|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||The Effect of the Misfit Dislocation on the In-plane Shear Response of the Ferrite/Cementite Interface
||Jaemin Kim, Keonwook Kang, Seunghwa Ryu
|On-Site Speaker (Planned)
In order to deepen the understanding of the mechanical behaviors of pearlite in the small lamellar spacing limit, it is essential to characterize the structures of the ferrite/cementite interface (FCI) and compute the strengths. In this study, we analyzed the in-plane shear deformation of the FCI using atomistic simulation combined with extended atomically informed Frank-Bilby (xAIFB) method and disregistry analysis. We applied in-plane shear stress along 12 different directions to the ferrite/cementite bilayer for Isaichev (IS), Near Bagaryatsky (Near BA) and Near Pitsch-Petch (Near PP) orientation relationship (OR), respectively. The simulation results reveal that IS and Near BA ORs show dislocation-mediated plasticity except two directions, while Near PP OR shows mode II fracture at the FCI along all directions. Based on the xAIFB and disregistry analysis results, we conclude that the in-plane shear behavior of the FCI is governed by characteristics of misfit dislocation and bond strength at the FCI.
||Planned: Supplemental Proceedings volume