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目前某些燃气轮机系采用钽合金化的镍基合金制造。关于钽在镍基合金中的作用现报导不多,钽为昂贵元素,为尽可能地节约钽在镍基合金中的用量,本文在8Cr-10Co-6Mo-6Al-1Ti镍基合金中加入了不同钽量以研究钽在合金中的作用。结果指出:在所研究的合金中,钽是强化γ′相的主要元素。合金中钽含量的80％左右溶入γ′相。同时随合金中钽含量的增加,合金中γ′相的数量及γ′相中钽的含量都相应提高,而γ′相的数量及组成则是明显影响合金热强化性的。不同于文献[1]“钽合金化的镍—铝合金热强性的提高基本上同γ′相体积百分数的增加没有联系,而与成份变化有关”的观点;也不同于“钽主要是固溶强化”的观点。此外还发现合金中钽含量的15％左右参与形成富钽的MC型碳化物,MC相的稳定性与合金中的钽含量有直接的关系;其余5％左右的钽则残留在固溶体中起强化固溶体作用。合金的强度、塑性、抗冷热疲劳性能及抗海洋性燃气腐蚀性能都因加入适量的钽而有所改善。
At present, some gas turbine engines are made of tantalum-alloyed nickel-based alloys. About the role of tantalum in nickel-based alloys is reported little, tantalum is an expensive element, in order to save as much as possible the amount of tantalum in nickel-based alloys, this article 8Cr-10Co-6Mo-6Al-1Ti nickel-based alloys added Different amounts of tantalum to study the role of tantalum in the alloy. The results indicate that tantalum is the main element that strengthens the γ ’phase in the alloys studied. Alloy tantalum content of about 80% dissolved into γ ’phase. At the same time, with the increase of tantalum content in the alloy, the amount of γ ’phase in the alloy and the content of tantalum in γ’ phase are correspondingly increased, while the amount and composition of γ ’phase significantly affect the thermal strengthening property of the alloy. In contrast to the literature [1], “the increase of the hot strength of a tantalum alloyed nickel-aluminum alloy is basically not related to the increase of the volume fraction of the γ ’phase, but is related to the compositional change”; also unlike the fact that “tantalum is mainly solid Strengthen the ”point of view. In addition, about 15% of the tantalum content in the alloy is also involved in the formation of MC-rich carbides. The stability of the MC phase is directly related to the tantalum content in the alloy. The remaining 5% of the tantalum remains in the solid solution for strengthening Solid solution. Alloy strength, plasticity, thermal fatigue resistance and anti-marine gas corrosion due to the addition of the right amount of tantalum and improved.