Modeling Static and Dynamic Kinetics of Microstructure Evolution in Type 316 Stainless Steel

The material genome of type 316 austenitic stainless steel is presented. The material genome is a set of constitutive equations which describes the microstructure evolution during hot forming. Single- and double-compression tests at temperatures of 950-1150 degrees C and with strain rates of 0.01-20 s(-1) were performed to obtain the kinetics of dynamic and static events. Inverse analysis, which couples a thermomechanical finite element analysis with experimental data, is used to obtain the flow curves. It compensates the effect of inhomogeneous distributions of deformation and temperature during the compression tests. The sine-hyperbolic law, which relates the flow stress and the Zener-Hollomon parameter, is used to validate the accuracy of the solution. Regression analysis is applied on the coefficients of the flow curves in order to obtain the parameters of the constitutive equations. Microstructure investigations are used to demonstrate the validity of the newly obtained material genome.