ABSTRACT

In the smelting process of large castings, the addition of deoxidiser is bound to introduce other elements, such as Al and Ti. This research investigates the influence of Al and Ti on the precipitation behaviour of the γ” phase in cast alloy 625. The results showed that Al and Ti can improve the supersaturation of Nb in inter-dendritic zones during long-term aging. Furthermore, Al and Ti atoms replace partial Nb atoms in the γ” phase and promote the precipitation and growth of γ”, which lead to an increase in strength at high temperatures.

中文翻译：

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Al和Ti对铸造合金625中γ”析出行为的影响

摘要

在大型铸件的熔炼过程中，脱氧剂的加入势必会引入其他元素，例如Al和Ti。本研究研究了Al和Ti对铸造合金625中γ”相的析出行为的影响。结果表明，Al和Ti可以改善长期时效过程中枝晶间区Nb的过饱和。此外，Al和Ti原子替代γ”相中的部分Nb原子，并促进γ”的沉淀和生长，从而导致高温强度的增加。