Abstract
A phase-field simulation is performed to study the substructure evolution of lenticular martensite in TRIP steels. The evolution of martensitic phase variants and dislocations is calculated by a coupled phase-field micro-elasticity model. The simulations at isothermal conditions show that during the phase transformation, the accommodation dislocations evolving in the austenite are inherited by the martensitic phase and cause the further evolution of a single martensitic variant in the direction of the dislocation slip. As a result of the interaction, a change of the growth mode from twining to slip can be observed in accordance to the substructure formation of lenticular martensite. This interaction between the dislocations and martensitic phase depends on dislocation slip systems and the orientation of the martensitic variants as well as on the energy barriers for the phase transformation and for the dislocation motion.
Highlights
The interaction between the martensitic transformation (MT) front and plastic deformation is one of the most important phenomenon in the theory of solid-solid transformations due to their numerous applications in material science
During MT, the accommodation dislocations evolve in the austenitic matrix and interact with the transformation front
The phase-field kinetic equation for a slip system α in dimensionless form is similar to the martensitic phase transformation
Summary
The interaction between the martensitic transformation (MT) front and plastic deformation is one of the most important phenomenon in the theory of solid-solid transformations due to their numerous applications in material science. The study of the interaction of solid-solid phase transformation and dislocation evolution by means of the phase-field model were started by Levitas et al [19]. A similar phase-field approach is adopted in the present work to study the effect of individual dislocations distributed in the austenite near the MT front on the substructure formation during the growth of a single plate of. We developed a continuous approach which combines the phase field model of MT with the evolution of the plastic strain and the dislocation density field calculated by the slip evolution law [22, 23] This approach uses phenomenological interaction parameters which have to be estimated. We simulate the evolution of a martensitic plate with and without dislocations and show the transition from the twinned to untwinned region in the presence of the dislocations of a specific slip system
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