A combined Johnson–Cook and Zerilli–Armstrong model for hot compressed typical high-strength alloy steel

The effects of strain rate and forming temperature on the deformation behaviors of typical high-strength alloy steel were investigated by uniaxial hot compression tests with the temperature range of 850–1150 °C and strain rates of 1–50 s−1. Based on the experimental results, the Johnson–Cook and Zerilli–Armstrong models were established for the studied alloy steel. However, the comparisons between the measured and predicted flow stress by Johnson–Cook and Zerilli–Armstrong models indicate some significant deviations in most loading conditions. This is because these two models overlook the coupled effects of strain rate–temperature–strain. Therefore, a combined Johnson–Cook and Zerilli–Armstrong (JC–ZA) model was developed to describe the relationship of the flow stress, strain rate and forming temperature. Results show that the stress–strain values predicted by the proposed model well agree with experimental ones, which confirmed that the combined JC–ZA model gives an accurate and precise estimate of the flow stress for the studied typical high-strength alloy steel.