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Method of forming fine grains of Co-Cr-Mo alloy with nitrogen addition and Co-Cr-Mo alloy with nitrogen addition

Foreign code F120006131
File No. S2008-0597
Posted date Jan 6, 2012
Country United States of America
Application number 200913060593
Gazette No. 20110209799
Gazette No. 8460485
Date of filing Sep 2, 2009
Gazette Date Sep 1, 2011
Gazette Date Jun 11, 2013
International application number JP2009065358
International publication number WO2010026996
Date of international filing Sep 2, 2009
Date of international publication Mar 11, 2010
Priority data
  • P2008-227875 (Sep 5, 2008) JP
  • 2009WO-JP65358 (Sep 2, 2009) WO
Title Method of forming fine grains of Co-Cr-Mo alloy with nitrogen addition and Co-Cr-Mo alloy with nitrogen addition
Abstract (US8460485)
A Co-Cr-Mo alloy with nitrogen addition composed of 26 to 35% by weight of Cr, 2 to 8% by weight of Mo, 0.1 to 0.3% by weight of N, and balance of Co is subjected to solution treatment and then subjected to isothermal aging treatment holding the alloy at 670 to 830° C. for a predetermined period of time to form a multi-phase structure composed of an epsilon-phase and a Cr nitride by means of an isothermal aging effect.
After cooling, the alloy subjected to reverse transformation treatment in which the alloy is heated at a temperature range of 870 to 1100° C. for reverse transformation to a single gamma-phase from the multi-phase structure composed of an epsilon-phase and a Cr nitride.
Scope of claims [claim1]
1. A method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition, comprising: subjecting a Co -- Cr -- Mo alloy with nitrogen addition composed of 26 to 35% by weight of Cr, 2 to 8% by weight of Mo, 0.1 to 0.3% by weight of N, and balance of Co to a solution treatment;
subjecting the alloy to an isothermal aging treatment by holding the alloy at 670 to 830 deg. C. for a predetermined period of time to form a multi-phase structure composed of an s-phase and a Cr nitride by means of the isothermal aging treatment;
cooling the alloy; and
subjecting the alloy to a reverse transformation treatment in which the alloy is heated at a temperature range of 870 to 1100 deg. C. for reverse transformation to a single gamma -phase from the multi-phase structure composed of an s-phase and a Cr nitride.
[claim2]
2. The method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition according to claim 1, wherein the Co -- Cr -- Mo alloy with nitrogen addition to be subjected to the solution treatment contains 0.2% by weight or less of Ni.
[claim3]
3. The method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition according to claim 1, wherein the Co -- Cr -- Mo alloy with nitrogen addition to be subjected to the solution treatment contains 0.35% by weight or less of C.
[claim4]
4. The method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition according to claim 1, wherein the holding time of the isothermal aging treatment is 63000 seconds or more.
[claim5]
5. The method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition according to claim 1, wherein the reverse transformation treatment is performed at a temperature range of 920 to 1000 deg. C. for 300 seconds or more.
[claim6]
6. The method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition according to claim 1, wherein the reverse transformation treatment is performed at a temperature range of 1000 to 1100 deg. C. for 50 seconds or more.
[claim7]
7. The method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition according to claim 1, further comprising: cooling the alloy after the reverse transformation treatment: and
repeating the isothermal aging treatment and the reverse transformation treatment.
  • Inventor, and Inventor/Applicant
  • KUROSU SHINGO
  • CHIBA AKIHIKO
  • MATSUMOTO HIROAKI
  • TOHOKU UNIVERSITY
IPC(International Patent Classification)
U.S. Cl./(Sub)
  • A61L027/04F
  • C22C019/07
  • C22F001/00
  • C22F001/10
  • K61F002/30M
  • K61F002/38
  • K61F310/00A2F
  • M21D201/03
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