  Zr and Mo macrosegregations were investigated in Ti6246 titanium alloy
industrial-scale ingotby vacuum arc remelting. The formation mechanism of Zr
and Mo macrosegregations was studied during the solidification process. Zr
macrosegregation was characterized by low content in the equiaxed grain zone
and high content in the hot top zone. Mo exhibits an opposite trend with Zr.
The macrosegregations of Zr and Mo were the most pronounced, with a statistic
segregation degree higher than Al and Sn. It could be concluded that
temperature gradient and solidification rate dominated the macrosegregation
formations during the solidification process. The thermal buoyancy made the
negative segregation Zr be continuously discharged to the front of the
solid-liquid interface. Mo was enriched in the solid phase at the solid-liquid
interface as the positive segregation.
