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 |
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| 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. |
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