Comparative study on material models for BS 080M46 medium carbon steel

This work focused on studying the flow behavior of BS 080M46 medium carbon steel through hot compression tests, covering a deformation temperature of 900, 1000, 1100, and 1200°C and strain rates varying from 0.1 to 10 s^-1. The purpose of this work was to effectively predict the flow behavior of the material at elevated temperatures using two different constitutive models: the Arrhenius-based and the Hansel-Spittel model. The application of the regression method involved fitting the experimental stress-strain data to obtain the material constants for these models. A comparison was made between the experimental and predicted flow stresses based on the two constitutive models, demonstrating a strong correlation with the experimental data. The developed Arrhenius-based constitutive model exhibited greater accuracy and reliability in its predictability compared to the Hansel-Spittel constitutive model, with AARE of 7.5231%, an RMS of 7.3565 MPa, and an R value of 0.98450. To further validate the predictive capability of the two constitutive models, they were incorporated into finite element software to conduct simulations of the hot compression tests. Comparing the actual load-displacement curves with those obtained curves obtained through finite element simulations revealed a comparable consistency between the predicted and actual load-displacement curves.