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Dynamic Recrystallization Behavior of AISI 422 Stainless Steel During Hot Deformation Processes

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Abstract

In this work, hot compression tests were performed to investigate the dynamic recrystallization (DRX) process of a martensitic stainless steel (AISI 422) at temperatures of 950, 1000, 1050, 1100 and 1150 °C and strain rates of 0.01, 0.1 and 1 s−1. The dependency of strain-hardening rate on flow stress was used to estimate the critical stress for the onset of DRX. Accordingly, the critical stress to peak stress ratio was calculated as 0.84. Moreover, the effect of true strain was examined by fitting stress values to an Arrhenius type constitutive equation, and then considering material constants as a function of strain by using a third-order polynomial equation. Finally, two constitutive models were used to investigate the competency of the strain-dependent constitutive equations to predict the flow stress curves of the studied steel. It was concluded that one model offers better precision on the flow stress values after the peak stress, while the other model gives more accurate results before the peak stress.

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Authors and Affiliations

  1. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, P. O. Box 15875-4413, Iran

    R. Mohammadi Ahmadabadi, M. Naderi & J. Aghazadeh Mohandesi

  2. Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica, ETSEIB, Universitat Politécnica de Catalunya, Av. Diagonal 647, 08028, Barcelona, Spain

    Jose Maria Cabrera

Authors
  1. R. Mohammadi Ahmadabadi
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  2. M. Naderi
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  3. J. Aghazadeh Mohandesi
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  4. Jose Maria Cabrera
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Correspondence to M. Naderi.

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Ahmadabadi, R.M., Naderi, M., Mohandesi, J.A. et al. Dynamic Recrystallization Behavior of AISI 422 Stainless Steel During Hot Deformation Processes. J. of Materi Eng and Perform 27, 560–571 (2018). https://doi.org/10.1007/s11665-018-3153-9

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  • DOI: https://doi.org/10.1007/s11665-018-3153-9

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