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首页> 外文期刊>International Journal of Fatigue >Dependence of dynamic strain ageing on strain amplitudes during the low-cycle fatigue of TP347H austenitic stainless steel at 550℃
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Dependence of dynamic strain ageing on strain amplitudes during the low-cycle fatigue of TP347H austenitic stainless steel at 550℃

机译：TP347H奥氏体不锈钢在550℃低周疲劳过程中动态应变时效对应变幅值的影响

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摘要

Low-cycle fatigue (LCF) tests are carried out on TP347H stainless steel at a strain rate of 8 × 10~(-3) s~(-1) with total strain amplitudes (Δε_t/2) of +-0.4% and +-1.0%, at room temperature (RT) and 550 ℃. It is found that the stress responses and dislocation structures under cyclic loading strongly depend on the value of strain amplitude at 550 ℃. Compared with those at the same strain amplitude at RT, the material shows a rapid strain softening, and finally attains a stabilized state at (Δε_t/2) =+-0.4% and 550 ℃, but the one presents an anomalous behavior, i.e., first a rapid hardening to the maximum stress, followed by a reducing softening at (Δε_t/2) = +-1.0% and 550 ℃. More cells resulting from dislocation cross-slip and planar structures due to dynamic strain ageing (DSA) restricting cross-slip develop at low strain amplitude of +-0.4% at the first cycle. However, there are more complicated dislocation structures, such as cells, elongated cells, walls/channels and planar structures at (Δε_t/2)= +-1.0%. The observations of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) exclude the effects of martensitic transformation, creep, oxidation, and precipitations on these stress responses and microstructure evolutions, which result from DSA appearing at 550℃.
机译：在TP347H不锈钢上以8×10〜（-3）s〜（-1）的应变速率进行低周疲劳（LCF）测试，总应变幅度（Δε_t/ 2）为+ -0.4％和+ -1.0％，在室温（RT）和550℃下。结果表明，循环荷载作用下的应力响应和位错结构强烈依赖于550℃的应变幅值。与在室温下具有相同应变幅度的材料相比，该材料显示出快速的应变软化，并最终在（Δε_t/ 2）= +-0.4％和550℃时达到稳定状态，但是这种材料表现出异常行为，即，首先快速硬化至最大应力，然后在（Δε_t/ 2）= + -1.0％和550℃时减少软化。由于动态应变时效（DSA）限制了交叉滑动，由错位交叉滑动和平面结构产生的更多单元在第一个周期以+ -0.4％的低应变幅度发展。然而，存在更复杂的位错结构，例如，（Δε_t/ 2）＝±-1.0％的晶胞，细长晶胞，壁/通道和平面结构。扫描电子显微镜（SEM）和透射电子显微镜（TEM）的观察结果排除了马氏体相变，蠕变，氧化和沉淀对这些应力响应和微观结构演变的影响，这些影响是由于550℃DSA出现的。

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  • 来源
    《International Journal of Fatigue》 |2013年第11期|1-7|共7页
  • 作者

    HongWei Zhou; YiZhu He; Mian Cui; YuWan Cen; JianQing Jiang;

  • 作者单位

    School of Materials Science and Engineering, Jiangsu Key Lab of Advanced Metallic Materials, Southeast University, Nanjing, 211189 Jiangshu, PR China,School of Materials Science and Engineering, Anhui Key Lab of Materials Science and Processing, Anhui University of Technology, Maanshan, 243002 Anhui, PR China;

    School of Materials Science and Engineering, Anhui Key Lab of Materials Science and Processing, Anhui University of Technology, Maanshan, 243002 Anhui, PR China;

    School of Materials Science and Engineering, Anhui Key Lab of Materials Science and Processing, Anhui University of Technology, Maanshan, 243002 Anhui, PR China;

    School of Mechanical Engineering, Anhui University of Technology, Maanshan, 243002 Anhui, PR China;

    School of Materials Science and Engineering, Jiangsu Key Lab of Advanced Metallic Materials, Southeast University, Nanjing, 211189 Jiangshu, PR China;

  • 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

    TP347H austenitic stainless steel; Dynamic strain ageing; Low-cycle fatigue; Cyclic stress response; Dislocation structure;

    机译：TP347H奥氏体不锈钢;动态应变老化;低周疲劳;循环应力响应;位错结构;

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