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Zr and Mo macrosegregations were investigated in Ti6246 titanium alloyindustrial-scale ingotby vacuum arc remelting. The formation mechanism of Zrand Mo macrosegregations was studied during the solidification process. Zrmacrosegregation was characterized by low content in the equiaxed grain zoneand 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 statisticsegregation degree higher than Al and Sn. It could be concluded thattemperature gradient and solidification rate dominated the macrosegregationformations during the solidification process. The thermal buoyancy made thenegative segregation Zr be continuously discharged to the front of thesolid-liquid interface. Mo was enriched in the solid phase at the solid-liquidinterface as the positive segregation.

Zr and Mo macrosegregation in Ti6246 titanium alloy industrial-scale ingot by vacuum arc remelting