Metal treatment – Stock – Age or precipitation hardened or strengthened
Patent
1997-02-07
2000-04-18
Ip, Sikyin
Metal treatment
Stock
Age or precipitation hardened or strengthened
148404, 148428, 148462, 420448, C22C 1900, C22C 1905
Patent
active
060510838
ABSTRACT:
In order to provide a high strength Ni-base superalloy for directionally solidified castings, which is prevented from solidification cracking at the casting, having a sufficient grain boundary strength for ensuring reliability during its operation and a superior high temperature concurrently, a high strength Ni-base superalloy for directionally solidified castings having a superior grain boundary strength, which contains C: 0.05% to less than 0.1%, B: 0.015% to 0.04%, Hf: 0.01.about.less than 0.5%, Zr: less than 0.01%, Cr: 1.5%.about.16%, Mo: utmost 6%, W: 2.about.12%, Re: 0.1.about.9%, Ta: 2.about.12%, Nb: utmost 4%, Al: 4.5.about.6.5%, Ti: less than 0.5%, Co: less than 9%, and Ni: at least 60% in weight, is disclosed.
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Kageyama Kagehiro
Kobayashi Mitsuru
Ohno Takehiro
Okayama Akira
Tamaki Hideki
Hitachi , Ltd.
Hitachi Metals
Ip Sikyin
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