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Cobalt-base alloy with high heat resistance and high strength and process for producing the same UPDATE

外国特許コード F110005228
整理番号 A281-06WO
掲載日 2011年8月26日
出願国 アメリカ合衆国
出願番号 03688008
公報番号 20080185078
公報番号 8551265
出願日 平成20年2月25日(2008.2.25)
公報発行日 平成20年8月7日(2008.8.7)
公報発行日 平成25年10月8日(2013.10.8)
優先権データ
  • 特願2005-267964 (2005.9.15) JP
  • 2006WO-JP317939 (2006.9.5) WO
発明の名称 (英語) Cobalt-base alloy with high heat resistance and high strength and process for producing the same UPDATE
発明の概要(英語) (US8551265)
A Co-base alloy which has a basic composition including, in terms of mass proportion, 0.1%-10% Al, 3.0-45% W, and Co as the remainder and has an intermetallic compound of the Ll2 type [Co3(Al,W)] dispersed and precipitated therein.
Part of the Co may be replaced with Ni, Ir, Fe, Cr, Re, or Ru, while part of the Al and W may be replaced with Ni, Ti, Nb, Zr, V, Ta or Hf.
The intermetallic compound [Co3(Al, W)] has a high melting point, and this compound and the matrix are mismatched little with respect to lattice constant.
Thus, the cobalt-base alloy can have high-temperature strength equal to that of nickel-base alloys and excellent structure stability.
特許請求の範囲(英語) [claim1]
1. A cobalt-base alloy with high heat resistance and high strength comprising: in a cobalt-base alloy comprising a composition of, in terms of mass proportion, 0.1 to 10% of Al, 3.0 to 45% of W, and Co as a remainder containing indispensable impurities, a metal texture in which a Ll2-type intermetallic compound (gamma ' phase) of Co3(Al, W) by atom ratio is precipitated, the Ll2-type intermetallic compound is precipitated under conditions where the particle diameter is 10 nm to 1 mu m and the precipitation amount is 40 to 85% by volume, and the mismatch of the lattice constant between the gamma ' phase and matrix (y phase) is 0.5% or less.
[claim2]
2. A cobalt-base alloy with high heat resistance and high strength, produced by the steps of: solution-treating the cobalt-base alloy with the composition according to claim 1 in the temperature range of 1100-1400 deg. C. for 1-2 hours; and
performing aging treatment in the temperature range of 500-1100 deg. C. for 1-168 hours.
[claim3]
3. The cobalt-base alloy with high heat resistance and high strength according to claim 1, further comprising: one or more components selected from the following
Group (I) in a total of 0.001 to 2.0% by mass, wherein
Group (I): 0.001 to 1% of B, 0.001 to 2.0% of C, 0.01 to 1.0% of Y, and 0.01 to 1.0% of La or misch metal.
[claim4]
4. A cobalt-base alloy with high heat resistance and high strength produced by the steps of: solution-treating the cobalt-base alloy with the composition according to claim 3 in the temperature range of 1100-1400 deg. C. for 1-2 hours; and
performing aging treatment in the temperature range of 500-1100 deg. C. for 1-168 hours.
[claim5]
5. The cobalt-base alloy with high heat resistance and high strength according to claim 1, further comprising: one or more components selected from the following Group (II) in a total of 0.1 to 50%;
wherein an Ll2-type intermetallic compound precipitated is (Co,X)3(Al,W,Z) by atom ratio;
wherein, X is Ir, Fe, Cr, Re, and/or Ru, Z is Mo, Ti, Nb, Zr, V, Ta, and/or Hf, and nickel can be comprised in both X and Z; and Group (II): 50% or less of Ni, 50% or less of Ir, 10% or less of Fe, 20% or less of Cr, 15% or less of Mo, 10% or less of Re, 10% or less of Ru, 10% or less of Ti, 20% or less of Nb, 10% or less of Zr, 10% or less of V, 20% or less of Ta, and 10% or less of Hf.
[claim6]
6. A cobalt-base alloy produced by the steps of: solution-treating the cobalt-base alloy according to claim 5 in the temperature range of 1100 to 1400 deg. C. for 1 to 2 hours; and
performing aging treatment in the temperature range of 800 to 1000 deg. C. for 1 to 168 hours.
[claim7]
7. The cobalt-base alloy with high heat resistance and high strength according to claim 1, further comprising: one or more components selected from the following Group (I) in a total of 0.001 to 2.0%; and
one or more components selected from the following Group (II) in a total of 0.1 to 50%;
wherein the Ll2-type intermetallic compound precipitated is (Co,X)3(Al,W,Z) by atom ratio; wherein, X is Ir, Fe, Cr, Re, and/or Ru, Z is Mo, Ti, Nb, Zr, V, Ta, and/or Hf, and nickel can be comprised in both X and Z;
Group (I): 0.001 to 1% of B, 0.001 to 2.0% of C, 0.01 to 1.0% of Y, and 0.01 to 1.0% of La or misch metal; and
Group (II): 50% or less of Ni, 50% or less of Ir, 10% or less of Fe, 20% or less of Cr, 15% or less of Mo, 10% or less of Re, 10% or less of Ru, 10% or less of Ti, 20% or less of Nb, 10% or less of Zr, 10% or less of V, 20% or less of Ta, and 10% or less of Hf.
[claim8]
8. A cobalt-base alloy with high heat resistance and high strength produced by the steps of: solution-treating the cobalt-base alloy according to claim 7 in the temperature range of 1100 to 1400 deg. C. for 1 to 2 hours; and
performing aging treatment in the temperature range of 800 to 1000 deg. C. for 1 to 168 hours.
  • 発明者/出願人(英語)
  • ISHIDA KIYOHITO
  • KAINUMA RYOSUKE
  • OIKAWA KATUNARI
  • OHNUMA IKUO
  • SATO JUN
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • C22C019/07
  • C22F001/10
参考情報 (研究プロジェクト等) CREST The Innovation of Simulation Technology and the Construction of Foundations for Its Practical Use AREA
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