Role of disconnections in mobility of the austenite-ferrite inter-phase boundary in Fe

Abstract

Austenite (γ-Fe, face centered cubic (FCC)) to ferrite (α-Fe, body centered cubic (BCC)) phase transformation in steel is of great significance from the point of view of industrial applications. In this work, using classical molecular dynamics simulations, we study the atomistic mechanisms involved during the nucleation and growth of the ferrite phase embedded in an austenite phase. We find that the disconnections present at the inter-phase boundary can act as the nucleation centers for the ferrite phase. Relatively small interface velocities (1.19 - 4.67 m/s) confirm a phase change via massive transformation mechanism. Boundary mobilities obtained in a temperature range of 1000 to 1400 K show an Arrhenius behavior, with activation energies ranging from 30 - 40 kJ/mol.

arXiv comment8 pages, 7 figures

References in corpus (5)

• Electronic correlations at the alpha-gamma structural phase transition in paramagnetic iron
• Calculated phonon spectra of paramagnetic iron at the alpha-gamma phase transition
• Dynamic Simulation of Structural Phase Transitions in Magnetic Iron
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• Nonlocal correlations in the vicinity of the $\alpha$-$\gamma$ phase transition in iron within a DMFT plus spin-fermion model approach

Cited by in corpus (1)

• Role of interface morphology on the martensitic transformation in pure Fe