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In general, Alloy 706 ingots for gas turbine parts are made by the VIM-ESR-VAR triple melt process due to strong segregation tendency of the alloy'). From the viewpoint of cost and delivery time saving, the Japan Steel Works has applied the VIM-ESR double melt process. To optimize ESR condition, relationships between melt rate and local solidification t i e , and between chemical composition and viscosity of slag have been investigated. The calculation shows that there is a range of melt rate which minimizes the local solidification time, and a melt rate between 300 and 400kgh is considered adequate for a dia 650rnrn ingot. Increase in CaF, content in CaF,-Al,O,€aO slag system is found to reduce the viscosity of slag and a slag with high CaF, content, i.e. with low viscosity, is used for industrial scale production. With the optimized ESR conditions obtained in the present study, a dia 650rnrn Alloy 706 ingot has successfUlly been produced with minimum segregation by the VIM-ESR double melt process. Superalloys 718, 625, 706 and Various Derivatives Edited by E.A. Loria TMS (The Minerals, Metals & Materials Society), 2001 71

Making of Alloy 706 Ingot for Gas Turbine Parts