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首页> 外文期刊>Materials Science and Engineering >Investigation on microstructure evolution and fracture morphology of single crystal nickel-base superalloys under creep-fatigue interaction loading
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Investigation on microstructure evolution and fracture morphology of single crystal nickel-base superalloys under creep-fatigue interaction loading

机译：蠕变疲劳作用下单晶镍基高温合金的组织演变和断裂形态研究

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摘要

Creep-fatigue interaction behavior of a single crystal nickel-base superalloy was studied at 980 ℃ and the microstructure was quantitatively analyzed. A three-stepped plate specimen had been designed to simultaneously observe microstructure changed under three different stresses. It was found that the distribution of y' size was basically consistent with lognormal probability scale under all three loading conditions. The average size of γ' precipitates increased with the increasing of stress at the same interrupted time. Four different layers including oxide layer, γ'-free layer, γ'-reduced layer and γ/γ' layer can be observed on the cross-section of the specimens. The thickness of γ'-free layer also increased with the increasing of stress. Numerous dimples and square-shaped facets were observed at the fracture surface and furthermore propagation of cracks from micropores to the boundary of the facets could be found, which showed the fracture behaviours of both creep and fatigue damage.
机译：研究了单晶镍基高温合金在980℃下的蠕变疲劳行为，并对组织进行了定量分析。设计了一个三步板试样，以同时观察在三种不同应力下的微观结构变化。发现在所有三种载荷条件下，y′的大小分布与对数正态概率尺度基本一致。在相同的中断时间，γ'析出物的平均尺寸随应力的增加而增加。在样品的横截面上可以观察到四个不同的层，包括氧化物层，无γ′层，γ′还原层和γ/γ′层。无γ'层的厚度也随着应力的增加而增加。在断裂面上观察到许多凹坑和方形刻面，并且还发现了裂纹从微孔到刻面边界的传播，这表明了蠕变和疲劳损伤的断裂行为。

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  • 来源
    《Materials Science and Engineering》 |2017年第14期|126-131|共6页
  • 作者

    Z.Y. Yu; X.Z. Wang; Z.F. Yue; X.M. Wang;

  • 作者单位

    School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China;

    School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China;

    School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China;

    School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Nickel-base single crystal superalloy; Creep-fatigue interaction; Microstructure; Fracture morphology;

    机译：镍基单晶高温合金;蠕变疲劳相互作用;微观结构断裂形态;

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