【摘要】 Inconel 718/GH4169高温合金广泛应用于航空、航天、石油、化工和核能等领域。其优异的力学性能包括强度、韧性和高温抗蠕变性与合金热处理工艺中显微结构的演变密切相关。厘清时效工艺和显微结构以及力学性能间的关联关系可为工业界提供优化时效工艺的科学依据。本文研究了该合金不同时效工艺后显微结构和力学性能的变化，揭示了时效温度和时长对析出相尺寸、数量和合金力学性能的影响，明确了Inconel 718/GH4169合金工业应用中热处理工艺的优化方向。更多还原

【Abstract】 Inconel 718/GH4169 superalloys are widely used in aviation, aerospace, petrochemical and energy industries because their excellent mechanical properties, such as high strength, toughness, and creep resistance up to a temperature of 650℃. The microstructure and mechanical properties of the alloy are determined by heat treatment processing, especially the aging treatment. Based on advanced microscopies, microstructures and mechanical properties of Inconel 718 alloy after different aging treatments have been systemically investigated to reveal their relationship, which might provide guidelines to optimize the aging treatment processing for industries. Results show that aging temperature and time greatly affect the precipitation behavior, and determine mechanical properties of the alloy. Besides, the optimization of the heat treatment processing for industrial application has been also briefly discussed.更多还原