Production method for alloy 690 ordered alloy of improved thermal conductivity, and alloy 690 ordered alloy produced thereby

Patent metadata

Field	Value
Publication number	US-10287664-B2
Application number	US-201414896647-A
Country	US
Kind code	B2
Filing date	Jun 5, 2014
Priority date	Jun 7, 2013
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

The present invention relates to ordered Alloy 690 with improved thermal conductivity. By maintaining Alloy 690 in a temperature range of 350-570° C. for a proper amount of time, the atomic arrangement is controlled to properly form the ordered phases. The ordered phases formed in the ordered Alloy 690 increases its thermal conductivity due to a low thermal scattering effect of the ordered phase as observed in pure metals.

First claim

The invention claimed is:

1. A method of manufacturing a Ni-based alloy, the method comprising:
solution-annealing Alloy 690;
performing a first thermal treatment for the solution-annealed Alloy 690 at a temperature within a first range of 700-750° C. for a period of 15-24 hours to provide a first-treated Alloy 690; and
subsequently performing a second thermal treatment for the first-treated Alloy 690 at a temperature within a second range of 350-570° C., which provides a second-treated Alloy 690 that has a thermal conductivity rate higher than that of the first-treated Alloy 690 by at least 8%.

2. The method of claim 1 , wherein the second thermal treatment follows the first thermal treatment without cooling the first-treated Alloy 690 resulting from the first thermal treatment to room temperature.

3. A method of manufacturing a Ni-based alloy, the method comprising:
providing Alloy 690;
performing a first thermal treatment for the Alloy 690 at a temperature within a first range of 700-750° for a period of 15-24 hours to provide a first-treated Alloy 690; and
subsequently performing a second thermal treatment for the first-treated Alloy 690 at a temperature within a second range of 350-570° C., which provides a second-treated Alloy 690 that has a thermal conductivity rate higher than that of the first-treated Alloy 690 by at least 8%.

4. The method according to claim 1 , wherein the second range is 400-510° C.

5. The method according to claim 3 , wherein the second range is 400-510° C.

6. The method according to claim 1 , wherein the second thermal treatment comprises reducing the temperature within the second range at a rate of 1° C./min or lower.

7. The method according to claim 4 , wherein the second thermal treatment comprises reducing the temperature within the second range at a rate of 1° C./min and lower.

8. The method according to claim 1 , wherein the second thermal treatment comprises a process of cooling and heating within the second range at least once.

9. The method according to claim 4 , wherein the second thermal treatment comprises a process of cooling and heating within the second range at least once.

10. The method according to claim 1 , wherein the second thermal treatment is performed at two or more different temperatures within the second range.

11. The method according to claim 4 , wherein the second thermal treatment is performed at two or more different temperatures within the second range.

12. The method according to claim 1 , wherein a process of cooling and heating is performed at least once at two or more different temperatures within the second range.

13. The method according to claim 4 , wherein cooling and heating processes are performed at least once at two or more different temperatures within the second range.

Assignees

• Korea Atomic Energy Res

Inventors

• Kim Young-Suk
• Kim Sung-Soo
• Kim Dae-Whan

Classifications

• C22F1/10 Primary

  of nickel or cobalt or alloys based thereon · CPC title

• C22C19/058

  without Mo and W · CPC title

• C21D1/26

  Methods of annealing · CPC title

• C21D1/84

  Controlled slow cooling (cooling-beds for metal rolling B21B43/00) · CPC title