Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (1): 43-47.DOI: 10.12068/j.issn.1005-3026.2019.01.009

• Materials & Metallurgy • Previous Articles     Next Articles

Constitutive Equations for Moderate-Temperature Deformation of Fe-6.5%Si Steel

MEI Rui-bin1,2, BAO Li1, LI Chang-sheng2, LIU Xiang-hua2   

  1. 1. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China; 2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Received:2017-04-29 Revised:2017-04-29 Online:2019-01-15 Published:2019-01-28
  • Contact: MEI Rui-bin
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Abstract: Using Gleeble 3500, the deformation behaviors of a single-pass compression for Fe-6.5%Si steel at temperature ranging from 300 to 600℃ and strain rate ranging from 0.05 to 5s-1 were studied. The flow stress increases dramatically at initial uniform plastic deformation stage due to work hardening, while the increment of flow stress is to be weakened during further deformation when the dynamic softening occurs. The strain hardening index decreases with increasing the temperature and decreasing the strain rate. A new constitutive model of Fe-6.5%Si steel at moderate-temperature deformation was proposed through describing the strain hardening index as the function of temperature and strain rate. The results predicted by this model are in good agreement with the experimental data, with an average relative error about 5.35%.

Key words: Fe-6.5%Si steel, strain hardening index, flow stress, moderate-temperature deformation, constitutive equation

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