The lattice dislocation trapping mechanism at the ferrite/cementite interface in the Isaichev orientation relationship

Jaemin Kim,Hadi Ghaffarian,Keonwook Kang

doi:10.1038/s41598-021-88544-6

Jaemin Kim, Hadi Ghaffarian + Show 1 more

Open Access

https://doi.org/10.1038/s41598-021-88544-6

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Abstract

We analyze the lattice dislocation trapping mechanism at the ferrite/cementite interface of the Isaichev orientation relationship by atomistic simulations combined with the anisotropic linear elasticity theory and disregistry analysis. We find that the lattice dislocation trapping ability is varied by initial position of the lattice dislocation. The lattice dislocation near the interface is attracted to the interface by the image force generated by the interface shear, while the lattice dislocation located far is either attracted to or repelled from the interface, or even oscillates around the introduced position, depending on the combination of the stress field induced by the misfit dislocation array and the image stress field induced by the lattice dislocation.

Highlights

We analyze the lattice dislocation trapping mechanism at the ferrite/cementite interface of the Isaichev orientation relationship by atomistic simulations combined with the anisotropic linear elasticity theory and disregistry analysis
They claimed that the stress field due to the lattice dislocation near the interface causes the shearing of a weak interface, and the lattice dislocation is absorbed to the interface by the image force from the interfacial shear
In pearlitic steel, a few studies reported that the ferrite-cementite interface (FCI) acts as a strong sink to dislocation when the interlamellar spacing is smaller than critical thickness[16,21]

Summary

Introduction

We analyze the lattice dislocation trapping mechanism at the ferrite/cementite interface of the Isaichev orientation relationship by atomistic simulations combined with the anisotropic linear elasticity theory and disregistry analysis. No prior study has been carried out to understand the lattice dislocation trapping mechanism based on the interface-dislocation interaction in pearlitic steel.

Results

Conclusion