Alloy for gas turbine applications with high oxidation resistance

Patent metadata

Field	Value
Publication number	US-2020318220-A1
Application number	US-201816759340-A
Country	US
Kind code	A1
Filing date	Oct 24, 2018
Priority date	Nov 24, 2017
Publication date	Oct 8, 2020
Grant date	—

Abstract

A nickel base super alloy or blade alloy having Ni as a main constituent and the following elements or portions in wt %: Fe: 2 to 8, Al: 6.1 to 6.8, Cr: 12.5 to 15, W: 1.5 to 4.5, Ta: 2.5 to 5.5, Hf: 1.2 to 2, C: 0.03 to 0.13, B: 0.005 to 0.02, Zr: 0.005 to 0.02, and Si: 0.005 to 0.02.

First claim

1 . Nickel A nickel base alloy comprising:
Ni as a main constituent, and the following portions in wt %:
Fe: 2 to 8,
Al: 6.1 to 6.8,
Cr: 12.5 to 15,
W: 1.5 to 4.5,
Ta: 2.5 to 5.5,
Hf: 1.2 to 2,
C: 0.03 to 0.13,
B: 0.005 to 0.02,
Zr: 0.005 to 0.02, and
Si: 0.005 to 0.02.

2 . The alloy according to claim 1 , comprising:
between 20 and 500 ppmw of one or more of reactive elements.

3 . The alloy according to claim 2 , comprising:
sulfur at a level below 5 ppmw.

4 . The alloy according to claim 1 , comprising:
1.5 to 3.5 wt % of W, 2.5 to 4.5 wt % of Ta, and 1.4 to 1.8 wt % of Hf.

5 . The alloy according to claim 1 , comprising
0.03 to 0.09 wt % of C, 0.005 to 0.015 wt % of B and 0.005 to 0.015 wt % of Zr.

6 . The alloy according to claim 1 , comprising:
5 to 7 wt % of Fe, 6.4 to 6.7 wt % of Al, and 13.5 to 14.5 wt % of Cr.

7 . The alloy according to claim 1 , comprising:
2 to 4 of Fe, 6.1 to 6.4 wt % of Al, and 13.5 to 14.5 wt % of Cr.

8 . The alloy according to claim 1 , comprising:
0.005 to 0.015 wt % of Si.

9 . The alloy according to claim 1 , comprising:
0.005 to 0.015 wt % of Ce, La, Y.

10 . The alloy according to claim 1 ,
wherein—aside from unavoidable impurities—the alloy is free of at least one of Co, Mo, Re, Ti and Nb.

11 . The alloy according to claim 1 ,
wherein the alloy is configured such that a solvus temperature is suppressed to or lies between 1140 C.° and 1165° C.

12 . The alloy according to claim 1 consisting of the following constituents:
Ni as a main constituent,
Fe: 2 to 8 wt %,
Cr: 12 to 15 wt %,
W: 1.5 to 4.5 wt %,
Al: 6.1 to 6.8 wt %,
Ta: 2.5 to 5.5 wt %,
Hf: 1.2 to 2 wt %,
C: 0.03 to 0.13 wt %,
B: 0.005 to 0.02 wt %,
Zr: 0.005 to 0.02 wt %,
Si: 0.005 to 0.02 wt %,
between 20 and 500 ppmw of one or more of Y, La, Ce, and
between 0.01 and 0.5 wt % of the sum of rare earths comprising Sc, Y, the actinides and the lanthanides.

13 . A powder material comprising:
an alloy according to claim 1 for the additive manufacture of a structure.

14 . A method of additive manufacturing a structure from an alloy base material according to claim 1 , the method comprising:
using laser metal deposition to additively manufacture the structure.

15 . A component comprising:
a structure manufactured by the method of claim 14 , wherein—as compared to the alloy “IN738LC”—the structure has an increased oxidation resistance, an increased strength, an increased thermal mechanical fatigue strength, an increased cracking resistance, and an increased hot cracking resistance.

16 . The alloy according to claim 2 ,
wherein the one or more of reactive elements comprises La, Ce and Y.

17 . The alloy according to claim 3 , comprising:
sulfur at a level below 2 ppmw.

18 . The alloy according to claim 4 , comprising:
2 wt % of W, 3 wt % of Ta, and 1.5 wt % of Hf.

19 . The alloy according to claim 5 , comprising:
0.05 to 0.07 wt % of C, 0.01 wt % of B and 0.01 wt % of Zr.

20 . The alloy according to claim 6 , comprising:
6 wt % of Fe, 6.5 wt % of Al, and 14 wt % of Cr.

21 . The alloy according to claim 7 , comprising:
3 wt % of Fe, 6.25 wt % of Al, and 14 wt % of Cr.

22 . The alloy according to claim 8 , comprising:
0.01 wt % of Si.

23 . The alloy according to claim 9 , comprising:
0.01 wt % of Ce, La, Y.

Assignees

• Siemens Ag

Inventors

• Hasselqvist Magnus

Classifications

• C22C19/056 Primary

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

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title

• C22C19/05 Primary

  with chromium · CPC title

• B22F10/25

  Direct deposition of metal particles, e.g. direct metal deposition [DMD] or laser engineered net shaping [LENS] · CPC title

• B22F10/36

  of energy beam parameters · CPC title