【摘要】 Ni/Ni₃Al基高温合金因其优异的高温强度、抗氧化性能和抗蠕变能力等优点,被广泛应用于航空航天等领域。简要介绍了凝固速度对Ni/Ni₃Al基高温合金中γ′,β相以及碳化物等析出相的组织演变及相变行为的影响,为Ni/Ni₃Al基高温合金非平衡凝固的研究开发及组织调控提供借鉴和指导。Ni/Ni₃Al基高温合金中γ′,β相以及碳化物等析出相对凝固过程中的冷却速度十分敏感。在高凝固速度下,这些析出相会呈现与低冷却速度凝固截然不同的组织特征,高凝固速度会使合金中γ′尺寸显著减小,形貌倾向于球形,β相发生马氏体相变等,并最终对合金的综合性能产生重要影响。更多还原

【Abstract】 Ni/Ni₃Al-based superalloys are widely used in aerospace and other fields because of their excellent high temperature strength, oxidation resistance and creep resistance. In the work, the effect of solidification rate on the microstructure evolution and phase transformation behavior（γ′, β phase and carbide precipitates） in Ni/Ni₃Al-based superalloys were reviewed. It provides reference and guidance for the research and microstructure control of non-equilibrium solidification technology for Ni/Ni₃Al-based superalloys. The precipitates of γ′, β and carbides in Ni/Ni₃Al-based superalloys are very sensitive to the cooling rate during solidification. At high solidification rate, these precipitates present different microstructure characteristics from low solidification rate. High solidification rate can significantly reduce the size of γ′ phase and make their morphology tend to be spherical. What is more, martensitic transformation occurs in β phase. As a consequence, high solidification rate finally has an important impact on the comprehensive properties of the alloys.更多还原