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Whatever the industrial field, the performances improvement and the new technologies require the use of larger ingots in order to produce large diameter billets and larger parts manufactured with alloys offering better combination of properties such as superalloys. For land gas based application, AUBERT & DUVAL currently and successfully manufactures large alloy 706 rotating components issuing from ingots as large as 1020 mm in diameter and 20 metric tons in weight. This great experience, acquired owing to a well-controlled process, is briefly reviewed. Now, the constant need to achieve higher temperature and consequently better efficiency in new advanced gas turbine requires material with higher properties at elevated temperature. Fine grain alloy 718 is the alternative. To meet this challenge, a process development work has been undertaken to produce a trial disc with a 2000 mm diameter and a 300 mm thickness using a triple melted 7 10 mm diameter ingot. The paper reviews this development program and presents promising results. Superalloys 718, 625, 706 and Various Derivatives Edited by E.A. Loria The Minerals, Metals &Materials Society, 1997

Manufacturing of Large in 706 and in 718 Forging Parts