Micromechanical aspects of the effect of temperature and local plastic strain magnitude on the fracture toughness of ferrite steels
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Date
2023-01-18
Authors
Kotrechko, Sergiy
Kozák, Vladislav
Zatsarna, Oleksandra
Zimina, Galina
Stetsenko, Nataliya
Dlouhý, Ivo
0000-0002-7212-8607Advisor
Referee
Mark
Journal Title
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Volume Title
Publisher
Elsevier
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Abstract
The paper shows that the influence of plastic strain and temperature on the rate of crack nuclei (CN) formation is a crucial factor controlling the shape of the temperature dependence of fracture toughness and its scatter limits. Within the framework of the microscopic model described, it is explained that the dependence of the incompatibility of microplastic deformation at grain boundaries or interfaces on the value of plastic strain and temperature is the reason for the effect of these factors on the rate of CN formation. The dependencies of the CN bulk density on temperature and plastic strain are given. In the latter case, a non-monotonic change in CN density is observed. The maximum intensity of CN formation is observed when the critical value of plastic strain is reached. For ferritic structural steels, this strain is about 2%. Using reactor pressure vessel steel and cast manganese steel as examples, it is shown that not taking these effects into account in the local fracture approach leads to considerable errors in the prediction of the temperature dependence of the fracture toughness and its scatter limits.
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Citation
Procedia Structural Integrity. 2023, vol. 43, issue 1, p. 228-233.
https://www.sciencedirect.com/science/article/pii/S2452321622008265
https://www.sciencedirect.com/science/article/pii/S2452321622008265
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Peer-reviewed
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Published version
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Language of document
en
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Date of acceptance
Defence
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
http://creativecommons.org/licenses/by-nc-nd/4.0/