宇航级钒铝合金脱氮技术探讨

Discussion on Denitrification of Aerospace Grade V-Al Alloy

宇航级钒铝合金氮含量对下游钛合金材料的性能有重要的影响。氮的存在形式主要是自由状态的氮原子和结合状态的氮离子,重点对真空脱除自由状态的氮原子和结合状态的氮离子进行了相关探讨:真空冶炼过程中氮的脱出主要是通过在液相边界层向液气界面扩散。氮元素与铝结合的概率高于其与钒结合的概率,增加机械振动可以加快除去Al N速率。所得产品满足Gf E公司宇航级产品标准要求。

Nitrogen content in aerospace grade vanadium-aluminum(V-Al) alloy has an important influence on properties of the downstream titanium alloy.Nitrogen in V-Al alloy mainly exists as atoms with free state or ions with combination state,and removal for both of nitrogen atoms and ions under vacuum was explored in this paper.Denitrification during the vacuum melting process is mainly realized by nitrogen diffusion to the liquid-gas interface.Furthermore,nitrogen prefers to combine with aluminum in comparison to vanadium,and mechanical vibration can accelerate the elimination of Al N. The product obtained by the proposed method here satisfies the Gf E standards for aerospace grade V-Al alloy.