NICKEL BASED SUPERALLOY WITH HIGH OXIDATION RESISTANCE, HIGH CORROSION RESISTANCE AND GOOD PROCESSABILITY

Abstract

Nickel based super alloy, which includes at least, (in wt %): Iron (Fe) 1.5%-6.5% especially 3.5%-5.5%; Chrome (Cr) 12.0%-14.0%; Molybdenum (Mo) 1.0%-2.0%; Wolfram (W) 2.0%-5.0%; Aluminum (Al) 5.2%-5.8%; Tantalum (Ta) 5.0%-7.0%; Hafnium (Hf) 1.2%-1.8%; Silicon (Si) 0.005%-0.4%; Carbon (C) 0.005%-0.1%; Nickel (Ni), optionally Cobalt (Co) 0.0%-5.0%; especially at least 1.0 wt % Cobalt (CO); Boron (B) >0.0%-0.02%; especially maximum 0.005%; Zirconium (Zr) >0.0%-0.05%; especially maximum 0.01% 0-0.05%; reactive element(s), especially Yttrium (Y), Cerium (Ce), Dysprosium (Dy), and/or Lanthanum (La).

Claims

1.-28. (canceled)

29. A Nickel based super alloy, which comprises at least, especially consists of (in wt %): TABLE-US-00002 Iron (Fe) 1.5-6.5, especially 2.5-4.5, Chromium (Cr) 12.0-14.0, Molybdenum (Mo) 1.0-2.0, especially 1.1-1.6, Wolfram (W) 2.0-5.0, especially 2.5-4.0, Aluminum (Al) 5.2-5.8, Tantalum (Ta) 5.0-7.0, especially 6.0-7.0, Hafnium (Hf) 1.2-1.8, Nickel (Ni), optionally Cobalt (Co) 0.0-5.0, especially 0.0-4.0, Silicon (Si) 0.005-0.4 Carbon (C) 0.005-0.1 Boron (B) >0.0-0.02, especially maximum 0.005, Zirconium (Zr) >0.0-0.05, especially maximum 0.01, 0-0.05 reactive element(s), especially Yttrium (Y), Cerium (Ce), Dysprosium (Dy), and/or Lanthanum (La).

30. The Alloy according to claim 29, which comprises no Cobalt (Co).

31. The Alloy according to claim 29, which comprises at least 1 wt % Cobalt (Co), especially at least 2.5 wt % cobalt (Co).

32. The Alloy according to claim 29, which comprises at least 0.005 wt % Boron (B).

33. The Alloy according to claim 29, which comprises maximum 0.02 wt % Boron (B), especially maximum 0.015 wt % Boron (B), very especially maximum 0.005 wt % Boron (B).

34. The Alloy according to claim 29, which contains no boron (B).

35. The Alloy according to claim 29, which comprises at least 0.005 wt % Zirconium (Zr).

36. The Alloy according to claim 29, which comprises at least 0.005% Carbon (C), especially at least 0.03% Carbon (C).

37. The Alloy according to claim 29, which comprises maximum 0.1% Carbon (C), especially maximum 0.07% Carbon (C), very especially maximum 0.03% Carbon (C).

38. The Alloy according to claim 29, wherein the alloy comprises: Ni-3Co-4Fe-12.5Cr-1.5Mo-3.5W-5.6Al-6Ta-1.5Hf-0.07C-0.015B-0.01Zr.

39. The Alloy according to claim 29, wherein the alloy comprises: Ni-3Co-4Fe-12.5Cr-1.3Mo-3W-5.4Al-6.5Ta-1.5Hf-0.25Si.

40. The Alloy according to claim 29, wherein the alloy comprises no Silicon (Si).

41. The Alloy according to claim 29, wherein the alloy comprises no Carbon (C), no Boron (B) and/or no Zirconium (Zr).

42. The Alloy according to claim 29, wherein the alloy comprises Silicon (Si).

43. The Alloy according to claim 29, wherein the alloy comprises Carbon (C), Boron (B) and/or Zirconium (Zr).

44. A component, especially which is a component for a gas turbine, which is made of an alloy according to claim 29,

45. The component according to claim 44, which has a columnar structure (DS) or which has a single crystal structure (SX).

46. The component according to claim 44, which has a polycrystalline structure (CC).

Description

DETAILED DESCRIPTION OF INVENTION

[0031] The inventive alloy comprises (in wt %):

TABLE-US-00001 Cobalt (Co) 0.0-5.0, especially until 4.0, Iron (Fe) 1.5-6.5, especially 2.5-4.5, Chromium (Cr) 12.0-14.0, Molybdenum (Mo) 1.0-2.0, especially 1.1-1.6, Wolfram (W) 2.0-5.0, especially 2.5-4.0, Aluminum (Al) 5.2-5.8, Tantalum (Ta) 5.0-7.0, especially 6.0-7.0, Hafnium (Hf) 1.2-1.8, optionally Carbon (C) 0.005-0.1, Silicon (Si) 0.005-0.4, Boron (B) .sup.>0-0.02, especially 0.005-0.02, Zirconium (Zr) .sup.>0-0.05, especially 0.005-0.05, 0.0-0.05 reactive element(s), especially Cerium (Ce), Yttrium (Y), Lanthanum (La), and/or Dysprosium (Dy), Ni based.

[0032] A large blade has a weight larger than 1.0 kg, especially heavier than 1.5 kg.

[0033] A small blade has a weight smaller than 1.0 kg, especially smaller than 0.8 kg.

[0034] For small or large blades both in a SX structure the alloy comprises 0.1 wt %-0.4 wt % Silicon (Si).

[0035] For small and large blades in a CC or DS structure the alloy comprises especially 0.005 wt %-0.015 wt % Silicon (Si).

[0036] For small blades in a SX structure the alloy comprises especially 0.005 wt %-0.03 wt % Carbon (C).

[0037] For large blades in a SX structure the alloy comprises especially 0.03 wt %-0.07 wt % Carbon (C).

[0038] For small and large blades in a CC or DS structure the alloy comprises especially 0.03 wt %-0.1 wt % Carbon (C).

[0039] For small blades in a SX structure the alloy comprises especially maximum 0.005 wt % Boron (B).

[0040] For large blades in a SX structure the alloy comprises especially 0.005 wt %-0.015 wt % Boron (B).

[0041] For small and large blades in a CC or DS structure the alloy comprises 0.005 wt %-0.02 wt % Boron (B).

[0042] For small and large blades in a CC or DS structure the alloy comprises 0.005 wt %-0.05 wt % Zirconium (Zr).

[0043] For small or large blades in a SX structure the alloy comprises maximum 0.01 wt % Zirconium (Zr).