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Патент USA US3026209

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United States Patent O??ce
3,026,199
Patented Mar. 20, 1962
1
2
3,026,199
certain formulations improve various metallurgical char
acteristics of the alloy. Additional amounts of these
Rudolf H. Thielemann, Palo Alto, Calif., assignor to
Sierra Metals Corporation, Chicago, 111., a corporation
ingredients may in some cases be tolerated in- the alloy
without deleterious effects.
If the boron content of the alloy exceeds about 0.2
METAL ALLOY
of Delaware
percent, then the alloy of this invention becomes unsatis
No Drawing. Filed July 28, 1958, Ser. No. 751,160
factory, particularly in those applications where thermal
6 Claims.. (Cl. 75-—171)
shock requirements are important.
An alloy having the above composition is both resistant
This invention relates to a cobalt base metal alloy
which includes alloying metal additives which make the 10 to oxidation and has high strength at elevated tempera
resulting alloy corrosion resistant and of great mechani
tures, considerably in excess of 1500° F., so as to be
cal work strength at temperatures up to as high as
suitable for use in forming cast liners for retorts and
1800" F.
container vessels used in the chemical and metallurgical
Important features of the alloy of this invention are
industries, as well as other uses previously mentioned.
In order to assure that the optimum desired properties
that it may be cast, it is highly resistant to oxidation
will be obtained in the alloy, it is preferred that the fol
and otherv forms of corrosion at temperatures up to
about 1800" F., and possesses great mechanical work
strength at temperatures up to between about 1500° F.
and about 1800“ F. As a result, this alloy may be used
in the fabrication of blades, vanes, and other parts for
high temperature gas turbine engines. Other important
uses of the alloy of this invention are in exhaust valves
lowing impurities in the alloy be held to the following
limits, by weight. The manganese content in the ?nal
alloy should be no more than about 2 percent. _ The
interstitial elements such as nitrogen, hydrogen, tin, lead
and the like should be kept as low as possible. In addi
tion, not more than about 0.5 percent total of deoxidizers
such as calcium, magnesium and the like should be
and manifolds in internal combustion engines, in heat
exchangers and in linings for retorts and container vessels
present in the ?nal alloy.
The following are examples of the proportions and
used in the chemical and metallurgical industries. It may 25
also be utilized in high temperature, high strength, cor
test results of the cobalt base metal alloy of this inven
rosion resistant tubing and sheet material.
tion.
Example 1
The prior ‘art nickel and/ or cobalt base metal alloys
which, for example, have been used as blades, vanes,
A 5 pound alloy melt of a cobalt base metal alloy
and other parts of high temperature gas turbine engines 30 composition containing about 25 percent of chromium;
have a maximum operating temperature of about 1500“
about 15 percent of tungsten; ‘about 2 percent of
F. For example, a common nickel-cobalt base metal
columbium;
about 0.75 percent of carbon; about 0.1 per
alloy which incorporates molybdenum as a constituent is
cent of zirconium; about 0.02 percent of boron; about 5
for all practical purposes non-utilizable vas a structural
percent of iron; and the balance, substantially all cobalt,
member in a gas turbine engine if the temperature is 35 all by weight, was prepared by melting a chromium co
above 1500“ F. One reason for this temperature limita
balt mix in a magnesia crucible under high vacuum con
tion is that the oxidation resistance of such an alloy fails
ditions, following. which the remaining constituents, in
when the alloy is raised to a temperature above 1500" F.
cluding carbon in the form of graphite, were added._' A
The alloy of this invention can be successfully used
cluster of 6 test bars were formed from the 5 pound
in blades or vanes in high temperature gas turbine engines, 40 melted alloy heated by the usual investment casting tech
which engines can be operated at markedly higher tem
nique under high vacuum conditions. These bars were
peratures than was possible heretofore due to the high
each 3 inches long and 1%; inch in diameter.
temperature characteristics of the alloy. This results in
The test bars had an elongation of 1.66 percent at
improvements in the performance of gas turbine engines,
room temperature under a tensile stress of 138,200 p.s.i..
since at higher temperatures the total thrust of a gas
The test bars of this example had a rupture life in ex
turbine engine increases and the amount of fuel con
cess of 31 hours under a load of 17,000 p.s.i. at a tem
sumed, per pound of thrust, decreases.
perature of 1800° F. in air; and a rupture life in excess
The metal alloy of this invention is comprised, by
of 19 hours under a load of 8000 p.s.i. at a temperature
weight, of approximately: 15 to 30 percent of chromium;
of 2000° F. in air.
