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High-strength co-based alloy with enhanced workability and process for producing the same

Foreign code F110005229
File No. A281-07WO
Posted date Aug 26, 2011
Country United States of America
Application number 09874608
Gazette No. 20080185075
Gazette No. 8529710
Date of filing Apr 7, 2008
Gazette Date Aug 7, 2008
Gazette Date Sep 10, 2013
Priority data
  • 2006WO-JP320688 (Oct 11, 2006) WO
Title High-strength co-based alloy with enhanced workability and process for producing the same
Abstract (US8529710)
A Co-based alloy being useful as a spiral spring, common spring, wire, cable guide, steel belt, build-up material, guide wire, stent, catheter, etc.
There is provided a Co-based alloy having a composition of Co-Al binary system containing 3-13% Al loaded with at least one workability enhancing element selected from among 001 to 50% Ni, 0.01 to 40% Fe and 0.01 to 30% Mn and having a lamellar structure wherein f.c.c. structure alpha-phase and beta(B2)-phase are repeated in layers.
The lamellar structure is so regulated that the occupancy ratio of the whole structure is 30 vol. % or above and the layer spacing is 100 mum or less.
The Co-based alloy may contain at least one optional component selected from among Ga, Cr, V, Ti, Mo, Nb, Zr, W, Ta, Hf, Si, Rh, Pd, Ir, Pt, Au, B, C and P may be added in a total amount of 0.01 to 60%.
Scope of claims [claim1]
1. A high-strength Co-based alloy produced by the steps of: dissolving a Co-based alloy having a composition that comprises, on the basis of mass percent, 3 to 13% of Al, and
[claim2]
0.01 to 60% of one or more workability enhancing elements selected from the group consisting of 0.01 to 50% of Ni, 0.01 to 40% of Fe and 0.01 to 30% of Mn;
solidifying with an average cooling rate of 50 to 200 deg. C/min in the range of 1500 to 600 deg. C.; and
performing cold working at a working ratio of 10% or more;
wherein the high-strength Co-based alloy has a metallic structure having a lamellar structure wherein a f.c.c. structure a-phase and beta (B2)-phase with an interlayer spacing of 100 mu m or less are repeated in layers and the occupancy ratio is 30% by volume or more.
[claim3]
2. A high-strength Co-based alloy produced by the steps of: performing solution treatment at 1100 to 1300 deg. C. on a Co-based alloy having a composition that comprises, on the basis of mass percent, 3 to 13% of Al, and
01 to 60% of one or more workability enhancing elements selected from the group consisting of 0.01 to 50% of Ni, 0.01 to 40% of Fe and 0.01 to 30% of Mn;
performing aging treatment at 550 to 750 deg. C.; and
performing cold working at a working ratio of 10% or more;
wherein the high-strength Co-based alloy has a metallic structure having a lamellar structure wherein a f.c.c. structure a-phase and beta (B2)-type phase with an interlayer spacing of 100 mu m or less are repeated in layers and the occupancy ratio of the lamellar structure to the whole metallic structure is 30% by volume or more.
[claim4]
3. A high strength Co-based alloy produced by the steps of: dissolving a Co-based alloy having a composition that comprises, on the basis of mass percent, 3 to 13% of Al,
[claim5]
0.01 to 60% of one more workability enhancing elements selected from the group consisting of 0.01 to 50% of Ni, 0.01 to 40% of Fe and 0.01 to 30% of Mn, and
[claim6]
0.001% or more in total of at least one element selected from the group consisting of 0.01 to 40% of Cr, 0.01 to 30% of Mo, 0.01 to 5% of Si, 0.01 to 30% of W, 0.01 to 10% of Zr, 0.01 to 15% of Ta, 0.01 to 10% of Hf, 0.01 to 20% of Ga, 0.01 to 20% of V, 0.01 to 12% of Ti, 0.01 to 20% of Nb, 0.001 to 3% of C, 0.01 to 20% of Rh, 0.01 to 20% of Pd, 0.01 to 20% of Ir, 0.01 to 20% of Pt, 0.01 to 10% of Au, 0.001 to 1% of B, and
[claim7]
0.001 to 1% of P in a total of 0.001 to 60%;
solidifying with an average cooling rate of 50 to 200 deg. C/min in the range of 1500 to 600 deg. C.; and
performing cold working at a working ratio of 10% of more;
wherein the high-strength Co-based alloy has a lamellar structure wherein a f.c.c. structure alpha -phase and beta (B2)-type phase,
a L12-type gamma ' phase,
a D019-type precipitate, and/or
a M23C6-type carbide
with an interlayer spacing of 100 mu m or less are repeated in layers and the occupancy ratio of the lamellar structure to the whole metallic structure is 30% by volume or more.
[claim8]
4. A high strength Co-based alloy produced by the steps of: performing solution treatment at 1100 to 1300 deg. C. on a Co-based alloy having a composition that comprises, on the basis of mass percent, 3 to 13% of Al,
[claim9]
0.01 to 60% of one more workability enhancing elements selected from the group consisting of 0.01 to 50% of Ni, 0.01 to 40% of Fe and 0.01 to 30% of Mn, and
[claim10]
0.001% or more in total of at least one element selected from the group consisting of 0.01 to 40% of Cr, 0.01 to 30% of Mo, 0.01 to 5% of Si, 0.01 to 30% of W, 0.01 to 10% of Zr, 0.01 to 15% of Ta, 0.01 to 10% of Hf, 0.01 to 20% of Ga, 0.01 to 20% of V, 0.01 to 12% of Ti, 0.01 to 20% of Nb, 0.001 to 3% of C, 0.01 to 20% of Rh, 0.01 to 20% of Pd, 0.01 to 20% of Ir, 0.01 to 20% of Pt, 0.01 to 10% of Au, 0.001 to 1% of B, and 0.001 to 1% of P in a total of 0.001 to 60%;
solidifying with an average cooling rate of 50 to 200 deg. C/min in the range of 1500 to 600 deg. C.;
performing aging treatment at 550 to 750 deg. C.; and
performing cold working at a working ratio of 10% of more;
wherein the high-strength Co-based alloy has a lamellar structure wherein a f.c.c. structure alpha -phase and beta (B2)-type phase,
a L12-type gamma ' phase,
a D019-type precipitate, and/or
a M23C6-type carbide
with an interlayer spacing of 100mu m or less are repeated in layers and the occupancy ratio of the lamellar structure to the whole metallic structure is 30% by volume or more.
  • Inventor, and Inventor/Applicant
  • ISHIDA KIYOHITO
  • YAMAUCHI KIYOSHI
  • KAINUMA RYOSUKE
  • SUTOU YUJI
  • OMORI TOSHIHIRO
  • 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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