A new nickel superalloy

March 23, 2006

To help electric companies generate fewer greenhouse-gas emissions, alloy producers have been developing nickelbased superalloys.

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Haynes 282 alloy, wrought gammaprime strengthened superalloy, is a candidate for components used in land-based turbines used in power generation.

These materials let land-based turbines run hotter and, thus, generate electricity more efficiently. Hotter combustion also helps keep ozone-depleting emissions in check.

Haynes International Inc., Kokomo, Ind., for example, has developed an advanced, wrought gammaprime strengthened superalloy called Haynes 282. It stands up well to strain-age cracking, a problem common to many gamma-prime strengthened alloys. The 58Ni-19Cr-10Co-8.5Mo-1.5Al-2.1Ti alloy is also a candidate for aircraft manufacturing and other high-performance, high-temperature environments. Reports indicate the alloy is stronger in creep strength than N07001 (Waspaloy) and approaches the creep strength of N07041 (Haynes R-41) at temperatures as high as 1,650°F (900°C). Further, the 282 alloy is easier to weld and fabricate compared to Waspaloy and R-41 alloys.

PHYSICAL PROPERTY COMPARISON
Property	Temperature, °F	Haynes 282*	Waspaloy (N07001)	Haynes R-41 (N07041)
Density, gm/cm3	Room	8.27	8.2	8.25
Thermal conductivity, Btu-in./ft2-hr-°F	800	132	112	116
	1,200	164	139	144
	1,600	187	167	173
Mean coefficient of thermal expansion, μin./in.-°F
	70 to 800	7.3	7.6	7.4
	70 to 1,200	7.5	8.1	8.0
	70 to 1,600	8.7	8.9	8.6
	70 to 1,800	9.3	9.7	9.3
*Preliminary data