Capacity of 718Plus (registered trademark) for Structural Gas Turbine Engine Components (Preprint)

摘要

Recent developments from the cast 718Plus(R) Metals Affordability Initiative (MAI) program will be presented and discussed. The objective of the program is to investigate and enable the use of 718Plus(R) (hereinafter referred to as 718Plus) in the form of investment castings by (1) increasing the allowable operating temperature by about 75 degrees F as compared with conventional cast Alloy 718 and (2) achieve approximately 25 percent cost savings as compared with cast Waspaloy. This program builds on the successful MAI program for wrought 718Plus. This technology will be implemented for the manufacture of gas turbine structural components including: combustor plenums, stator cases, diffuser cases, turbine cases, turbine frames, and other various high-strength/high-temperature structural castings. An overview of the results from the castability, weldability, and initial mechanical property investigations will be discussed. A preliminary cost benefit to aerospace components after implementation is predicted to be substantial. This recent work has warranted further investigation through the MAI program.