Ni-based superalloy, and turbine rotor and stator blades for gas turbine using the same

Patent metadata

Field	Value
Publication number	US-9574451-B2
Application number	US-201514687535-A
Country	US
Kind code	B2
Filing date	Apr 15, 2015
Priority date	Dec 28, 2010
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

An object of the present invention is to provide a Ni-based superalloy, especially for a conventional casting, having a good balance among high temperature strength, corrosion resistance and oxidation resistance, as compared to a conventional material. The Ni-based superalloy comprises Cr, Co, Al, Ti, Ta, W, Mo, Nb, C, B, and inevitable impurities, the balance being Ni, the Ni-based superalloy having a superalloy composition comprising, by mass, 13.1 to 16.0% Cr, 11.1 to 20.0% Co, 2.30 to 3.30% Al, 4.55 to 6.00% Ti, 2.50 to 3.50% Ta, 4.00 to 5.50% W, 0.10 to 1.20% Mo, 0.10 to 0.90% Nb, 0.05 to 0.20% C, and 0.005 to 0.02% B.

First claim

What is claimed is:

1. A Ni-based superalloy comprising Cr, Co, Al, Ti, Ta, W, Mo, Nb, C, B, O, N, and inevitable impurities, the balance being Ni, the Ni-based superalloy having a superalloy composition comprising, by mass, 13.1 to 14.3% of Cr, 13.1 to 18.0% of Co, 2.60 to 3.30% of Al, 4.65 to 5.50% of Ti, 2.70 to 3.30% of Ta, 4.55 to 4.90% of W, 0.10 to 1.10% of Mo, 0.10 to 0.65% of Nb, 0.10 to 0.18% of C, 0.01 to 0.02% of B, 0.001 to 0.005% of 0, and 0.001 to 0.055% of N.

2. The Ni-based superalloy according to claim 1 , wherein the Ni-based superalloy has a superalloy composition comprising, by mass, 13.7 to 14.1% of Cr, 14.1 to 17.0% of Co, 3.00 to 3.20% of Al, 4.70 to 5.10% of Ti, 2.90 to 3.20% of Ta, 4.55 to 4.85% of W, 0.70 to 1.00% of Mo, 0.25 to 0.45% of Nb, and 0.12 to 0.17% of C.

3. A cast product comprising a Ni-based superalloy according to claim 1 .

4. A turbine rotor blade for a gas turbine comprising a Ni-based superalloy according to claim 1 .

5. A turbine stator blade for a gas turbine comprising a Ni-based superalloy according to claim 1 .

6. A Ni-based superalloy comprising Cr, Co, Al, Ti, Ta, W, Mo, Nb, C, B, O, N, Hf, Re, Zr, P, S, and inevitable impurities, the balance being Ni, the Ni-based superalloy having a superalloy composition comprising, by mass, 13.1 to 16.0% of Cr, 11.1 to 20.0% of Co, 2.30 to 3.30% of Al, 4.55 to 6.00% of Ti, 2.50 to 3.50% of Ta, 4.00 to 5.50% of W, 0.10 to 1.20% of Mo, 0.10 to 0.90% of Nb, 0.05 to 0.20% of C, 0.005 to 0.02% of B, 0.001 to 0.005% of 0, 0.001 to 0.055% of N, 0.01 to 2.00% of Hf, 0.003 to 0.50% of Re, 0.01 to 0.05% Zr, 0.001 to 0.004% of P, and 0.001 to 0.005% of S.

7. The Ni-based superalloy according to claim 6 , wherein the Ni-based superalloy has a superalloy composition comprising, by mass, 0.01 to 0.04% of Hf.

8. The Ni-based superalloy according to claim 7 , wherein the Ni-based superalloy has a superalloy composition comprising, by mass, 0.003 to 0.10% Re, and 0.01 to 0.03% Zr.

9. A cast product comprising a Ni-based superalloy according to claim 6 .

10. A turbine rotor blade for a gas turbine comprising a Ni-based superalloy according to claim 6 .

11. A turbine stator blade for a gas turbine comprising a Ni-based superalloy according to claim 6 .

12. A turbine rotor blade for a gas turbine comprising a Ni-based superalloy comprising Cr, Co, Al, Ti, Ta, W, Mo, Nb, C, B, O, N, Hf, Re, Zr, P, S, and inevitable impurities, the balance being Ni, the Ni-based superalloy having a superalloy composition comprising, by mass, 13.1 to 16.0% of Cr, 11.1 to 20.0% of Co, 2.30 to 3.30% of Al, 4.55 to 6.00% of Ti, 2.50 to 3.50% of Ta, 4.00 to 5.50% of W, 0.10 to 1.20% of Mo, 0.10 to 0.90% of Nb, 0.05 to 0.20% of C, 0.005 to 0.02% of B, 0.001 to 0.005% of 0, 0.001 to 0.005% of N, 0.01 to 2.00% of Hf, 0 to 0.50% of Re, 0.01 to 0.05% Zr, 0.001 to 0.004% of P, and 0.001 to 0.005% of S.

13. A turbine stator blade for a gas turbine comprising a Ni-based superalloy comprising Cr, Co, Al, Ti, Ta, W, Mo, Nb, C, B, O, N, Hf, Re, Zr, P, S, and inevitable impurities, the balance being Ni, the Ni-based superalloy having a superalloy composition comprising, by mass, 13.1 to 16.0% of Cr, 11.1 to 20.0% of Co, 2.30 to 3.30% of Al, 4.55 to 6.00% of Ti, 2.50 to 3.50% of Ta, 4.00 to 5.50% of W, 0.10 to 1.20% of Mo, 0.10 to 0.90% of Nb, 0.05 to 0.20% of C, 0.005 to 0.02% of B, 0.001 to 0.005% of 0, 0.001 to 0.005% of N, 0.01 to 2.00% of Hf, 0 to 0.50% of Re, 0.01 to 0.05% Zr, 0.001 to 0.004% of P, and 0.001 to 0.005% of S.

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Wang Yuting
• Yoshinari Akira

Classifications

• C22C1/023

  Alloys based on nickel · CPC title

• C22C19/056

  with the maximum Cr content being at least 10% but less than 20% · CPC title

• C22F1/10

  of nickel or cobalt or alloys based thereon · CPC title

• F05D2300/175

  Superalloys · CPC title

• F01D5/28 Primary

  Selecting particular materials; {Particular measures relating thereto;} Measures against erosion or corrosion · CPC title