Abstract: In this paper， the main research object is the deformed superalloys that have passed the national acceptance， identification or batch production， which are included in the China Superalloy Manual （2012 edition），through a large number of literature research， the role of Nb in deformed superalloys is summarized. The results show that Nb is not only the main solution strengthening element， but also the main precipitation strengthening element in superalloys. In the solution strengthened superalloy， NbC and Z-（Ni_0.04Cr_0.83Fe_0.13）1.9（W_0.15Mo_0.09Nb_0.76）_3.3 N are mainly Nb formed， which can significantly improve the creep strength of the alloy， reduce the creep rate， and ensure the good welding process performance of the alloy； In precipitation strengthened superalloys γ′- Ni₃（Al，Ti）、γ″-Ni₃ Nb、δ-Ni₃ Nb、ε- Ni₃（Nb，Ti） and Laves-（FeCoNi）_1.84（NbTiSi） etc are mainly Nb formed， and good comprehensive properties can be obtained by controlling the changes of the size， morphology and distribution of the precipitated phase. At present， nearly 30% of deformed superalloys are strengthened by Nb， and the development of modern superalloy materials has been inseparable from the participation of Nb.

Key words: Nb, Wrought Superalloy, Solid Solution Strengthened Superalloy, Precipitation Strengthened Superalloy

摘要： 以载入《中国高温合金手册（2012年版）》的经过国家验收、鉴定或批量生产的变形高温合金为主要研究对象，通过大量的文献调研，总结了Nb在变形高温合金中的作用。总结表明，在高温合金中，Nb既是主要的固溶强化元素，又是主要的沉淀强化元素。在固溶强化型高温合金中，Nb主要形成NbC、Z-（Ni_0.04Cr_0.83Fe_0.13）_1.9（W_0.15Mo_0.09 Nb_0.76）_3.3 N等相，显著提高合金的蠕变强度，降低蠕变速率，同时能保证合金良好的焊接工艺性能；在沉淀强化型高温合金中，主要形成γ′-Ni₃（Al，Ti）相、γ″-Ni₃ Nb相、δ-Ni₃ Nb相、ε-Ni₃（Nb，Ti）相、Laves-（FeCoNi）_1.84（NbTiSi）相等，通过控制析出相尺寸、形貌和分布的变化来获得良好的综合性能。目前有接近30%的变形高温合金均采用Nb元素进行强化，现代高温合金材料的发展已经离不开Nb元素。

关键词: Nb, 变形高温合金, 固溶强化型高温合金, 沉淀强化型高温合金