Hot deformation behavior and constitutive relationship of Q420qE steel |
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Authors: | YU Bao-jun GUAN Xiao-jun WANG Li-jun ZHAO Jian LIU Qian-qian CAO Yu |
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Affiliation: | (1) Department of Mining and Metallurgy, AmirKabir University of Technology, PO Box 15875-4413, Tehran, Iran;(2) Metallurgy and Materials Engineering Department, Sabzavar Tarbiat Moallem University, PO Box 397, Sabzevar, Iran;(3) Esfarayen Steel Complex, PO Box 15896, Esfarayen, Iran |
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Abstract: | Isothermal compression tests at temperatures from 1 273 to 1 423 K and strain rates from 0.1 to 10 s−1 were carried out to investigate the flow behaviors of Q420qE steel. Stress-strain data collected from the tests were employed
to establish the constitutive equation, in which the influence of strain was incorporated by considering the effect of strain
on material constants Q, n, a, and lnA. The results show that the flow stress curves are dependent on the strain, strain rate and deformation temperature. They
display typical dynamic recrystallization behavior and consist of three stages, i.e., hardening stage, softening stage and
steady stage. The flow stress decreases with increasing the deformation temperature and decreasing the strain rate. In addition,
the flow stress data predicted by the proposed constitutive model agree well with the corresponding experimental results,
and the correlation coefficient and the average absolute relative error between them are 0.990 3 and 3.686%, respectively. |
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Keywords: | Q420qE bridge steel hot compression flow stress strain dependent constitutive equation |
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