THE CHARACTERISTIC OF DEFORMABILITY OF NI-FE SUPERALLOY DURING HIGH-TEMPERATURE DEFORMATION

1 DUCKI Kazimierz
Co-authors:
1 PŁACHTA Adam 1 MENDALA Jacek 2 WOJTYNEK Lilianna
Institutions:
1 Silesian University of Technology, Katowice, Poland, EU, kazimierz.ducki@polsl.pl, adam.plachta@polsl.pl, jacek.mendala@polsl.pl
2 Opole University of Technology, Opole, Poland, EU, l.wojtynek@po.opole.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:
414-420
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:
25 views / 8 downloads
Abstract

The influence of two variants of initial soaking at 1120 °C / 2 h and 1180 °C / 2 h and parameters of hot plastic working on the deformability of an IN 718 type superalloy have been presented. The hot deformation characteristics of alloy were investigated by hot torsion tests. The tests were executed at constant strain rates of 0.1 s-1 and 1.0 s-1, and testing temperature in the range of 900 °C to 1150 °C. Plastic properties of the alloy were characterized by worked out flow curves and the temperature relationships of maximum flow stress (σpp) and strain limit (εf). The relationship between the maximum flow stress and the Zener-Hollomon parameter (Z) was described by σpp = A · Zn power function. Activation energy for hot working (Q) was assessed for the alloy after two variants of initial soaking, i.e. 1120 °C / 2 h and 1180 °C / 2 h and amounted - respectively - 478 kJ/mol and 628 kJ/mol.

Keywords: IN 718 superalloy, hot deformation, plastic properties, Zener-Holomon parameter, activation energy for hot working
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