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首页> 外文期刊>Materials Science and Engineering >Creep-fatigue behavior of turbine disc of superalloy GH720Li at 650 ℃ and probabilistic creep-fatigue modeling
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Creep-fatigue behavior of turbine disc of superalloy GH720Li at 650 ℃ and probabilistic creep-fatigue modeling

机译：650℃高温合金GH720Li涡轮盘蠕变疲劳行为及概率蠕变疲劳建模。

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摘要

Creep-fatigue experiments have been conducted in nickel-based superalloy GH720Li at an elevated temperature of 650 ℃ with a stress ratio of 0.1, based on which, different dwell times at the maximum loading were applied to investigate the effect of dwell time on the creep-fatigue behaviors. The tested specimens were cut from the rim region of an actual turbine disc in the hoop direction. The grain size and precipitates of the GH720Li superalloy were examined through scanning electronic microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) analyses. Experimental data shows creep-fatigue lifetime decreases as the dwell time prolongs. Further, different scattering was observed in the creep-fatigue lifetime at different dwell times. Then a probabilistic model based on the applied mechanical work density (AMWD), with a linear heteroscedastic function that evaluates the non-constant deviation in the creep-fatigue lifetime, was formulated to describe the dependence of creep-fatigue lifetime on the dwell time. Finally, the possible microscopic mechanism of the creep-fatigue behavior has been discussed by SEM with EDS on the fracture surfaces.
机译：在镍基高温合金GH720Li上，在温度为650℃，应力比为0.1的条件下进行了蠕变疲劳试验，在此基础上，采用了最大载荷下的不同停留时间，以研究停留时间对蠕变的影响。疲劳行为。从实际涡轮盘的边缘区域沿环向切下测试样本。通过扫描电子显微镜（SEM）和能量色散X射线光谱（EDS）分析检查了GH720Li高温合金的晶粒尺寸和析出物。实验数据表明，随着停留时间的延长，蠕变疲劳寿命降低。此外，在不同的停留时间下，蠕变疲劳寿命中观察到了不同的散射。然后，基于所应用的机械功密度（AMWD），并具有线性异方差函数的概率模型，该模型评估了蠕变疲劳寿命的非恒定偏差，从而描述了蠕变疲劳寿命对停留时间的依赖性。最后，通过SEM和EDS在断裂面上讨论了蠕变疲劳行为的可能的微观机理。

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  • 来源
    《Materials Science and Engineering》 |2016年第18期|17-25|共9页
  • 作者

    Dianyin Hu; Qihang Ma; Lihong Shang; Ye Gao; Rongqiao Wang;

  • 作者单位

    School of Energy and Power Engineering, Beihang University, Beijing 100191, China,Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China,Beijing Key Laboratory of Aero-Engine Structure and Strength, Beijing 100191, China;

    School of Energy and Power Engineering, Beihang University, Beijing 100191, China;

    Mining and Materials Engineering, McGill University, Montreal, QC H3A 0C5, Canada;

    School of Energy and Power Engineering, Beihang University, Beijing 100191, China;

    School of Energy and Power Engineering, Beihang University, Beijing 100191, China,Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China,Beijing Key Laboratory of Aero-Engine Structure and Strength, Beijing 100191, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Creep-fatigue; Probabilistic model; Mechanical characterization; CH720Li superalloy;

    机译：蠕变疲劳;概率模型机械特性CH720Li超级合金;

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