Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 517, Issue 1-2, Pages 204-211Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.03.070
Keywords
Fatigue crack initiation; Extrusion; Intrusion; Stainless steel; Focused ion beam (FIB)
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Funding
- Academy of Sciences of the Czech Republic [AVOZ 20410507]
- Grant Agency of the Czech Republic [106/06/1096, 101/07/1500]
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Scanning electron microscopy (SEM) combined with local milling by focused ion beam (FIB) was used to study the true shape of the relief developed on the surface of polycrystalline 316L steel cycled with constant plastic strain amplitude. Localization of the cyclic strain to persistent slip bands results in early formation of persistent slip markings. The evolution of the early relief formation is reported using the observation on two perpendicular surfaces. The observed configurations of extrusions and intrusions are discussed and compared with predictions of the latest models of fatigue crack initiation. The prominent role of intrusions in fatigue crack initiation is emphasized. (C) 2009 Elsevier B.V. All rights reserved.
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