Gas Turbine Superalloy
GAS TURBINE SUPERALLOY WITH IMPROVED FABRICABILITY A wrought gamma-prime strengthened superalloy combines high-temperature strength with excellent formability for gas turbine engine components. Lee M. Pike* H. Lee Flower* Haynes International Kokomo, Indiana new wrought nickel-chromium-cobalt- molybdenum superalloy, designated Haynes 282 alloy, possesses a unique combination The Haynes 282 alloy is designed for applications in engines for aircraft such of high-temperature strength and fabri- as the Lockheed Martin F-35 Joint Strike Fighter. cability that gives it a distinct advantage Aover other alloys. The attributes of the alloy are cracking. On the other hand, higher levels of well suited for a wide variety of high-tempera- gamma-prime are beneficial for high-tempera- ture applications, particularly those in aero and ture strength. Therefore, the gamma-prime con- land-based gas turbine engines. tent is balanced so that 282 alloy is easy to fabri- With 57% nickel, 20% chromium, 10% cobalt, cate, yet still possesses excellent creep strength. and 8.5% molybdenum (Table 1), the alloy falls The features of 282 alloy make it suitable for into a subcategory within the larger category of critical applications such as sheet fabrications and the familiar gamma-prime-strengthened super- seamless and flash butt-welded rings found in alloys. This subcategory includes such alloys as compressor, combustor, and turbine sections. In Waspaloy, René-41 (or R-41), and 263, which are augmented aircraft gas turbines, the new alloy distinguished by their ability to be produced as will be useful for exhaust and nozzle components. flat products; that is, in the form of hot-rolled plate In land-based gas turbines, 282 alloy is a good op- and/or cold-rolled sheet.
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