The behavior of short fatigue cracks during Very High Cycle (VHCF) Fatigue of duplex stainless steel

被引：29
|
作者：
Krupp, U. [1 ]
Giertler, A. [1 ]
Soeker, M. [1 ]
Fu, H. [2 ]
Doenges, B. [2 ]
Christ, H. -J. [2 ]
Huesecken, A. [3 ]
Pietsch, U. [3 ]
Fritzen, C. -P. [4 ]
Ludwig, W. [5 ]
机构：
[1] Univ Appl Sci Osnabruck, Fac Engn & Comp Sci, D-49009 Osnabruck, Germany
[2] Univ Siegen, Inst Mat Technol, D-57068 Siegen, Germany
[3] Univ Siegen, Solid State Phys, D-57068 Siegen, Germany
[4] Univ Siegen, Inst Mech & Control, D-57068 Siegen, Germany
[5] European Synchrotron Radiat Facil, F-38043 Grenoble, France
来源：
ENGINEERING FRACTURE MECHANICS | 2015年 / 145卷
关键词：
Duplex steel; VHCF; Short cracks; Modeling; Barrier strength; SLIP IRREVERSIBILITY; GROWTH; PROPAGATION; INITIATION; MODEL; REGIME; LIFE;
D O I：
10.1016/j.engfracmech.2015.03.024
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
During VHCF loading of duplex steels fatigue damage starts within the softer austenite phase. Depending on the spatial mismatch between the slip systems of neighboring grains, intergranular or transgranular fatigue cracks are initiated. If these cracks can propagate or are blocked depends on the interactions with the local microstructure. These interactions have been studied by ultrasonic fatigue testing in combination with electron microscopy and synchrotron diffraction experiments. It was found that the strength of the first microstructural barrier is decisive for VHCF life. The barrier strength as a function of the microstructural arrangement has been implemented in a micromechanical finite element approach that shall be used to predict the VHCF life or the existence of a fatigue limit for given microstructure parameters. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：197 / 209
页数：13
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