期刊
ENGINEERING FRACTURE MECHANICS
卷 185, 期 -, 页码 46-60出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2017.03.006
关键词
Extrusion; Intrusion; Persistent slip marking; Fatigue crack initiation; Stainless steel
类别
资金
- project CEITEC of MEYS [LQ1601]
- GACR [13-23652S, 15-08826S]
- Fulbright Fellowship
- J. William Fulbright Commission in the Czech Republic
- [LM2015069]
- [RVO: 68081723]
The profiles of persistent slip markings produced by uniaxial and biaxial cyclic straining in four different polycrystalline materials with f.c.c. structure were investigated using focused ion beam (FIB) cutting and TEM observation of oriented surface foils. Typical shapes of persistent slip markings are extrusions accompanied by parallel intrusions. In some cases only extrusions were developed and intrusions were produced later in fatigue life. In polycrystalline copper extrusions and intrusions appear on the surface of the grain where persistent slip band characterized by ladder-like dislocation structure egress on the surface. Similar features were observed in fatigued austenitic 316L and Sanicro 25 steels but the extrusion and intrusion shapes were more complicated. Crack-like intrusion shapes produce high stress and strain concentration and primary stage I crack starts to grow from the tip of intrusions. The experimental observations were compared with the predictions of the existing crack initiation models. (C) 2017 Elsevier Ltd. All rights reserved.
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