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首页> 外文期刊>Materials Science and Engineering >Mechanical response and dislocation substructure of a cast austenitic steel under low cycle fatigue at elevated temperatures
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Mechanical response and dislocation substructure of a cast austenitic steel under low cycle fatigue at elevated temperatures

机译：高温低循环疲劳下铸造奥氏体钢的力学响应和位错亚结构

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摘要

With the increase of exhaust temperature in automobiles resulting from the stricter environmental and fuel consumption regulations, high temperature fatigue failure of exhaust manifolds is being a significant issue for safety concern. In this research, low cycle fatigue behavior of a Nb-bearing cast austenitic steel with the "Chinese-script" type primary Nb(C,N), was investigated in the temperature range of 600-950 ℃. It is indicated that the fatigue lifetime was predominantly dependent on the inelastic strain amplitude, in spite of fatigue temperature. However, the change of deformation substructure from dislocation cells, slip bands to subgrains was observed from 600 ℃ to 950 ℃, which was induced by the increased thermal recovery. Correspondingly, the cyclic stress amplitude changed from cyclic hardening at 600 "C to cyclic softening and cyclic stress saturation at 800 ℃ and 950 ℃, respectively. Besides, strain heterogeneity was also noted between the dendrite core and the interdendritic region, thus regarded as a promotion for crack initiation. The generated data and the understanding will be helpful for alloy design and fatigue lifetime prediction next.
机译：随着更严格的环境和燃料消耗法规导致的汽车排气温度的升高，排气歧管的高温疲劳失效正成为安全性关注的重要问题。在这项研究中，研究了Nb（C，N）型“中文”型含Nb的奥氏体铸钢在600-950℃的温度范围内的低周疲劳行为。结果表明，尽管疲劳温度升高，疲劳寿命仍主要取决于非弹性应变幅度。然而，从600℃到950℃观察到了从位错单元，滑移带到亚晶粒的变形亚结构的变化，这是由热回收的增加引起的。相应地，循环应力振幅从600“ C的循环硬化转变为800℃和950℃的循环软化和循环应力饱和。此外，在枝晶核心和枝晶间区域之间还观察到应变异质性，因此可以认为是促进裂纹萌生，生成的数据和理解将有助于下一步的合金设计和疲劳寿命预测。

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  • 来源
    《Materials Science and Engineering》 |2017年第4期|422-429|共8页
  • 作者

    Hailong Zhao; Carlos C. Engler-Pinto Jr; Jinyan Tong; Larry A. Godlewski; Jacob W. Zindel; Longfei Li; Mei Li; Qiang Feng;

  • 作者单位

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China ,Ford Research and Advanced Engineering Laboratory, Dearborn, MI 48124, USA;

    Ford Research and Advanced Engineering Laboratory, Dearborn, MI 48124, USA;

    AECC Commercial Aircraft Engine Co., Ltd, Shanghai 200241, China;

    Ford Research and Advanced Engineering Laboratory, Dearborn, MI 48124, USA;

    Ford Research and Advanced Engineering Laboratory, Dearborn, MI 48124, USA;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;

    Ford Research and Advanced Engineering Laboratory, Dearborn, MI 48124, USA;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Deformation structure; Low cycle fatigue; Recovery; Dislocation cells; Cast austenitic steel;

    机译：变形结构;低周疲劳;复苏;脱位细胞;铸造奥氏体钢;

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