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

Foreign code F110005228
File No. A281-06WO
Posted date Aug 26, 2011
Country United States of America
Application number 03688008
Gazette No. 20080185078
Gazette No. 8551265
Date of filing Feb 25, 2008
Gazette Date Aug 7, 2008
Gazette Date Oct 8, 2013
Priority data
  • P2005-267964 (Sep 15, 2005) JP
  • 2006WO-JP317939 (Sep 5, 2006) WO
Title Cobalt-base alloy with high heat resistance and high strength and process for producing the same
Abstract (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.
Scope of claims [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.
  • Inventor, and Inventor/Applicant
  • ISHIDA KIYOHITO
  • KAINUMA RYOSUKE
  • OIKAWA KATUNARI
  • OHNUMA IKUO
  • SATO JUN
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) CREST The Innovation of Simulation Technology and the Construction of Foundations for Its Practical Use AREA
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