Research On Deformation And Energy Absorption Characteristics Of 35CrMo Martensitic Steel

In this paper,35CrMo low-alloy high-strength martensitic steel was studied,which is quenched and tempered to obtain three strength levels of 700 MPa,1000 MPa and 1600 MPa.Through Hopkinson device,the dynamic tensile and compression experiments were carried out to investigate the energy absorption characteristics under different strain rate s.The influence factors are analyzed so as to understand the relationships between the energy absorption and the strain rates and strength level.The constitutive equations for each level of strength of the steel are obtained based on dynamic compression results.The main conclusions of this paper are as follows:?1?The energy absorption trend of M700,M1000 and M1600 stee l in tensile and compression states is as follows:at the same strain rate,higher strength with higher total absorption energy;the energy absorption capacity increases with the increase of strain rates.?2?Under the dynamic tensile states,the energy absorption ability is mainly affected by the elongation at the time of fracture.The longer elongation,the higher energy absorption until dissociation fracture appears.Under the dynamic compression states,the energy absorption capacity is mainly affected by the strain,the higher strain,the more energy absorption.When the adiabatic shear failure occurs,the energy absorption capacity does not increase further.?3?Under dynamic compression in the strain rate range 0.25×10^-48000 s^-1,M700 and M1000 steels are consistent with the Johnson-Cook constitutive model,and the M1600 steel in6000 s^-1 conforms to the dynamic plastic constitutive model.The constitutive equations of the steels are as follows,M700 steel:?_i=(643+443.5?^0.31564)?1+0.1063ln???^*?(1-T^*1.04)M1000 steel:?_i=(1054+1575.7?^0.949)?1+0.02088ln???^*?(1-T^*1.28)M1600 steel:?_Y=1384[1+????/?10097??^1.03]...