CONSTITUTIVE EQUATION TO PREDICT THE FLOW STRESS AND THE PROCESSING MAPS OF THE NI55CR45 ALLOY

1 ŁUKASZEK-SOŁEK Aneta
Co-authors:
2 CHYŁA Piotr 2 ŚWIĄTONIOWSKI Andrzej 2 SZOSTAK Janusz
Institutions:
1 AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Av. Mickiewicza 30, 30-059 Krakow, Poland, EU
2 AGH University of Science and Technology, Faculty of Mechanical Engineering and Robotics, Av. Mickiewicza 30, 30-059 Krakow, Poland, EU, pchyla@agh.edu.pl
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
401-407
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
47 views / 13 downloads
Abstract

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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