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Characterizing high temperature crack growth behaviour under mixed environmental, creep and fatigue conditions

机译：在混合环境，蠕变和疲劳条件下表征高温裂纹扩展行为

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摘要

Components in high temperature plant could undergo failure due to combinations of fatigue, creep or oxidation/corrosion depending on the loading, temperature and environmental conditions. A novel and robust approach for a progressive failure modelling is presented in this paper which for the first time attempts to combine these failure mechanisms as time or cycle dependent processes. In this study, a combined multiaxial inter/transgranular crack growth model at the meso-scale level was proposed to conveniently deal with the various failure scenarios that may exist in plant components. The simulated crack under the combinations of time dependent creep and oxidation mainly propagated along grain boundaries initiating from the notch surface, exhibiting an irregular shapes with crack branching. Whereas under fatigue/oxidation condition, the crack grew in a transgranular manner. Furthermore, the role of creep, fatigue and oxidation on the failure life was dependent on the applied duration period at peak loads. Cracks were prone to nucleate in transgranular and then propagate in intergranular. There existed competitions between creep, fatigue and oxidation damage. Finally, the failure modes due to different damage mechanisms and loading conditions in the cases of creep-fatigue-oxidation were proposed. The calculated failure modes corresponded with those observed in engineering alloys.
机译：取决于负荷，温度和环境条件，高温设备中的组件可能会由于疲劳，蠕变或氧化/腐蚀的组合而发生故障。本文提出了一种新颖且稳健的渐进式故障建模方法，这是首次尝试将这些故障机制组合为与时间或周期相关的过程。在这项研究中，提出了中尺度水平的多轴间/跨晶界裂纹扩展组合模型，以方便地处理工厂组件中可能存在的各种故障情况。随时间变化的蠕变和氧化作用下的模拟裂纹主要沿着从缺口表面开始的晶界传播，呈现出不规则形状的裂纹分支。而在疲劳/氧化条件下，裂纹以经晶方式生长。此外，蠕变，疲劳和氧化对失效寿命的作用取决于在峰值载荷下施加的持续时间。裂纹在晶间易于成核，然后在晶间扩展。在蠕变，疲劳和氧化损伤之间存在竞争。最后，提出了蠕变疲劳氧化作用下不同损伤机理和载荷条件导致的失效模式。计算出的破坏模式与工程合金中观察到的模式一致。

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