Interfacial-dislocation-controlled deformation and fracture in nanolayered composites: Toward higher ductility of drawn pearlite

Interactions between Dislocations and Boundaries during Deformation

“…For example, several models and simulations have been performed to explain the dislocation transmission mechanism across the ferrite–cementite interface in pearlitic steels [ 22 , 30 , 122 , 131 , 132 , 133 , 134 ]. However, the direct dislocation transmission across the interface has not been confirmed through experimental observations.…”

“…There is few solid evidence of the dislocation transmission across a ferrite–cementite interface by means of direct transmission, although the slip transfer has been observed in the pearlite. The feasibility of dislocation transmission is researched by using LRB criteria [ 132 , 133 ], dislocation transmission mechanism m′ (mentioned in Section 3.1 ) [ 30 ] and simulation [ 122 , 131 , 134 ]. According to LRB criteria, two {110}<111> slip systems and one {112}<111> slip system of ferrite are possible to transmit across the ferrite–cementite interface.…”

Influence of M ₂₃C ₆ Carbides on the Heterogeneous Strain Development in Annealed 420 Stainless Steel

“…10 , the initial state, without applied load, does include lattice distortion around the boundaries, which can be attributed to a misfit strain due to thermal stress during cooling in the process. The initial residual stress may assist in a plasticity initiation by dislocation nucleation/multiplication as indicated by Shimokawa et al [54] . This can be a reason for the lower flow stress leading to the lower hardening rate as shown in Figs.…”

Molecular Dynamics Simulation of the Effect of Cementite Decomposition on Yield Phenomena in Pearlite Microstructure

“…[11][12][13][14] Furthermore, the interfacial dislocation structure and interfacial energies for each OR have been thoroughly investigated using atomic simulations, [15][16][17] as are the interfacial mediated plastic deformations. [18][19][20][21] There is a strong correlation between the interfacial dislocation density and the phase stress; the former affects the activated plastic deformation mode's critical resolved stress. The latter affects its driving force; hence, the interfacial dislocation density can be a dominant factor in the activated plastic deformation mode.…”