INFLUENCE OF AUSTENITIZING TEMPERATURE ON MICROSTRUCTURE AND KINETICS GROWTH OF AUSTENITE GRAIN IN 9 CRNB STEEL

1,2 PARILÁK Ľudovít
Co-authors:
1 BEKEČ Pavel 1,2 BERAXA Pavol
Institutions:
1 ŽP Research and Development Centre, Ltd., Kolkáreň 35, 97681 Podbrezová, Slovakia, *bekec@zelpo.sk
2 Faculty of Manufacturing Technologies with a Seat in Prešov, Bayerova 1, 08001 Prešov, Slovakia
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:
968-972
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:
102 views / 30 downloads
Abstract

This paper deals with the influence of various austenitizing temperatures on microstructure and kinetics growth of austenite grain in 9 CrNB steel. High austenitizing temperatures (1070 °C, 1150 °C, 1170 °C, 1190 °C, 1210 °C and 1230 °C) with a holding time 120 min were used. The microstructure was formed by martensite after austenitization. The occurrence of delta ferrite was observed in microstructure at temperature higher than 1190 °C. Delta ferrite was located at the grain boundaries and its amount was about 3 % at the austenitization temperatures of 1190 °C and 1210 °C and up to 5.5 % at the temperature of 1230 °C. In terms of the kinetics of austenite grain growth, it can be concluded, that up to temperature of 1170 °C there is an increase in grain size. At the higher austenitization temperature (over 1190 °C) we observed the decrease of grain size.

Keywords: Austenitizing temperature, heat treatment, delta ferrite, grain growth, low carbon 9Cr steel

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