Oxidation Behaviour of New Nickel-Base Superalloys with Varying Aluminium: Niobium Ratio-猫眼课题宝

不同铝铌比的新型镍基高温合金的氧化行为

DOI：

10.1007/s11085-023-10146-6

发表时间：

2023

期刊：

High Temperature Corrosion of Materials

影响因子：

通讯作者：

中科院分区：

文献类型：

作者：

Wise G

未来更高效的燃气轮机发动机需要具有更高温度性能的新型镍基高温合金。在设计这类合金时，需要仔细考虑元素浓度，以确保在机械性能和耐环境性能之间取得适当的平衡。在本研究中，通过长期暴露在高温空气中，评估了一系列不同Al：Nb比的新型镍基高温合金的抗氧化性。用扫描电子显微镜、能量色散X射线能谱、X射线衍射和氧化膜尺寸的定量测量对氧化膜进行了表征。发现这些合金在700℃时形成了连续的铬垢，性能优于目前几种商业高温合金。然而，在800℃暴露后，由于δ相的析出，观察到显著的组织退化。

New Ni-base superalloys with higher temperature capability are required for future, more efficient gas turbine engines. In designing such alloys, careful consideration is required of the elemental concentrations to ensure that a suitable balance of mechanical properties and environmental resistance is obtained. In this study, the oxidation resistance of a series of new Ni-base superalloys with varying Al:Nb ratio has been assessed through long-term exposures in air at elevated temperature. The oxide scale was characterised using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction and quantitative measurements of oxide scale dimensions. The alloys were found to form continuous chromia scales at 700 °C and outperformed several current commercial superalloys. However, following exposure at 800 °C, significant microstructural degradation was observed due to precipitation of theδphase.Graphical Abstract