Experimental Development of Johnson–Cook Strength Model for Different Carbon Steel Grades and Application for Single‐Pass Hot Rolling

Johnson–Cook (JC) high‐temperature strength material models have been widely used in finite‐element analysis (FEA) to solve variety of hot rolling problems. Herein, the temperature‐ and strain rate‐related parameters of JC model are experimentally calibrated for eight different steel grades including SAE 1018 and SAE 1045, structural steels (ASTM A572‐60, ASTM A690, and ASTM A992), two V‐modified 1535/45 grades, and one automotive advanced high‐strength steel grade. Experimental data are obtained from tensile tests performed at strain rates from 0.001 to 20 s−1 and at temperatures between 900 and 1200 °C. A genetic algorithm approach is used to determine JC model parameters for different steel chemistries and to calculate the rolling pressure for a simple flat rolling process using both a common analytical formulation and a finite‐element model (FEM). A model for the effects of steel chemistry on the JC model parameters is also discussed. The temperature‐ and strain rate‐related parameters of Johnson–Cook (JC) model are experimentally calibrated for eight different steel grades using tensile data at strain rates from 0.001 to 20 s−1 and at temperatures between 900 and 1200 °C. JC models can be utilized to model deformation processes (analytically and by finite‐element analysis) at high temperature, such as the hot rolling.