,
from 5 to 15 percent of tungsten; 0.5 to 5 percent of 50
The oxidation penetration was measured in the con
columbium; from 0.01 to 3 percent of zirconium; from
ventional manner and was determined to be 0.04 mil per
0.1 to 1.3 percent of carbon; and the balance being es
side per hour after 100 hours at 2000° F. in moving air,
sentially cobalt.
and 0.03 mil per side per hour after 24 hours at 2100° F.
Tantalum may be present in the alloy in an amount
in moving air.
Example 2
such that if the columbium is present in the alloy in
an amount of more than 3 percent, then the combined
A 5 pound alloy melt and test bars of the same dimen
amount of columbium and tantalum should be equal to
sions as set forth in Example 1 of a cobalt base metal
or less than 20 percent by weight of the alloy; and if
alloy composition containing about 25 percent of chro
the columbium is present in the alloy in an amount
equal to or less than 3 percent, then the tantalum in 60 mium; about 15 percent of tungsten; about 0.1 percent
the alloy should never exceed twice the amount of
of zirconium; about 2 percent of columbium; about 0.75
'
percent of carbon; about 0.02 percent of boron; and the
vention without deleteriously affecting the properties of
the alloy provided that the amount of molybdenum in
in the same manner as set forth in Example 1.
I The test bars of this example had an elongation of
0.84 percent at room temperature under a tensile stress
columbium in the alloy.
Molybdenum may be tolerated in the alloy of this in
the alloy is not more than one-half of the amount of
tungsten in the alloy, and in any event is no greater than
3.5 percent by weight of the alloy.
balance, essentially cobalt, all by weight, were prepared
of 122,000 p.s.i.
The test bars of this example had a rupture life in
excess of 32 hours under a load of 17,000 p.s.i. at a
one or more of the following ingredients: up to about 70 temperature of about 1800° F. in air and a rupture life
in excess of 17 hours under a load of 8000 p.s.i. at a
0.2 percent of boron, up to about 1.5 percent of silicon,
and up to about 5 percent of nickel and/or iron may in
temperature of about 2000° F. in air.
'
It has been further found that the inclusion of any
3,026,199
4
Example 7
The oxidation penetration was 0.19 mil per side per
hour after 24 hours at 2100° F. vin moving air.
A 5 pound alloy melt and test bars of the same dimen
Example 3
sions as set forth in Example 1 of a cobalt base metal
alloy composition containing about 20 percent of chro
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in Example 1 of a cobalt base metal
mium; about 11 percent of tungsten; about 4 percent of
columbium; about 0.2 percent of zirconium; about 0.3
percent of carbon; and the balance, essentially cobalt,
alloy composition containing about 20 percent of chro
mium; about 11 percent of tungsten; about 1.5 percent
of zirconium; about 0.5 percent of columbium; about
all by weight, were prepared in the same manner as set
in Example 1.
0.4 percent of carbon; and the balance, essentially cobalt, 10 forth
The test bars of this example had an elongation of
all by weight, were prepared in the same manner as set
forth in Example 1.
7 percent at room temperature under a tensile stress of
115,000 p.s.i.
~>
.
The test bars of this example had an elongation of
The test bars. of this example had a rupture life in ex
cess of 100 hours under a load of 20,000 p.s.i. at a tem
15 perature of about 1700° F. in air and a rupture life in
The test bars of this example had a rupture life in
excess of 100 hours under a load of 15,000 p.s.i. at a
excess of 100 hours under a load of 20,000 p.s.i. at a
temperature of about 1800" F. in air.
temperature of about 1700° F. in air and a rupture life
Example 8
in excess of 100 hours under a load of 15,000 p.s.i. at
a temperature of about 1800“ F. in air.
