期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 103, 期 -, 页码 309-317出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2017.06.011
关键词
SMAT; Nanocrystalline materials; Low cycle fatigue; Material characterization; Stainless steel
资金
- Champagne-Ardenne Research Council
- European FEDER program through NANO SURF project
- European FEDER program through NANOTRIBO project
- University of Technology of Troyes
- Grand Troyes
- Conseil Departemental de l'Aube
- MESR
In order to study the influence of surface mechanical attrition treatment (SMAT) on low cycle fatigue (LCF) properties of an austenitic stainless steel AISI 3161, cyclic loading responses and fatigue lifetime are investigated using fully reversed tension-compression LCF tests under total strain control. The results reveal that SMATed material exhibits higher cyclic stress amplitude due to higher strength of the SMAT affected region. During cyclic loading, untreated material is hardened under high strain amplitude (+/- 0.8%, +/- 1.25%), but softened under low strain amplitude (+/- 0.5%). In contrast, SMAT affected region undergoes cyclic softening. Furthermore, SMAT mainly affects cyclic behavior of the early stage of LCF, and its effect is gradually reduced as cyclic loading goes on. Fatigue lifetime analysis indicates that SMAT could decrease the fatigue lifetime of material under cyclic loading with high strain amplitude ( 1.25%). Based on analysis using Coffin-Manson law and energy dissipation theory, this lifetime decrease is considered to be due to the decrease of ductility and fatigue damage capacity. (C) 2017 Elsevier Ltd. All rights reserved.
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