Influence of severe plastic deformation and specimen orientation on the fatigue crack propagation behavior of a pearlitic steel

Fatigue crack propagation (FCG) experiments performed on a fully pearlitic steel subjected to severe plastic deformation are presented. The steel was deformed by high-pressure torsion to study the influence of applied strain and specimen orientation on the FCG-behavior. With increasing strain the la...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2018-01, Vol.710, p.260-270
Main Authors: Leitner, T., Trummer, G., Pippan, R., Hohenwarter, A.
Format: Article
Language:English
Subjects:
Anisotropy
Crack propagation
Deformation
Deformation mechanisms
Fatigue crack propagation
Fatigue failure
Fracture mechanics
Fracture toughness
Lamella
Lamellar structure
Orientation
Pearlitic steels
Plastic deformation
Severe plastic deformation
Shielding
Steel structures
Strain
Stress intensity factors
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Summary:Fatigue crack propagation (FCG) experiments performed on a fully pearlitic steel subjected to severe plastic deformation are presented. The steel was deformed by high-pressure torsion to study the influence of applied strain and specimen orientation on the FCG-behavior. With increasing strain the lamellar structure of the steel is aligned parallel to the shear plane of the HPT-sample and the lamella spacing is markedly reduced. These microstructural changes exhibit a significant influence on the FCG-behavior. The threshold of stress intensity factor range decreases, while at the same time the fatigue crack propagation rate rises with increasing level of pre-deformation. In addition a pronounced anisotropy in the crack propagation behavior depending on the specimen orientation evolves. The observed trends will be explained on the basis of the fading influence of shielding mechanisms and the microstructural alignment of the structure upon deformation.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.10.040