Title: Modelling of hot compressive deformation behaviour of 55 steel considering strain

Authors: Fan Zeng; Chengliang Hu; Zhen Zhao

Addresses: Institute of Forming Technology and Equipment, Shanghai Jiaotong University, Shanghai 200030, China ' Institute of Forming Technology and Equipment, Shanghai Jiaotong University, Shanghai 200030, China ' Institute of Forming Technology and Equipment, Shanghai Jiaotong University, Shanghai 200030, China

Abstract: The hot compressive deformation behaviour of 55 steel was investigated using isothermal compression tests in the temperature range of 1,123-1,273 K and a strain rate range of 0.1-10 s⁻¹. Increased deformation temperature and decreased strain rate resulted in a lower flow stress at a given strain. With an increase in strain, most of the flow stresses increased rapidly at first, followed by a fall towards a steady state after a peak stress was reached, which was more significant at higher temperatures and a smaller strain rate. A constitutive model was established based on the Arrhenius equation. Furthermore, the influence of strain was included in the constitutive equation by considering its effect on different material constants. The accuracy of the developed constitutive equations was evaluated using standard statistical parameters. The predicted stress-strain values of 55 steel correlated well with the experimental results.

Keywords: 55 steel; deformation behaviour; Arrhenius equation; constitutive equation; flow stress; strain rate; hot workability; constitutive modelling; hot compressive deformation; deformation temperature.

DOI: 10.1504/IJMPT.2017.080571

International Journal of Materials and Product Technology, 2017 Vol.54 No.1/2/3, pp.236 - 247

Received: 16 Jun 2015
Accepted: 31 Oct 2015
Published online: 30 Nov 2016 *

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