Research on the interface effect of ferrite-cementite phase by molecular dynamics
Pearlite is a very important microstructure.Therefore,a model of the ferrite-cementite phase inter-face is constructed in this paper,and the process of nano-intrusion is simulated by molecular dynamics simula-tion method.By analyzing the mechanical properties and microstructure of the simulation results,the ferrite-ce-mentite phase interface effect was explored.It is found that the indenter load increases with the increase of the distance between the indenter and the grain boundary at different distances(positions of indentation)from the ferrite-cementite grain boundary.When the indentation depth reaches a certain depth,the load decreases with the increasing distance.Young's modulus and maximum shear modulus are directly affected by the atomic struc-ture below the indenter tip,and hardness is affected by both the structural integrity and type.The cementite phase interface affects the nucleation,proliferation and expansion of dislocations during the nano-indentation process,and the macroscopic performance is the difference of the indenter load at different indentation positions under the same indentation depth.
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