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Age-hardenable nickel-base alloy: RA718 (UNS N07718) is a nickel alloy precipitation hardened by gamma prime and double prime. It is readily fabricated and is weldable even in the aged condition. The alloy is used for gas turbine components at temperatures up to 650[degrees]C (1200[degrees]F) as well as for cryogenic equipment.(Alloy Digest Data Sheet)
From:
Advanced Materials & Processes
| Date:
March 1, 2004
| COPYRIGHT 2004 ASM International. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group.Copyright information
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ALLOY 718 is strengthened by a precipitation hardening reaction involving columbium, titanium, aluminum, and nickel, with a degree of solid-solution strengthening by molybdenum. For alloy RA718, two commonly used heat treatments are as follows.
* Treatment I: Anneal at 925-1010[degrees]C (1700-1850[degrees]F) and air cool or faster. Age at 720[degrees]C (1325[degrees]F) for 8 hours, furnace cool to 620[degrees]C (115[degrees]F), hold at 620[degrees]C (1150[degrees]F) for...
