Hot Deformation of the Mn-Ni-Cr Alloy During Compression

Sadeghi, M.; Hadi, M.; Bayat, O.; Karimi, H.

doi:10.22068/ijmse.17.1.102

Volume 17, Issue 1 (March 2020) IJMSE 2020, 17(1): 102-108 | Back to browse issues page

‎ 10.22068/ijmse.17.1.102

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Sadeghi M, Hadi M, Bayat O, Karimi H. Hot Deformation of the Mn-Ni-Cr Alloy During Compression. IJMSE 2020; 17 (1) :102-108
URL: http://ijmse.iust.ac.ir/article-1-1471-en.html

Hot Deformation of the Mn-Ni-Cr Alloy During Compression

M. Sadeghi

, M. Hadi

, O. Bayat

, H. Karimi

Abstract: (10996 Views)

In this paper a constitutive equation was considered for the isothermal hot compression test of the Mn-Ni-Cr alloy. The hot compression test was performed in the strain rate range of 0.001-0.1 s^-1 and deformation temperature was varied from 700 to 900 °C. A considerable reduction in flow stress was observed regardless of the strain rate when temperature was increased from 700 to 750 °C. DTA and XRD evaluation revealed that the removal of Mn₃Cr phase and formation of the single solid solution phase were the reason for the flow stress reduction. At the low deformation temperature (700°C) and the high strain rate (0.1 s^-1), a partially recrystallized microstructure was observed; this was such that with increasing the temperature and decreasing the strain rate, a recrystallized microstructure was completed. Also, the relationships between flow stress, strain rate and deformation temperature were addressed by the Zener-Holloman parameter in the exponent type with the hot deformation activation energy of 301.07 KJ/mol. Finally, the constitutive equation was proposed for predicting the flow stress at various strain rates and temperatures.

Keywords: Hot deformation, Constitutive equation, Zener-Holloman, Mn-Ni-Cr alloy