Abstract
Influence of misfit dislocations on mechanical properties of fine pearlite is investigated via uniaxial tensile deformation tests of multilayered composite models composed of ferrite and cementite phases with the Bagaryatsky relation by using molecular dynamics simulations. The analysis models have various spacing of misfit dislocations. First, we show the relationship between the misfit dislocation spacing and each component of phase stress in ferrite and cementite under no applied stress. Second, it is found that the misfit dislocation spacing influences tensile yield stresses and the dominant non-elastic phenomena, i.e. phase stresses and misfit dislocation structures influence the resolved shear stress and the critical resolved shear stress for each slip system, respectively. Therefore, the misfit dislocation spacing has a potential to be a controlling parameter of the resolved stress and the critical resolved stress for non-elastic phenomena. In addition, it has been also found that the flow stresses of the lamellar models are affected by the misfit dislocation density. That is, the misfit dislocation spacing influences the mechanical properties of fine pearlite.
