电子束冷床熔炼TC4合金元素挥发机制研究

建立了TC4合金电子束冷床熔炼过程熔体中各元素饱和蒸气压的数学计算模型,利用该模型计算了TC4合金熔体中各元素的饱和蒸气压及其挥发速率,与实验结果基本一致。计算结果表明,在相同温度下,Al元素的饱和蒸气压最大,是其它两种元素的几百倍,挥发损失也最为严重。随着熔体温度的增加,挥发趋势也增大。V元素的挥发很少,可以忽略。此外,电子束冷床熔炼去除杂质效果显著,熔炼出的铸锭成分符合国家标准。

Research on Evaporation Mechanism of Elements in TC4 Alloys during Electron Beam Cold Hearth Melting

A mathematical model was set up to calculate the saturated vapor pressure of components in TC4 alloys during electron beam cold hearth melting (EBCHM). The saturated vapor pressure and evaporation rate of components in TC4 alloy were calculated by this model, whose results basically agree with the experiment results. The calculation result shows that at the same temperature the saturated vapor pressure of Al is the biggest, about hundreds of times as large as others, and the evaporation loss is also the most serious. With the increase of the melt temperature, the evaporation trend increases. The evaporation loss of V is very little, which can be neglected. Moreover, electron beam cold hearth melting has the prominent effect in removing inclusions, and it can produce the slabs achieving the national standard.