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A critical assessment of fatigue crack nucleation and growth models for Ni- and Ni,Fe-based superalloys

机译：Ni和Ni，Fe基高温合金疲劳裂纹成核和生长模型的关键评估

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Ni- and Ni,Fe-based superalloys are used extensively in the hot sections of gas turbines in the aerospace and power generation industries. One way to improve the performance of turbines is through increased operating temperatures and stresses. Therefore, an understanding of the factors that influence resistance of these materials to creep and fatigue is necessary to build models that can predict the lives of components in these harsh operating conditions. Predicting crack nucleation (or formation) and the subsequent rate of crack propagation is a complex problem because of the interactions between microstructure, cyclic deformation, and the high temperature effects of creep and environment; an additional influence is variable amplitude loading during the service life. This paper will discuss the pertinent research over the past three decades that has considered microstructural, temperature, environmental, frequency and loading effects on fatigue crack growth in these important intermediate temperature alloys and is divided into sections devoted to crack nucleation, short crack growth, and long crack growth.
机译：镍和镍，铁基超级合金广泛用于航空航天和发电行业中燃气轮机的高温区域。改善涡轮机性能的一种方法是提高运行温度和应力。因此，必须了解影响这些材料的耐蠕变性和疲劳性的因素，以建立可预测这些恶劣工作条件下组件寿命的模型。由于微观结构，周期性变形以及蠕变和环境的高温影响之间的相互作用，预测裂纹的成核（或形成）和随后的裂纹扩展速率是一个复杂的问题。另一个影响是使用寿命期间的可变振幅负载。本文将讨论在过去的三十年中的相关研究，这些研究考虑了这些重要的中温合金的显微组织，温度，环境，频率和载荷对疲劳裂纹扩展的影响，并分为几个部分，分别讨论了裂纹成核，短裂纹增长和长裂纹增长。

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