State of the Art of Superalloy Production for Aerospace and Other Application Using VIM/VAR or VIM/ESR.

Vacuum induction melting is indispensable in the manufacture of Ni-and Co-basedsuperalloys and other sophisticated alloys because of their reactivity with atmospheric oxygen and nitrogen.The paper describes the technology of melting and refining in a vacuum induction furnace, the programmablefurnace control and metallurgical results.The paper also describes subsequent remelting processes like VAR and ESRwhich make it possible to meet the very high quality requirements for aerospace applications.