Dynamic Mechanics And Adiabatic Shear Properties Of High Carbon Silicon Manganese Steel

At present,in the field of high-speed impact,the main research materials are titanium alloys,aluminum alloys and medium carbon steels.However,the production of titanium and aluminum alloys is relatively low and the cost is relatively high.Although there are researches on medium carbon steel,the reports of high carbon steels about dynamic mechanical properties are few.If this gap can be filled by research on the dynamic mechanical properties of high carbon steel and the goal of replacing high carbon steel to medium carbon steel or even titanium alloy and aluminum alloy in the field of high-speed impact is achieved.it can effectively reduce the cost of materials and have huge economic benefits.First,by controlling the heat treatment process,this paper studies the effects of different heat treatment processes on the static and dynamic mechanics of high carbon steel.Secondly,high carbon steels and medium carbon steels with similar static mechanical properties were selected,and their dynamic mechanical tests were performed using Split Hopkinson Pressure Bar.The dynamic mechanical properties of the two were compared,and the differences between the two structures were observed using scanning electron microscopy.The differences between the two dynamic mechanical properties and the causes of crack formation in the adiabatic shear band are analyzed.Finally,based on the experiments,the J-C constitutive models of high carbon steel and medium carbon steel in this paper were fitted.After modulation treatment of high carbon steel,there is a large amount of residual carbide.When it is subjected to high-speed impact,the residual carbide makes the strain hardening stronger,the dynamic strength increases higher,the strength is more stable and the deformation is more uniform.After heat treatment of experimental steel,there will be a flaky structure that retains the flaky martensite morphology.The flaky structure will tend to disappear after high-speed impact,resulting in a change in strength,a sudden drop in dynamic stress-strain curve,fluctuations in strength,and deformation uneven.