IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0955392
(1992-10-01)
|
|
발명자
/ 주소 |
- Ross Earl W. (Cincinnati OH) Wukusick Carl S. (Cincinnati OH) King Warren T. (Cincinnati OH)
|
| 출원인 / 주소 |
- General Electric Company (Cincinnati OH 02)
|
| 인용정보 |
피인용 횟수 :
44 인용 특허 :
0 |
초록
▼
There is provided by the present invention nickel-base superalloys for producing single crystal articles having improved tolerance to low angle grain boundaries and an improved balance between cyclic oxidation and hot corrosion resistance. The improved tolerance arises from the discovery that nickel
There is provided by the present invention nickel-base superalloys for producing single crystal articles having improved tolerance to low angle grain boundaries and an improved balance between cyclic oxidation and hot corrosion resistance. The improved tolerance arises from the discovery that nickel-base superalloys suitable for casting as single crystal articles can be improved by the addition of small, but controlled, amounts of boron and carbon, and optionally hafnium, and is manifested principally by improved grain boundary strength. As one result of this increased grain boundary strength, grain boundary mismatches far greater than the 6°limit for prior art single crystal superalloys can be tolerated in single crystal articles made from the nickel-base superalloys of this invention. This translates, for example, into lower inspection costs and higher casting yields as grain boundaries over a broader range can be accepted by visual inspection techniques without resort to expensive X-ray techniques. These alloys are especially useful when directionally solidified as hot-section components of aircraft gas turbine engines, particularly rotating blades and stationary vanes. The superalloy contains by weight percent, 7-12 Cr, 5-15 Co, 0.5-5 Mo, 3-12 W, 2-6 Ta, 2-5 Ti, 3-5 Al, 0- 2 Cb, 0.1-0.2 Hf, 0.05-0.07 C, 0.002-0.05 B, and nickel.
대표청구항
A nickel-base superalloy consisting essentially of, in percentages by weight, 9.5-10.0 Cr, 7.0-8.0 Co, 1.3-1.7 Mo, 5.75-6.25 W, 4.6-5.0 Ta, 3.4-3.6 Ti, 4.1-4.3 Al, 0.4-0.6 Cb, 0.1-0.2 Hf, 0.05-0.07 and 0.003-0.005 B, the balance being nickel and incidental impurities.
A nickel-base superalloy consisting essentially of, in percentages by weight, 9.5-10.0 Cr, 7.0-8.0 Co, 1.3-1.7 Mo, 5.75-6.25 W, 4.6-5.0 Ta, 3.4-3.6 Ti, 4.1-4.3 Al, 0.4-0.6 Cb, 0.1-0.2 Hf, 0.05-0.07 and 0.003-0.005 B, the balance being nickel and incidental impurities.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.