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Constitutive equations were used to derive the flow stress of a 17–4 PH stainless steel during hot compression testing. Two general
methods were used: (i) a conventional method of finding apparent materials constants; and (ii) a physically based approach which
accounts for the dependence of the Young’s modulus and the self-diffusion coefficient of austenite on temperature. Both methods were
critically discussed and some modifications and easy-to-apply methods were also introduced. The second approach was also performed
for peak and critical stresses to find out the effect of dynamic recrystallization on the ideal theoretical values. The discussion of results
proved that when the deformation mechanism is controlled by the glide and climb of dislocations, a constant creep exponent (n) of 5 can
be used in the classical hyperbolic sine equation, and the self-diffusion activation energy can be used to describe the appropriate stress.
2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
CitacióMirzadeh, H.; Cabrera, J.; Najafizadeh, A. Constitutive relationships for hot deformation of austenite. "Acta materialia", Setembre 2011, vol. 59, núm. 16, p. 6441-6448.