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首页> 外文期刊>Materials Science and Engineering >Effect of microstructural evolution on high-temperature strength of 9Cr-3W-3Co martensitic heat resistant steel under different aging conditions
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Effect of microstructural evolution on high-temperature strength of 9Cr-3W-3Co martensitic heat resistant steel under different aging conditions

机译：不同时效条件下组织演变对9Cr-3W-3Co马氏体耐热钢高温强度的影响

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摘要

Evolution of microstructures and high-temperature strength at 650 ℃ of 9Cr-3W-3Co martensitic heat resistant steel after aging at 650 ℃ and 700 ℃ for different time durations have been experimentally investigated using field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), field emission transmission electron microscopy (FETEM) and post-aged tensile tests. The results show that after aging at 650 ℃, the high-temperature strength and the microstructures of 9Cr-3W-3Co steel keep almost stable with increasing aging time from 300 h to 3000 h. In comparison, after aging at 700 ℃, there are obvious changes in the high-temperature strength and the microstructures. The strengthening mechanisms of the 9Cr-3W-3Co steel were also discussed and the athermal yield stresses were calculated. The change of the high-temperature strength is mainly affected by the evolution of dislocations and laths. The precipitates mainly act as obstacles against motion of dislocations and lath boundaries.
机译：利用场发射扫描电子显微镜（FESEM），X射线等实验研究了9Cr-3W-3Co马氏体耐热钢在650℃和700℃下时效后，在650℃下的显微组织和高温强度的演变。衍射（XRD），场发射透射电子显微镜（FETEM）和老化后的拉伸试验。结果表明，在650℃时效后，随着时效时间从300 h增加到3000 h，9Cr-3W-3Co钢的高温强度和组织几乎保持稳定。相比之下，在700℃时效后，高温强度和微观结构发生明显变化。讨论了9Cr-3W-3Co钢的强化机理，并计算了无热屈服应力。高温强度的变化主要受位错和板条演变的影响。析出物主要充当位错和板条边界运动的障碍。

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  • 来源
    《Materials Science and Engineering》 |2013年第20期|22-28|共7页
  • 作者

    Peng Yan; Zhengdong Liu; Hansheng Bao; Yuqing Weng; Wei Liu;

  • 作者单位

    Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Haidian District, Beijing 100084, China,Institute for Special Steels, China Iron and Steel Research Institute, Beijing 100081, China;

    Institute for Special Steels, China Iron and Steel Research Institute, Beijing 100081, China;

    Institute for Special Steels, China Iron and Steel Research Institute, Beijing 100081, China;

    Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Haidian District, Beijing 100084, China;

    Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Haidian District, Beijing 100084, China;

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  • 正文语种 eng
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  • 关键词

    9Cr-3W-3Co martensitic heat resistant; steel; Aging; Microstructural evolution; High-temperature strength; Athermal yield stress;

    机译：9Cr-3W-3Co马氏体耐热;钢;老化;微观结构演变;高温强度;无热屈服应力;

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