Dynamic mechanical behavior and constitutive model of stainless steel

Stress-strain curves of 0Cr17Mn5Ni4Mo3Al,at three Strain rates of 300,1 000,2 700 s-1 and four temperatures of 25,300,500,700 ℃ were experimentally obtained by using the split Hopkinson pressure bar equipped with a temperature controller.And the quasi-static experiment (0.000 5 s-1) was done in the material test system at three temperatures of 25,300,500 ℃.Experimental results show that the flow stress decreases with temperature but increases with strain and strain rate.The traditional Johnson-Cook model was modified considering the thermal softening caused by the impact adiabatic process. The modified Johnson-Cook model is in good agreement with the experimental results.