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Mechanistic modelling of time-dependent fatigue crack growth in Ni-based superalloys

机译：镍基高温合金时效疲劳裂纹扩展的力学模型

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Advanced Ni-based superalloys for aero-engine disk applications can experience multiple damage mechanisms that include oxidation, creep and stress corrosion in additional to cycle-dependent fatigue crack initiation and growth. Interactions of these various damage mechanisms can lead to the occurrence of frequency, temperature, heat dwell and environmental effects on the fatigue crack growth response and service life of Ni-based superalloys. In this overview paper, the development of a set of generic microstructure-based fatigue crack growth models for treating concurrent time-dependent and cycle-dependent damage mechanisms at the microstructural levels is summarised. Key features of the mechanistic models are highlighted and utilised to assess the variability of time-dependent fatigue crack growth response in the threshold and power-law regimes due to variations in microstructure such as grain size, and gamma' size. This methodology provides a pathway for evaluating microstructural effects on multiple damage modes and extending the service lives of hot-section components.
机译：用于航空发动机磁盘应用的高级镍基高温合金除了循环依赖的疲劳裂纹萌生和扩展外，还可以经受多种损坏机制，包括氧化，蠕变和应力腐蚀。这些各种损伤机理的相互作用会导致频率，温度，热停留时间和环境因素对镍基高温合金的疲劳裂纹扩展响应和使用寿命的影响。在此概述文件中，总结了一组用于在微观结构水平上同时处理时间依赖性和周期依赖性损伤机理的基于微观结构的通用疲劳裂纹扩展模型。机理模型的关键特征被突出显示，并用于评估由于微观结构（例如晶粒尺寸和γ'尺寸）变化而在阈值和幂律条件下随时间变化的疲劳裂纹扩展响应的变化性。这种方法为评估微观结构对多种损伤模式的影响以及延长热截面部件的使用寿命提供了途径。

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