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INLUENCE OF LOADING CYCLE ASYMMETRY AND LONG-TERM THERMAL EXPOSURE ON FATIGUE CRACK GROWTH RATE IN MARTENSITIC P91 AND P92 STEELS

1 KANDER Ladislav
Co-authors:
2 KANDER Jan 1 DOBIÁŠ Marek 1 JONŠTA Petr
Institutions:
1 MATERIAL AND METALLURGICAL RESEARCH Ltd., Ostrava - Vítkovice, Czech Republic, EU, ladislav.kander@mmvyzkum.cz
2 Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czech Republic, EU
Conference:
30th Anniversary International Conference on Metallurgy and Materials, Brno, Czech Republic, EU, May 26 - 28, 2021
Proceedings:
Proceedings 30th Anniversary International Conference on Metallurgy and Materials
Pages:
366-371
ISBN:
978-80-87294-99-4
ISSN:
2694-9296
DOI:
https://doi.org/10.37904/metal.2021.4127
Published:
15th September 2021
Proceedings of the conference have already been published in Scopus and we are waiting for evaluation and potential indexing in Web of Science.
Metrics:
580 views / 347 downloads
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Abstract

The paper deals with the effect of different loading cycle asymmetry and long-term thermal exposure on fatigue crack growth rate in P91 and P92 steels used primarily for components in USC powerplants. Testing was performed using C(T) specimens. Fatigue crack growth was measured in II. stage of crack growth described by Paris law from both sides using optical microscope. Loading cycle asymmetry effect was assessed for each steel grade before the thermal exposure and then compared with state after the long-term thermal exposure.

Keywords: Fatigue crack growth rate, loading cycle asymmetry, long-term thermal exposure, P91 and P92 steels

© 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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