# US 10,309,229 B2 · Nickel based alloy composition

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- Number: US 10,309,229 B2
- Document ID: US10309229B2
- Status: Granted
- Kind: B2
- Application number: 14/577,422
- Filed: 2014-12-19
- Published: 2015-07-09
- Granted: 2019-06-04
- Earliest claimed: 2014-01-09
- Assignees: ROLLS-ROYCE plc
- Applicants: Rolls-Royce PLC
- Inventors: Roger Reed; David Crudden; Babak Raeisinia; Mark Christopher Hardy
- Web page: https://patentgrep.com/patent/US10309229B2

## CPC

- F01D 5/28: Selecting particular materials; {Particular measures relating thereto;} Measures against erosion or corrosion
- C22C 19/056: {with the maximum Cr content being at least 10% but less than 20%}
- C22C 30/00: Alloys containing less than 50% by weight of each constituent
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

A nickel based alloy composition including, by atomic per cent, between 12 and 15% of elements from the group of aluminium, titanium, tantalum and niobium, between 0.8 and 1.8% tungsten, between 5 and 8% aluminium, at least 28% of elements from the group of molybdenum, tungsten, chromium and cobalt, wherein the atomic ratio of the sum of titanium, tantalum and niobium to aluminium is between 0.6 and 1.1, and wherein the composition includes less than 1.5% molybdenum, the balance being nickel save for incidental impurities.

## Claims

### Claim 1

An alloy composition comprising, in atomic percent, between 12 and 17.3% chromium, between 13.7 and 18.3% cobalt, between 0.8 and 1.8% tungsten, between 5.8 and 8.2% aluminium, between 2.7 and 6.2% titanium, between 0.4 and 1.7% tantalum, up to 2.1% niobium, between 0.05 and 0.3% carbon, between 0.05% and 0.25% boron, between 0.02 and 0.06 zirconium, up to 1.5% molybdenum, up to 0.2% hafnium, up to 4% iron, up to 1% silicon and up to 0.65% manganese, the balance being nickel save for incidental impurities; wherein the alloy has a γ′ fraction of between about 50% and about 60%.

### Claim 2 (depends on 1)

An alloy composition according to claim 1 comprising, in atomic percent, substantially 15% chromium, substantially 16% cobalt, substantially 7% aluminium, substantially 3.7% titanium, substantially 0.5% tantalum, substantially 1% tungsten, substantially 1.3% niobium, substantially 0.08% boron, substantially 0.13% carbon, substantially 0.04% zirconium, the balance being nickel save for incidental impurities.

### Claim 3 (depends on 1)

An alloy composition according to claim 1 comprising, in atomic percent, substantially 16% chromium, substantially 14% cobalt, substantially 8% aluminium, substantially 3.7% titanium, substantially 0.5% tantalum, substantially 0.8% tungsten, substantially 1.3% niobium, substantially 0.08% boron, substantially 0.13% carbon, substantially 0.04% zirconium, the balance being nickel save for incidental impurities.

### Claim 4 (depends on 1)

An alloy composition according to claim 1 comprising, in atomic percent, substantially 12% chromium, substantially 17% cobalt, substantially 8% aluminium, substantially 4% titanium, substantially 1% tantalum, substantially 1.5% tungsten, substantially 1% niobium, substantially 0.08% boron, substantially 0.13% carbon, substantially 0.04% zirconium, the balance being nickel save for incidental impurities.

### Claim 5 (depends on 1)

An alloy composition according to claim 1 comprising, in atomic percent, substantially 16% chromium, substantially 16% cobalt, substantially 6% aluminium, substantially 3% titanium, substantially 1% tantalum, substantially 0.8% tungsten, substantially 2% niobium, substantially 0.08% boron, substantially 0.13% carbon, substantially 0.04% zirconium, the balance being nickel save for incidental impurities.

