Original scientific paper

High temperature constitutive model of q345B steel

W. C. Pei ; College of Mechanical Engineering, North China University of Science and Technology, Hebei, Tangshan, China
W. Q. Wu ; College of Mechanical Engineering, North China University of Science and Technology, Hebei, Tangshan, China
Y. Hu ; College of Mechanical Engineering, North China University of Science and Technology, Hebei, Tangshan, China
H. C. Ji orcid.org/0000-0002-1592-6362 ; College of Mechanical Engineering, North China University of Science and Technology, Hebei, Tangshan, China

Abstract

In order to accurately predict the flow stress of Q345B steel at high temperature, the Q345B steel was subjected to a hot compression test on the Gleeble-1500D thermal simulation test machine at a deformation temperature of 1 173,15~1 373,15 K and a strain rate of 0,01~10 s-1. Through the obtained true stress-strain curve, strain factors are introduced into the Arrhenius equation to establish a more accurate strain-coupled constitutive model. The results show that the correlation coefficient of the Arrhenius model considering strain compensation is 0,993, and the average absolute error is 4,59 %, which can accurately predict the flow stress. The experimental data and the calculated prediction curve fit well, which verifies the feasibility of the model.

Keywords

Q345B; thermal compression test; stress-stain curves; temperature; constitutive mode

Hrčak ID:

273840

URI

https://hrcak.srce.hr/273840

Publication date:

1.7.2022.

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