C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 19/05 (2006.01)
Patent
CA 2729117
Provided is an Ni-based single crystal superalloy wherein the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to 2.0% by mass of Mo, from 3.0% by mass to 8.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to 0.50% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 1.0% by mass to 10.0% by mass of Ru, with the balance of Ni and inevitable impurities. The alloy prevents TCP phase precipitation at high temperatures, therefore having improved strength at high temperatures and having oxidation resistance at high temperatures. The above-mentioned first-generation alloy CMSX-2 and second-generation alloy CMSX-4 are, though comparable thereto in point of creep strength at low temperatures, inferior to third-generation alloys in point of creep strength at high temperatures, since a large quantity of eutectic .gamma.'- phase remains therein even after high-temperature solution treatment.
Linvention concerne un superalliage monocristallin à base de Ni qui a une composition constituée, en pourcentages en masse, de 5,0 à 7,0 % dAl, 4,0 à 8,0 % de Ta, 0 à 2,0 % de Mo, 3,0 à 8,0 % de W, 3,0 à 8,0 % de Re, 0 à 0,50 % de Hf, 3,0 à 7,0 % de Cr, 0 à 9,9 % de Co, 1,0 à 10,0 % de Ru, le reste étant du Ni et dinévitables impuretés. Le superalliage monocristallin à base de Ni ne présente pas de précipitation de phase TCP aux températures élevées, et sa résistance est par conséquent améliorée aux températures élevées. Il présente en même temps une résistance à loxydation aux températures élevées.
Harada Hiroshi
Kawagishi Kyoko
Kitashima Tomonori
Kobayashi Toshiharu
Koizumi Yutaka
National Institute For Materials Science
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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