Constitutive equation for hot deformation of F45MnVS steel

KANG Di-na; PANG Yu-hua; LUO Yuan; SUN Qi; LIN Peng-cheng; LIU Dong

doi:10.13228/j.boyuan.issn0449-749x.20190561

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Iron and Steel ›› 2020, Vol. 55 ›› Issue (9) : 104-110. DOI: 10.13228/j.boyuan.issn0449-749x.20190561

Materials

Constitutive equation for hot deformation of F45MnVS steel

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Abstract

In order to establish the constitutive model of F45MnVS steel which can meet the calculation accuracy,the isothermal compression experiment of the steel was completed by Gleeble-3500 testing machine,and the rheological behavior of the metal was obtained when the deformation temperature was from 800 to 1 000 ℃,the strain rate was from 0.01-10 s^-1,and the deformation was from 0 to 70%. The results show that the change of stress with strain has the characteristics of dynamic recrystallization,and the stress increases with the decrease of deformation temperature and the increase of strain rate. Based on the analysis of parameters between Arrhenius and Zener-Hollomon equation,the activation energy Q of thermal deformation was obtained,and the peak stress constitutive model was established. Based on the stress dislocation relationship and dynamic recrystallization dynamics,the mechanism constitutive model of two stages of work hardening dynamic recovery and dynamic recrystallization was established,which was used to describe the relationship between stress and strain at different deformation temperature and strain rate. The model was used to predict the stress and strain under different deformation conditions. Compared with the experimental results,the correlation coefficient was 0.997 and the agreement was high.

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F45MnVS steel / constitutive equation / activation energy of thermal deformation / dynamic recovery / dynamic recrystallization

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KANG Di-na, PANG Yu-hua, LUO Yuan, et al. Constitutive equation for hot deformation of F45MnVS steel[J]. Iron and Steel, 2020, 55(9): 104-110 https://doi.org/10.13228/j.boyuan.issn0449-749x.20190561

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