Microstructural Stability and Properties of New Nickel-Base Superalloys with Varying Aluminium: Niobium Ratio
Microstructural Stability and Properties of New Nickel-Base Superalloys with Varying Aluminium: Niobium Ratio
复制标题
不同铝铌比的新型镍基高温合金的微观结构稳定性和性能
DOI：
10.1002/adem.202201669
复制
发表时间：
2023
影响因子：
3.6
通讯作者：
Wise G
中科院分区：
文献类型：
--
作者：
Wise G
未来更高效的燃气涡轮机发动机需要具有更高温度能力的新型镍基高温合金。在设计这种合金时，需要仔细考虑元素浓度，以确保获得适当的性能平衡。本文通过在700 °C下长期热暴露来评估具有不同Al：Nb比的新型镍基高温合金的相平衡和显微组织稳定性。使用扫描和透射电子显微镜、X射线衍射、差示扫描量热法和维氏硬度测试对合金进行分析，并通过基于强对和弱对位错耦合机制的机械性能预测对结果进行合理化。该合金显示出比Inconel 718具有更高的热稳定性，并且在热暴露后表现出明显的硬化效果。在此，他们的能力，控制时效硬化和潜在的易于处理的突出结果。
New nickel‐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 a suitable balance of properties is obtained. Herein, the phase equilibria and microstructural stability of new nickel‐base superalloys with varying Al:Nb ratio are assessed via long‐term thermal exposures at 700 °C. The alloys are analyzed using scanning and transmission electron microscopy, X‐ray diffraction, differential scanning calorimetry, and Vickers hardness testing, with the results rationalized through mechanical property predictions based on strong‐ and weak‐pair dislocation coupling mechanisms. The alloys are shown to have greater thermal stability than Inconel 718 and exhibit a pronounced hardening effect after thermal exposure. Herein, their ability for controlled age hardening and potential ease of processing is highlighted in the results.