A New Superalloy
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THE MAGAZINE DEVOTED TO NICKEL AND ITS APPLICATIONS |
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THIS GAS TURBINE COMPONENT was hydroformed from a sheet of alloy 282. |
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ALLOY 282, which contains 58% nickel, has a higher creep strength than N07001.  |
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THIS GAS TURBINE COMPONENT was formed using two hydroforming operations.  |
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日本語
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Land-based turbines that operate at high temperatures require alloys with high creep
strength
Nickel Magazine, November 2005 -- Land-based turbines need to
operate at high temperatures if they are to generate electricity more efficiently and with fewer greenhouse
gas emissions. Toward this end, alloy producers are developing nickel-based superalloys that will withstand
the demanding operating conditions inside these units.
In the United States, Haynes International has developed just such a superalloy that could see service as seamless forged rings in gas turbines.
The advanced, wrought gamma-prime strengthened superalloy HAYNES® 282™ could potentially be used in aircraft manufacturing and other high-performance, high-temperature environments. The alloy contains 58% nickel, 19% chromium, 10% cobalt, 8.5% molybdenum, 1.5% aluminum and 2.1% titanium.
"The 282 is a unique superalloy which combines exceptional high-temperature properties with good weldability and fabricability," says Lee Flower, market manager for Haynes. Even at temperatures as high as 900°C the alloy is stronger in creep strength than N07001 (Waspaloy™) and approaches the creep strength of N07041 (Rene 41™) alloy. Furthermore, the 282 has much better thermal stability, weldability, and fabricability than Waspaloy and Rene 41 alloys.
The accompanying photos illustrate the formability of 282 alloy sheet. To form this gas turbine component, two hydroforming operations were conducted without an intermediate anneal.
Several full-scale vacuum induction melting-electro slag remelting (VIM-ESR) heats have been produced to
various product forms, including plate, sheet, bar, forging billet, and welding wire. Preliminary data are
available, as are samples for testing. Commercial-scale products are available for component manufacturing
trials.
PHOTOS: Haynes International
Lee Flower |
