DEFORMABILITY AND QUANTITATIVE DESCRIPTION OF THE MICROSTRUCTURE OF HOT-DEFORMED IN 718 SUPERALLOY

1 DUCKI Kazimierz
Co-authors:
1 MENDALA Jacek 2 WOJTYNEK Lilianna
Institutions:
1 Silesian University of Technology, Katowice, Poland, EU, kazimierz.ducki@polsl.pl, jacek.mendala@polsl.pl
2 Opole University of Technology, Opole, Poland, EU, l.wojtynek@po.opole.pl
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
385-390
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
29 views / 11 downloads
Abstract

The influence of initial soaking and parameters of hot plastic working on the deformability and microstructure of the IN 718 superalloy have been presented. The research was performed on a torsion plastometer in the range of temperatures of 900 – 1,150 °C, at a strain rates of 0.1 s-1 and 1.0 s-1. Plastic properties of the alloy were characterized by the worked out flow curves and the temperature relationships of flow stress and strain limit. The structural inspections were performed on microsections taken from plastometric samples after so-called “freezing”. The stereological parameters as the recrystallized grain size, inhomogenity and grain shape have been determined. Functional relation between the Zener-Hollomon parameter and the average grain area has been developed and the activation energy for hot working has been estimated.

Keywords: IN 718 superalloy, hot deformation, recrystallization, quantitative metallography, Zener-Hollomon parameter
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