Ni based forged alloy, and turbine disc, turbine spacer and gas turbine each using the same

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United States of America Patent

PATENT NO 9512731
APP PUB NO 20140363297A1
SERIAL NO

14300255

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Abstract

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The Ni based forged alloy has a composition containing, on the basis of mass percent, Al: 0.5 to 1.0%, Cr: 17 to 21%, Fe: 17 to 19%, Nb: 4.5 to 5.5%, Ti: 0.8 to 1.3%, W: 3.0 to 6.0%, B: 0.001 to 0.03%, C: 0.001 to 0.015%, and Mo: 1.0% or less, the balance being Ni and inevitable impurities. The alloy includes carbide grains of the contained elements. The carbide grains have an average grain diameter of 20 μm or less. Thus, a Ni based forged alloy is provided which is excellent in high-temperature fatigue property and has a moderate macrosegregation property.

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Patent Owner(s)

  • MITSUBISHI HITACHI POWER SYSTEMS, LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Imano, Shinya Yokohama, JP 84 220
Shibayama, Takashi Yokohama, JP 53 354
Tamaki, Hideki Yokohama, JP 11 168

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