Dynamic Constitutive Behavior of Additively Manufactured 17-4PH Stainless Steel

The dynamic constitutive behavior of additively manufactured (AM) 17-4PH stainless steel was investigated at various rates of compressive and tensile loading at both room and high temperatures. In accordance with common practice in current marine applications, the specimens were heat treated to H1100 condition. Experiments were conducted using an Instron 5582 Universal Tester and a Shimadzu AGX Universal Test Frame for quasi-static compression and tensile tests, respectively, and a Split Hopkinson Pressure Bar for all dynamic tests. An induction coil heating system was used for the high temperature experiments. Strain rates of 10(-3) s(-1) to 10(4) s(-1) were studied. At the dynamic strain rate of 2500 s(-1) the effects of high temperature were investigated for temperatures ranging from 22 to 1000 degrees C for compressive loading and for temperatures from 22 to 600 degrees C for tensile loading. The results show strain rate and temperature dependencies. Two Johnson-Cook models (one for compressive loading and one for tensile loading) were established to determine the dynamic plastic response of the material for various strain rates and temperatures.