Abstract:Water-cooling crucible vacuum induction melting is a good method for melting reactive alloys, the molten metal prepared has a homogenous composition, temperature and degree of superheating. The melting procedure of theγ-TiAl based alloys melted with water-cooling crucible vacuum induction melting furnace was studied and the results showed that the non-uniform composition in the skull determined by the forming processing of the skull and the evaporation of alloying elements with higher vapor pressure results in a composition difference between nominal and analyzing composition. There would be a sedimentation of large density alloying element in the molten metal because of density difference. The problem above mentioned can be solved by controlling the melting parameters and applying master alloy.

Key words: γ-TiAl　cold crucible　induction melting　skull