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。
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′,βphase 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 ofγ′,βand 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 ofγ′phase and make their morphology tend to be spherical.What is more,martensitic transformation occurs inβphase.As a consequence,high solidification rate finally has an important impact on the comprehensive properties of the alloys.
作者
李叶凡
李冲
余黎明
刘永长
李会军
LI Ye-fan;LI Chong;YU Li-ming;LIU Yong-chang;LI Hui-jun(School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China)
出处
《精密成形工程》
北大核心
2021年第1期19-25,共7页
Journal of Netshape Forming Engineering
基金
国家自然科学基金(51774212)
天津市自然科学基金(20JCYBJC00950)。
关键词
Ni/Ni3Al基高温合金
凝固速度
凝固组织
相变
Ni/Ni3Al-based superalloy
solidification rate
solidification structure
phase transformation
