Numerical Simulation Of Impact Hardening And Research Of Constitutive Equation Under High Strain Rate Of Hadfield Steel

It is a hot research topic of metal materials dynamic mechanical properties toscientific researcher. However, because of limiting of technology, there is no reportconcerning constitutive equation under high strain rate of Hadfield steel, so it has a limitto research and exploration of metal materials dynamic mechanical properties at a certaindegree.Constitutive equation under high strain rate was an object of study. The influence ofstrain rate on the plastic deformation of the metals was significant during the high strainrate of loading. However, it was very difficult to obtain high strain rate data (≥104s^-1) byexperimental technique. Therefore, the finite element method and iterative method wereemployed in this study. Numerical simulation was used to characterize the deformationbehavior of Hadfield steel during explosive treatment. Base on experimental data, amodified Johnson-Cook equation for Hadfield steel was fitted:σ=(340+700×15^ε-0.1ε^0.385(1+7.4×10^-3ε^0.4lnε^*). The new model can be used to describeor predict the stress–strain relation of the metals deformed over a wide range of strain rate.The explosive hardening of Hadfield steel was simulated by ABAQUS finite element code.The development of four field variables were quantified during explosive hardening by themodel: displacement, equivalent plastic strain, equivalent stress and strain rate. What'smore, explosion time and load for explosion hardening are investigated deeply in thiswork. With the help of Origin, all the graphs are finished.Hardening hardening was another object of study. Several limitations of explosionhardening which is a widely method are found in the practice, such as economic, security,technology and so on. On the base of a great deal of material, application of severalattacks on small energy can effectively improve the hardness of Hadfield steel, therebyincreasing its wear resistance. Base on experiment, the impact hardening of Hadfield steelwas simulated by ABAQUS finite element code, preliminary results demonstrated thefeasibility of this method. Moreover, the effect of load, time and frequency on hardeneddepth is studied. Origin is applied to achieve all the graphs. The development ofequivalent plastic strain field is quantified during impact hardening. It is of some technological value to develop of materials processing technology and select relatedequipment.