The basic chemistry of Alloy 706 was developed from Alloy 718 more than 20 years ago but until recently has not been applied to gas turbines. Its excellent chemistry balance has allowed very large ingots to be produced and successfully forged into high quality turbine wheel forgings. This paper describes the metallurgy of Alloy 706, improvements recently made to enhance its producibility and improve its properties, and its application to turbine wheels. A brief review of ultrasonic inspectability is also presented.

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