The effect of corrosive environment on the crack growth behaviour of nickel based superalloys

腐蚀环境对镍基高温合金裂纹扩展行为的影响

• 批准号: 2611845
• 金额: --
• 依托单位: Swansea University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2611845
• 关键词: effect; corrosive; environment; crack; growth

The operation of nickel-base superalloys in gas turbine engines exposes the components to a broad range of conditions ranging across temperature, stress, time and environment. Furthermore, the gaseous environment, in combination with the high temperatures of operation, can lead to the formation of corrosive species, which can attack the component and lead to degradation during service. One key aspect of component material behaviour is the understanding of the propagation rates of fatigue cracks in the material, which is conventionally conducted in air. However, the impact of corrosive species on crack propagation rates is far less well understood. Utilising the specialist testing chambers available at the Institute of Structural Materials, Swansea University, this study will seek to investigate the role of corrosive environments on the crack propagation rates of a modern nickel-base superalloy. The study will seek to understand the effect of different loading waveforms and cycles in order to determine the impact of corrosion damage on fatigue crack propagation rates. Following testing, detailed characterisation of the fracture surfaces and corrosive species formed during testing will be necessary to inform the operative mechanisms and provide insights into the critical aspects of corrosion crack growth behaviour.

镍基高温合金在燃气涡轮机发动机中的运行使部件暴露于温度、应力、时间和环境的广泛条件下。此外，气态环境与高温操作相结合，可导致腐蚀性物质的形成，这可攻击部件并导致在使用期间的降解。部件材料行为的一个关键方面是了解材料中疲劳裂纹的传播速率，这通常在空气中进行。然而，腐蚀性物质对裂纹扩展速率的影响还远没有得到很好的理解。利用斯旺西大学结构材料研究所提供的专业测试室，本研究将寻求研究腐蚀环境对现代镍基高温合金裂纹扩展速率的作用。该研究将试图了解不同加载波形和周期的影响，以确定腐蚀损伤对疲劳裂纹扩展速率的影响。测试后，有必要对测试过程中形成的断裂面和腐蚀性物质进行详细表征，以了解操作机制，并深入了解腐蚀裂纹扩展行为的关键方面。