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首页> 外文期刊>International Journal of Fatigue >Short fatigue crack propagation during low-cycle, high cycle and very-high-cycle fatigue of duplex steel - An unified approach
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Short fatigue crack propagation during low-cycle, high cycle and very-high-cycle fatigue of duplex steel - An unified approach

机译：双相钢在低周，高周和极高周疲劳中的短时疲劳裂纹扩展-统一方法

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摘要

The present paper reviews experimental results on the fatigue damage of austenitic-ferritic duplex steel under various load levels ranging from LCF to VHCF, placing the focus towards the relationship between the crystallographic orientation of individual grains and grain patches that exhibit slip band formation, fatigue crack initiation and growth. A combination between fatigue testing of electropolished specimens and analytical electron microscopy (SEM/EBSD, TEM) revealed that under LCF loading conditions almost all the ferrite and the austenite grains showed plasticity, while under HCF and VHCF loading conditions, slip band formation was limited to the softer austenite grains and a low plastic activity is observed in the ferrite. Once being formed, the bands generate high stress concentrations, where they impinge the α-γ phase boundaries, eventually, leading to the crack initiation. This is discussed by applying a numerical simulation approach based on the finite-element (FEM) and the boundary-element (BEM) method.
机译：本文综述了在从LCF到VHCF的各种载荷水平下奥氏体-铁素体双相钢的疲劳损伤的实验结果，重点研究了单个晶粒的晶体取向与表现出滑移带形成，疲劳裂纹的晶粒斑之间的关系。萌芽和成长。电抛光样品的疲劳测试与分析电子显微镜（SEM / EBSD，TEM）的结合显示，在LCF加载条件下，几乎所有铁素体和奥氏体晶粒都显示出可塑性，而在HCF和VHCF加载条件下，滑移带形成受到限制在铁素体中观察到较软的奥氏体晶粒且塑性较低。一旦形成，这些带会产生高应力集中，并撞击α-γ相界，最终导致裂纹萌生。通过应用基于有限元（FEM）和边界元（BEM）方法的数值模拟方法对此进行了讨论。

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  • 来源
    《International Journal of Fatigue》 |2014年第8期|78-85|共8页
  • 作者

    Ulrich Krupp; Iris Alvarez-Armas;

  • 作者单位

    Faculty of Engineering and Computer Science, University of Applied Sciences, 49009 Osnabrueck, Germany;

    Instituto de Fisica Rosario - CONICET, Universidad National de Rosario, Bv. 27 de Febrero 210bis, 2000 Rosario, Argentina;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Duplex steel; Short fatigue cracks; LCF; VHCF; Modeling;

    机译：双相钢疲劳裂纹短;LCF;VHCF;造型;

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