The hot deformation behaviour of Ni55Cr45 alloy was investigated by isothermal compression test on the GLEEBLE 3800 thermo-mechanical simulator in the wide range of temperatures (750 – 1150 °C ) and strain rates (1 – 100 s-1). The experimental stress-strain data were employed to develop the constitutive equation and activation energy of the investigated Ni-Cr alloy. The correlation between the flow stress, temperature and strain rate at high temperatures was expressed by an Arrhenius type equation. The effects of temperature and strain rate on deformation behaviour were represented by Zener-Hollomon parameter in an exponent-type equation. Activation energy was calculated using a sine-hyperbolic type equation. The processing maps based on the Murty’s approach were developed. The processing window and the flow instability areas were determined. Furthermore the experimental rolling test was conducted according to delineated processing parameters. The results of numerical simulation and experimental rolling test showed good agreement with the optimum hot deformation condition.Keywords: constitutive analysis, flow stress, activation energy, processing map
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