the PF microelasticity theory proposed by A.G. Khachaturyan and by including plastic deformation as well as anisotropic elastic properties, for modeling the martensitic transformation (MT) by using the finite-element method. PF simulations in 3D are performed by considering different cases of MT occurring in an elastic material, with and without dilatation, and in an elastic perfectly plastic material with dilatation having isotropic as well as anisotropic elastic properties. As input data for the simulations the thermodynamic parameters corresponding to an Fe-0.3%C alloy as well as the physical parameters corresponding to steels acquired from experimental results are considered. The simulation results clearly show autocatalysis and morphological mirror image formation, which are some of the typical characteristics of a martensitic microstructure. The results indicate that elastic strain energy, anisotropic elastic properties, plasticity and the external clamping conditions affect MT as well as the microstructure. |
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Keywords: | Phase-field models Martensitic phase transformation Microstructure Steels |
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