Dynamic Deformation Behavior and Its Constitutive Model of  Fe-11Mn- 4Al- 0.2C Medium-Mn Steel

doi:10.12068/j.issn.1005-3026.2021.09.009

Abstract

Abstract: Based on quasi-static and dynamic tensile tests， deformation behaviors of Fe-11Mn-4Al-0.2C medium manganese steel at strain rates of 2×10^-3~200s^-1 were studied， and the corresponding Johnson-Cook(J-C)constitutive model was established. The results show that the strain rate has no effect on the stage of elastic deformation. In the early stage of plastic deformation， the strength of the tested steel increases with increase of the strain rate， while it decreases in the latter stage of plastic deformation. The strain rate sensitivity(SRS)index m of the tested steel changes from 0.013 to-0.018 with increases of the applied strain. The original J-C constitutive model did not fit well with the experimental data and was a relative error of 5.1%. After modifying the enhancement coefficient of strain rate， the revised J-C model is proposed with a better fitting and smaller relative error about 1.6%.

Key words: medium-Mn steel; strain rate; plastic deformation; strain hardening; J-C constitutive model

CLC Number:

TP20

CAI Zhi-hui， ZHANG De-liang， WEN Guang-qi， ZHOU Yan-jun. Dynamic Deformation Behavior and Its Constitutive Model of Fe-11Mn- 4Al- 0.2C Medium-Mn Steel[J]. Journal of Northeastern University(Natural Science), 2021, 42(9): 1275-1281.

References

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Dynamic Deformation Behavior and Its Constitutive Model of Fe-11Mn- 4Al- 0.2C Medium-Mn Steel

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