The Study Of Fe-mn-c Alloys With Experiment And Molecular Dynamic Simulation

Fe-Mn-C Alloys played an important role in many industries,but have not yet reached unified conclusion until now about the research of Macro and microcosmic mechanism.The paper studies it from calculation and experiments.It is different between simulation system and experimental materials.At the experimenntal level, wear behaviors of the high manganese steel under the condition of different rolling reduction rates.observed by TEM, AFM and other general test methods. At the simulation level, Using CASTEP calculation program, studying the performances of different C, Mn contents in Fe-Mn-C austenitic alloys were theoretically forecasted.The research work made it possible for further study as theoretical basis. The research indicates:1) The straight distortion belts as well as the twin distortion start to present at the small deformation, and the dislocation configuration exhibits for the straight banding. Along with deformation quantity's augmentation, the twin crystals quantity increases and the twin crystals density increases obviously. After the reduction quantity achieves the certain extent, twin crystals quantity increasing rate tends to slow down, and a few secondary twin crystals present in the twin crystals.2) Wear resistance increased with the reduction rates increasing when deformation is less than twenty percent.The reasons are high manganese steel by severe cold-rolling form a high density of dislocation and the twins.They can effectively prevent the surface of brittle spalling caused by abrasive wear.At the same time,good toughness in center of High-manganese steel will reduce the fatigue spalling in the process of abrasive. Because of Crack expansion, wear resistance reduced with the reduction rates increasing when reduction is more than twenty percent.3) With the Mn content increasing, the C1 1 and Elastic moduli increased, but C1 2 and C 44decreased. B and G increased with the C Mn content increasing Fe-Mn-C alloy have low stacking fault energy, and they increased with the Mn content increasing.