Critical Assessment 21: Oxygen-assisted fatigue crack propagation in turbine disc superalloys
Critical Assessment 21: Oxygen-assisted fatigue crack propagation in turbine disc superalloys
复制标题
DOI：
10.1080/02670836.2016.1148227
复制
发表时间：
2016-03
影响因子：
1.8
通讯作者：
Rong Jiang;Philippa Reed
中科院分区：
文献类型：
--
作者：
Rong Jiang;Philippa Reed
由于涡轮机入口温度升高，涡轮盘应用中的镍基高温合金对氧辅助疲劳裂纹扩展的敏感性越来越高。对氧辅助疲劳裂纹扩展过程中各因素之间相互作用的持续缺乏了解限制了：(1) 开发寿命方法以准确预测盘合金/部件的疲劳性能，以及 (2) 相关盘合金的开发。更好地理解氧的作用的一个基础要求是表征裂纹尖端局部应力/应变状态下的氧扩散过程，这与微观结构特征密切相关。需要建立三维裂纹断层扫描、裂纹扩展速率和与氧相关的攻击之间的联系。包括疲劳-蠕变-氧攻击之间相互作用的定量模型需要进一步开发。
Ni-based superalloys in turbine disc applications face increasing susceptibility to oxygen-assisted fatigue crack propagation due to increased turbine entry temperatures. The continued lack of understanding of the interplay between the factors operating during oxygen-assisted fatigue crack propagation limits: (1) development of lifing methodologies to accurately predict the fatigue performance of disc alloys/components and (2) associated disc alloy developments. An underpinning requirement to better understand the role of oxygen is to characterise the process of oxygen diffusion in the localised stress/strain state at the crack tip, which is related closely to microstructural features. The link between three-dimensional crack tomography, crack propagation rate and oxygen-related attack needs to be established. Quantitative models which include the interaction between fatigue–creep–oxygen attack need further development.