Phase-field Simulation of Habit Plane Formation during Martensitic Transformation in Low-carbon Steels
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The origin of the habit plane of the martensite phase (<i>α</i>′) in low-carbon steels is elucidated by three-dimensional phase-field simulations. The cubic → tetragonal martensitic transformation and the evolution of dislocations with Burgers vector <i>a</i><sub><i>α</i>′</sub>/2〈111〉<sub><i>α</i>′</sub> in the evolving <i>α</i>′ phase are modeled simultaneously. By assuming a static defect in the undercooled parent phase (<i>γ</i>), we simulate the heterogeneous nucleation in the martensitic transformation. The transformation progresses with the formation of the stress-accommodating cluster composed of the three tetragonal domains of the <i>α</i>′ phase. With the growth of the <i>α</i>′ phase, the habit plane of the martensitic cluster emerges near the (111)<sub><i>γ</i></sub> plane, whereas it is not observed in the simulation in which the slip in the <i>α</i>′ phase is not considered. We observed that the formation of the (111)<sub><i>γ</i></sub> habit plane, which is characteristic of the lath martensite that contains a high dislocation density, is attributable to the slip in the <i>α</i>′ phase during the martensitic transformation.
- ISIJ International
ISIJ International 55(11), 2455-2462, 2015
The Iron and Steel Institute of Japan