Numerical Simulation Of Iron-carbon Alloy Processing By Abrasive Flow Based On Molecular Dynamics

The rapid development of the manufacturing industry has also increased the requirements for the precision of mechanical products.As one of the most common alloy materials,iron-carbon alloys are widely used in the processing and manufacturing of precision parts.Abrasive flow processing can effectively improve the surface finish of the parts,collision and cutting of abrasive grains on the surface is the main mechanism of abrasive flow processing.In order to explore the micro-cutting phenomenon between abrasive grains and workpieces,based on micro-scale friction and material crystal structure theory.In order to explore the micro-cutting phenomenon between abrasive grains and workpieces,based on the theory of micro-scale friction and material crystal structure,the iron-carbon alloy material was taken as the research object,and the dynamic process of micro-cutting was simulated by SiC abrasive grains,which reveals the micro-cutting mechanism of the abrasive flow processing of the iron-carbon alloy material.The processing process of abrasive flow is affected by various processing factors,different factors have certain differences in process and produce different processing effects.In this study,the molecular dynamics numerical analysis of different ensemble temperature,cutting speed,cutting angle and carbon atom content(mass fraction)during the micro-cutting of iron-carbon alloy workpieces with silicon carbide abrasive grains was carried out.It is found that the ensemble temperature has the most direct influence on the atomic energy,the difference of atomic energy leads to the difference of the surface morphology of the workpiece during micro-cutting.the defect structure inside the workpiece can be reduced by appropriately increasing the ensemble temperature.Different cutting speeds and cutting angles form different cutting shapes on the surface of the workpiece,resulting in large differences in the atomic displacement of the workpiece,and at the same time causing different cutting force and energy changes.There are also significant differences in lattice and dislocation changes within the material.A large cutting speed within a certain range can improve the processing efficiency while ensuring the processing quality,a smaller cutting angle is conducive to the formation of a higher quality surface topography.The presence of carbon atoms in the iron-carbon alloy workpiece causes a certain degree of distortion of the crystal lattice,which causes local unevenness of the atomic energy distribution.As the carbon atom content increases,the deformation resistance in the material increases,and the ability to produce plastic deformation decreases.The molecular dynamics method is used to study the structural state of the workpiece material.It is found that there are atomic clusters,V-shaped dislocation loops,stacking faults and dislocation defect structures inside the workpiece during micro-cutting.The distribution of different defect structures in the workpiece is discussed,and the characteristics of the defect structure and its formation,variation and motion law are revealed.Through the molecular dynamics method,the abrasive flow processing of iron-carbon alloy materials under different processing factors was studied.The formation and evolution of the sub-surface defect structure of the workpiece were discussed.The micro-mechanism mechanism of the abrasive-flow processing iron-carbon alloy material was revealed.