Developing high Co-containing Ni-based superalloys with improved oxidation behaviour for future jet-engine applications

开发具有改善氧化行为的高钴镍基高温合金，用于未来喷气发动机应用

• 批准号: 2386298
• 金额: --
• 依托单位: University of Sheffield
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2386298
• 关键词: Developing; Co; containing; Ni; based

Ni-based superalloys are the alloys of choice for high performance, critical components used at the high temperature sections of gas turbines. In order to enable continuous efficiency gains, gas turbine manufacturers seek to push the operating conditions of Ni-based superalloys to ever higher temperatures and stresses. As a result, the environmental resistance of superalloys is increasingly becoming of critical importance as the elevated temperatures of future engines drives the components into harsher operating regimes. Consequently, the focus of future alloy design programs has identified environmental resistance as a key property for optimisation. Previous research has shown that Ni-based superalloys with elevated Co concentrations possess properties capable of achieving the stringent operating requirements of newer generations of jet engines. In particular, the environmental resistance of such alloys, has been shown to outperform current state-of-the-art superalloys. This behaviour has been demonstrated despite reduced Cr and increased Ti concentrations, which have traditionally been markers of poor oxidation behaviour. In close collaboration with Rolls-Royce plc, this project will focus on establishing the mechanisms that govern the oxidation behaviour in these materials and to inform future alloy design strategies for improved environmental resistance. This will be achieved through a comprehensive experimental matrix that will seek to firstly develop an in-house method of material manufacture, followed by oxidation trials and extensive characterisation utilising thermal analysis, microscopy and advanced diffraction techniques at national facilities. The project will also seek to identify the effects of pre-existing oxidation damage on the overall mechanical properties of the alloys. In parallel, thermodynamic and kinetic modelling approaches will be evaluated against experimental data and the models will be further informed and improved to account for alloys with elevated Co-concentrations. Consequently, the data generated through this project will provide Rolls-Royce with invaluable insights into current alloy behaviour and will inform future alloy development programs.

镍基高温合金是燃气涡轮机高温部分使用的高性能关键部件的首选合金。为了实现持续的效率增益，燃气涡轮机制造商寻求将Ni基超合金的操作条件推向更高的温度和应力。因此，随着未来发动机的高温驱动部件进入更苛刻的工作状态，高温合金的耐环境性变得越来越重要。因此，未来合金设计计划的重点已经将耐环境性确定为优化的关键属性。先前的研究表明，具有高Co浓度的Ni基高温合金具有能够实现新一代喷气发动机的严格操作要求的性能。特别是，这种合金的耐环境性已经显示出优于当前最先进的超合金。尽管Cr浓度降低和Ti浓度增加（传统上是氧化性能差的标志），但仍证明了这种行为。该项目将与罗尔斯·罗伊斯公司密切合作，重点建立控制这些材料氧化行为的机制，并为未来的合金设计策略提供信息，以提高耐环境性。这将通过一个全面的实验矩阵来实现，该矩阵将寻求首先开发内部材料制造方法，然后在国家设施中使用热分析，显微镜和先进的衍射技术进行氧化试验和广泛的表征。该项目还将寻求确定预先存在的氧化损伤对合金整体机械性能的影响。与此同时，热力学和动力学建模方法将根据实验数据进行评估，并将进一步了解和改进模型，以考虑Co浓度升高的合金。因此，通过该项目产生的数据将为劳斯莱斯提供对当前合金行为的宝贵见解，并将为未来的合金开发计划提供信息。