Constitutive behavior modeling of steels under hot-rolling conditions. Materials reliability series

TL;DRAbstract

The purpose of this work is to develop constitutive equations that predict the stress-strain curves of steels as functions of hot-rolling process variables, such as temperature, strain rate, and microstructural features. Eight steels, A36, DQSK, HSLA-V, HSLA-Nb, HSLA-50/Ti-Nb, HSLA-80/Ti-Nb and two interstitial-free (IF) grades, were selectively tested at temperatures in the range from 900 to 1200 degrees C, strain rates from 1 to 50/s, and austenite grain sizes from 0.012 to 0.29 mm. The data were analyzed to support the development of constitutive models. Models for predicting stress-strain behaviors for the eight steel grades have been developed. Model predictions correlate well with the experimental data, indicating that the models adequately describe the stress-strain behaviors of various steel grades under hot-rolling conditions. Model predictions for A36 and DQSK are further validated with high strain-rate (up to 150/s) data obtained at CANMET.

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