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THE STRUCTURAL CHANGES IN STEEL USING IN POWER INDUSTRY AFTER LONG-TERM OPERATED

1 GWOŹDZIK Monika
Institution:
1 Czestochowa University of Technology, Faculty of Production Engineering and Materials Technology, Institute of Materials Engineering, Czestochowa, Poland, EU, gwozdzik.monika@wip.pcz.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:
668-673
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
DOI:
https://doi.org/10.37904/metal.2019.831
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
469 views / 313 downloads
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Abstract

The paper contains results of studies on the formation of oxide layers on 13CrMo4-5 steels long-term operated at an elevated temperature. The studied steels were operated at the temperature of 380 °C for 130,000 h (steel 1) and 535 °C for 230,000 h (steel 2). X-ray structural examinations (studying the phase composition and crystallite sizes) were carried out and microscope observations using an optical and scanning microscope were performed. The native material chemical composition was analysed by means of emission spark spectroscopy, while that of oxide layers on a scanning microscope (EDS). The obtained test results showed that the steel exploited at a higher temperature and longer time was significantly degraded.

Keywords: Oxide layer, 13CrMo4-5, structure, crystallite sizes, elevated temperature

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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