US2025137099A1PendingUtilityA1
Forgeable gamma-prime strenghtened superalloy with high mechanical strength
Est. expiryOct 26, 2043(~17.3 yrs left)· nominal 20-yr term from priority
Inventors:Lee Pike
C22C 19/05C22C 19/055C22C 19/056C22F 1/10
70
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Claims
Abstract
Wrought age-hardenable nickel-chromium-cobalt based alloy compositions suitable for use in high temperature gas turbine cases possessing higher mechanical strength, toughness/containment, and thermal stability compared to current commercial alloys and an acceptable containment factor containing in weight percent 16 to 20 wt. % chromium, 8 to 13 wt. % cobalt, 4 to 8.5 wt. % molybdenum, up to 8 wt. % tungsten, 2.1 to 4.1 wt. % aluminum, titanium up to 1.9 wt. %, up to 3.7 wt. % niobium, up to 5 wt. % iron, carbon present up to 0.15 wt. %, up to 0.015 wt. % boron, up to 7.1 wt. % tantalum, up to 0.13 wt. % silicon, up to 1.0 wt. % manganese, and up to 0.06 wt. % zirconium, with a balance of nickel and impurities. The amounts of certain alloying elements must be carefully controlled according to three compositional relationships here disclosed.
Claims
exact text as granted — not AI-modifiedI claim:
1 . A nickel-chromium-cobalt based alloy having a composition comprised in weight percent of:
16 to 20
chromium
8 to 13
cobalt
4 to 8.5
molybdenum
up to 8
tungsten
up to 5
iron
2.1 to 4.1
aluminum
up to 1.9
titanium
up to 7.1
tantalum
up to 3.7
niobium
present up to 0.15
carbon
with a balance of nickel and impurities, the alloy further satisfying the following compositional relationships defined with elemental quantities being in terms of weight percent:
T
=
Al
+
0
.
5
6
T
i
+
0
.
2
9
N
b
+
0
.
1
5
Ta
R
=
A
l
/
T
;
0.7
≤
R
≤
1
G
=
T
-
1
.
6
7
R
;
1.8
<
G
<
2.4
Z
=
Mo
+
0.52
W
;
7
.
5
<
Z
<
9
.
5
.
2 . The nickel-chromium-cobalt based alloy of claim 1 , wherein the alloy contains in weight percent:
up to 1.0
titanium
up to 2.5
tantalum
up to 2.7
niobium.
3 . The nickel-chromium-cobalt based alloy of claim 1 , wherein the alloy contains in weight percent:
3.1 to 4.1
aluminum
up to 0.4
titanium
up to 2.5
tantalum
up to 1.3
niobium
the alloy further satisfying the following compositional relationships defined with elemental quantities being in terms of weight percent:
T
=
Al
+
0
.
5
6
T
i
+
0
.
2
9
N
b
+
0
.
1
5
Ta
R
=
Al
/
T
;
0.9
≤
R
≤
1
G
=
T
-
1.67
R
;
1.8
<
G
<
2.4
Z
=
Mo
+
0.52
W
;
7
.
5
<
Z
<
9
.
5
.
4 . The nickel-chromium-cobalt based alloy of claim 1 , also comprising in weight percent:
up to 0.13
silicon
up to 1
manganese
up to 0.06
zirconium.
5 . The nickel-chromium-cobalt based alloy of claim 4 , wherein the alloy contains in weight percent:
present up to 0.1
carbon
up to 0.008
boron
up to 0.12
silicon
up to 0.03
zirconium.
6 . The nickel-chromium-cobalt based alloy of claim 1 , wherein the alloy contains 8.5 to 11.5 weight percent cobalt.
7 . The nickel-chromium-cobalt based alloy of claim 1 wherein iron is at least 1.5 weight percent.
8 . The nickel-chromium-cobalt based alloy of claim 1 wherein titanium is less than 0.1 weight percent.
