充氩熔炼对钛合金铸锭中Al、Mo、Fe元素偏析影响

Influence of Argon-filling VAR on Segregation of Compositions of Al,Mo and Fe in Titanium Alloy Ingot

设计熔炼三个配料值均为4.6Al2.0Fe2.0Mo钛合金铸锭,研究不同熔炼方式对铸锭成分均匀性的影响,对1#锭(两次熔炼)、2~#锭(第三次次充氩熔炼)、3~#锭(二次、三次均充氩熔炼)进行熔炼并进行径向取样和轴向取样检测成分,得出以下结论:VAR熔炼的铸锭冒口端和中心处Fe富集,Al、Mo等元素冒口端和中心部位含量降低;通过充氩能够在一定程度上改善Fe、Mo偏析和Al挥发;而通过两次充氩熔炼铸锭径向成分和轴向成分均匀性最为理想,可得到Fe轴向偏差小于0.02,径向偏差小于0.26,Mo偏差小于0.06的铸锭。

Three titanium alloy ingots were melted with the same ingredient of 4.6 Al2.0 Fe2.0 Mo to find out the in-fluence of argon-filling VAR on composition homogeneousness of the ingots. All the three ingots were melted by VAR,1~#ingot was melted without argon for both its first and second melts, 2~# ingot without argon for its first and second meltsand with argon for its third melt, 3~#ingot without argon for its first melt and with argon for its second and third melts.Samples were taken from radial and axial directions of the melted ingots and tested.The testing results have shown thatFe was concentrated but compositions such as Al and Mo were decreased at the center and risers of the ingots; The seg-regation of Fe and Mo and volatilization of Al were reduced to a certain degree by one argon-filling VAR, while thebest composition homegeneousness in both radial and axial direction was achieved by double argon-filling VARs withdifferences in content of Fe in radial and axial directions were less than 0.02 and 0.26 respectively, and difference ofMo content was less than 0.06.