### Claim 6 (depends on 1)

An alloy composition according to claim 1 comprising, in atomic percent, substantially 16% chromium, substantially 14% cobalt, substantially 6% aluminium, substantially 5.5% titanium, substantially 0.5% tantalum, substantially 1% tungsten, substantially 0.5% niobium, substantially 0.08% boron, substantially 0.13% carbon, substantially 0.04% zirconium, the balance being nickel save for incidental impurities.

### Claim 7 (depends on 1)

An alloy composition according to claim 1 comprising, in atomic percent, substantially 14% chromium, substantially 14% cobalt, substantially 7.4% aluminium, substantially 3.25% titanium, substantially 1.2% tantalum, substantially 0.85% molybdenum, substantially 1.4% tungsten, substantially 0.9% niobium, substantially 0.135% boron, substantially 0.245% carbon, substantially 0.036% zirconium, the balance being nickel save for incidental impurities.

### Claim 8 (depends on 1)

An alloy composition according to claim 1 comprising, in atomic percent, substantially 15.2% chromium, substantially 14% cobalt, substantially 7.1% aluminium, substantially 3.8% titanium, substantially 1.2% tantalum, substantially 0.8% molybdenum, substantially 1.7% tungsten, substantially 1.0% niobium, substantially 0.135% boron, substantially 0.245% carbon, substantially 0.036% zirconium, the balance being nickel save for incidental impurities.

### Claim 9 (depends on 1)

An alloy composition according to claim 1 having an Mdγ value less than 0.88, where
Md
γ
=
∑
i
=
1
n
⁢
x
i
⁡
(
Md
)
i
and where xi is the atomic fraction of element i in the gamma matrix; Mdi is the parameter representing an average energy level of d orbitals of the alloying element i; and n is the number of elements in the gamma matrix.

### Claim 10 (depends on 1)

A rotor disk for a gas turbine engine formed of an alloy according to claim 1.

### Claim 11 (depends on 1)

An alloy composition according to claim 1 consisting essentially of, in atomic percent, between 12 and 17.3% chromium, between 13.7 and 18.3% cobalt, between 0.8 and 1.8% tungsten, between 5.8 and 8.2% aluminium, between 2.7 and 6.2% titanium, between 0.4 and 1.7% tantalum, up to 2.1% niobium, between 0.05 and 0.3% carbon, between 0.05% and 0.25% boron, between 0.02 and 0.06 zirconium, up to 1.5% molybdenum, up to 0.2% hafnium, up to 4% iron, up to 1% silicon and up to 0.65% manganese, the balance being nickel save for incidental impurities;
wherein a (Ti+Ta+Nb)/Al ratio is between 0.6 and 1.1.

### Claim 12

An alloy composition comprising, in atomic percent, substantially 15.2% chromium, substantially 14% cobalt, substantially 7.1% aluminium, substantially 3.5% titanium, substantially 1.6% tantalum, substantially 0.8% molybdenum, substantially 1.7% tungsten, substantially 1.0% niobium, substantially 0.135% boron, substantially 0.245% carbon, substantially 0.036% zirconium, substantially 1.0% iron, the balance being nickel save for incidental impurities.

### Claim 13

An alloy composition comprising, in atomic percent, substantially 14.0% chromium, substantially 15.0% cobalt, substantially 7.0% aluminium, substantially 3.5% titanium, substantially 1.6% tantalum, substantially 1.3% molybdenum, substantially 1.0% tungsten, substantially 0.9% niobium, substantially 0.136% boron, substantially 0.147% carbon, substantially 0.036% zirconium, substantially 1.0% iron, substantially 0.94% silicon, substantially 0.59% manganese the balance being nickel save for incidental impurities.

### Claim 14

An alloy composition comprising, in atomic percent, substantially 14.1% chromium, substantially 16.5% cobalt, substantially 7.0% aluminium, substantially 3.5% titanium, substantially 1.6% tantalum, substantially 1.4% molybdenum, substantially 1.1% tungsten, substantially 0.9% niobium, substantially 0.109% boron, substantially 0.147% carbon, substantially 0.058% zirconium, substantially 1.0% iron, substantially 0.53% silicon, substantially 0.59% manganese the balance being nickel save for incidental impurities.