9 . The nickel-chromium-cobalt based alloy of claim 1 , wherein the alloy contains in weight percent:
16 to 20
chromium
9 to 11
cobalt
4.5 to 8
molybdenum
1 to 6
tungsten
1.5 to 4
iron
3.1 to 4.1
aluminum
up to 0.4
titanium
up to 1
tantalum
up to 1
niobium
present up to 0.08
carbon
up to 0.008
boron
the alloy further satisfying the following compositional relationships defined with elemental quantities being in terms of weight percent:
T
=
Al
+
0
.
5
6
T
i
+
0
.
2
9
N
b
+
0
.
1
5
Ta
R
=
Al
/
T
,
0.95
≤
R
≤
1
G
=
T
-
1
.
6
7
R
,
1.9
<
G
<
2.4
Z
=
Mo
+
0.52
W
,
7.5
<
Z
<
9
.
5
.
10 . The nickel-chromium-cobalt based alloy of claim 9 also comprising in weight percent:
less than 0.1
silicon
less than 0.02
zirconium.
11 . The nickel-chromium-cobalt based alloy of claim 9 wherein tungsten is greater than 2 weight percent.
12 . The nickel-chromium-cobalt based alloy of claim 9 wherein titanium is less than 0.1 weight percent.
13 . The nickel-chromium-cobalt based alloy of claim 1 also comprising in weight percent:
up to 0.05
magnesium
up to 0.05
calcium
up to 0.05
yttrium
up to 0.05
lanthanum
up to 0.05
cerium
up to 0.5
hafnium.
14 . The nickel-chromium-cobalt based alloy of claim 1 wherein the impurities comprise:
up to 0.5
copper
up to 0.5
vanadium
up to 0.015
sulfur
up to 0.03
phosphorus.
15 . The nickel-chromium-cobalt based alloy of claim 1 , wherein the alloy contains in weight percent:
16.80 to 19.46
chromium
9.28 to 10.31
cobalt
5.50 to 8.41
molybdenum
up to 5.18
tungsten
0.89 to 4.49
iron
3.0 to 3.90
aluminum
up to 0.5
titanium
up to 2.01
tantalum
up to 2.2
niobium
0.048 to 0.081
carbon
0.003 to 0.006
boron.
16 . The nickel-chromium-cobalt based alloy of claim 1 , also containing at least one element selected from the group consisting of magnesium, calcium, yttrium, cerium, and lanthanum, wherein each said element present comprises up to 0.05 weight percent of the alloy.
17 . The nickel-chromium-cobalt based alloy of claim 1 wherein the alloy contains in weight percent
16 to 20
chromium
8.5 to 11.5
cobalt
4 to 8.5
molybdenum
up to 8
tungsten
up to 5
iron
3.1 to 4.1
aluminum
up to 0.4
titanium
up to 2.5
tantalum
up to 1.3
niobium
present up to 0.15
carbon
with a balance of nickel and impurities, the alloy further satisfying the following compositional relationships defined with elemental quantities being in terms of weight percent:
T
=
Al
+
0
.
5
6
T
i
+
0
.
2
9
N
b
+
0
.
1
5
Ta
R
=
Al
/
T
;
0.9
≤
R
≤
1
G
=
T
-
1
.
6
7
R
;
1
.
8
<
G
<
2.4
Z
=
Mo
+
0.52
W
;
7
.
5
<
Z
<
9
.
5
.
18 . The nickel-chromium-cobalt based alloy of claim 1 wherein the alloy is in a form selected from the group consisting of wrought form, cast form, spray-formed and powder metallurgy form.
19 . The nickel-chromium-cobalt based alloy of claim 1 , wherein the alloy is in a wrought form selected from the group consisting of sheets, plates, bars, wires, tubes, pipes, and forgings.
20 . The nickel-chromium-cobalt based alloy of claim 1 wherein the alloy is formed as a component for a gas turbine engine case.Join the waitlist — get patent alerts
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