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A large Ni-base superalloy 706 disk for advanced gas turbines was trial manufactured and evaluated. Preliminary studies of hot workability, homogenizing treatment and grain refining conditions were made before trial manufacturing. On the basis of these results, trial disk forging with 1900-mm diameter and 310-mm thickness was successfully carried out using electroslag remelted ingot 810~mm in diameter and weighing lo-tons. Ultrasonic and metallographic investigation, and tensile, impact, fatigue and fracture toughness testing were conducted. No macrosegregations and uniform grain structure ASTM G.S.No. 3.2-3.8 were observed in the disk. With ultrasonic testing, the minimum detectable defect size (MDDS) was 2.4-mm in diameter as a flat bottom hole. Observed tensile properties were satisfactory with the AMS5703 (Aero Space Materials specifications), and fatigue and fracture toughness properties were equivalent to those of smaller size forgings of 706 alloy. Superalloys 718,625,706 and Various Derivatives Edited by E.A. Loria The Minerals, Metals & Materials Society, 1994

Manufacturing and Mechanical Properties of a Large Size Alloy 706 Disk by ESR Process