7 percent at room temperature under a tensile stress of
115,000 p.s.i.
Example 4
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in Example 1 of a cobalt base metal
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in Example 1 of a cobalt base metal
mium; about 11 percent of tungsten; about 4 percent of
columbium; about 0.2 percent of zirconium; about 0.75
alloy composition containing about 20 percent of chro
alloy composition containing about 15 percent of chro 25 percent of carbon; and the balance, essentially cobalt, all
mium; about 15 percent of tungsten; about 1.5 percent
by weight, Were prepared in the same manner as set forth
of columbium; about 1.5 percent of zirconium; about 0.4
in Example 1.
percent of carbon; and the balance, essentially cobalt, all
The test bars of this example had an elongation of 7
by weight, were prepared in the same manner as set forth
in Example 1.
percent at room temperature under a tensile stress of
30
The test bars of this example had an elongation of
115,000 p.s.i.
The test bars of this example had a rupture life in
5 percent at room temperature under a tensile stress of
excess of 100 hours under a load of 20,000 p.s.i. at a
temperature of about 1700° F. in air and a rupture life
in excess of 100 hours under a load of 15,000 p.s.i. at a
98,000 p.s.i.
The test bars of this example had a rupture life in
excess of 100 hours under a load of 20,000 p.s.i. at a 35 temperature of about 1800° F. in air.
temperature of about 1700° F. in air and a rupture life
Example 9
in excess of 100 hours under a load of 15,000 p.s.i. at
a temperature of about 1800” F. in air.
Example 5
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in Example 1 of a cobalt base metal
alloy composition containing about 20 percent of chro
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in Example 1 of a cobalt base metal
40
alloy composition containing about 30 percent of chro
mium; about 5 percent of tungsten; about 1.5 percent of
columbium; about 1.5 percent of zirconium; about 0.4
percent of carbon; and the balance, essentially cobalt, all
by weight, were prepared in the same manner as set forth
mium; about 11 percent of tungsten; about 0.5 percent
of columbium; about 1.5 percent of zirconium; about 45 in Example 1.
0.4 percent of carbon; and the balance, essentially cobalt,
The test bars of this example had an elongation of 4
all by weight, were prepared in the same manner as set
percent at room temperature under a tensile stress of
forth in Example 1.
The test bars of this example had an elongation of
90,000 p.s.i.
The test bars of this example had a rupture life in
7 percent at room temperature under a tensile stress of 50 excess of 100 hours under a load of 25,000 p.s.i. at a
temperature of about 1600“ F. in air and a rupture life
115,000 p.s.i.
in excess of 100 hours under a load of 15,000 p.s.i. at a
' The test bars of this example had a rupture life in ex
temperature of about 1700° F. in air.
cess of 100 hours under a load of 20,000 p.s.i. at a
temperature of about 1700° F. in air and a rupture life
Example 10
in excess of 100- hours under a load of 15,000 p.s.i. at
A 5 pound alloy melt and test bars of the same dimen
a temperature of about 1800" F. in air.
sions as set forth in Example 1 of a cobalt base metal
Example 6
alloy composition containing about 20 percent of chro
mium; about 10.5 percent of tungsten; about 1.5 percent
sions as set forth in Example 1 of a cobalt base metal 60 of columbium; about 0.4 percent of zirconium; about 0.4
percent of carbon; and the balance, essentially cobalt, all
alloy composition containing about 20 percent of chro
by weight, were prepared in the same manner as set forth
mium; about 11 percent of tungsten; about 4 percent of
in Example 1.
columbium; about 0.2 percent of zirconium; about 0.1
The test bars of this example had an elongation of 7v
percent of carbon; and the balance, essentially cobalt,
A 5 pound alloy melt and test bars of the same dimen
all by weight, were prepared in‘ the same manner as set 65 percent at room temperature under a tensile stress of
forth in Example 1.
The test bars of this example had an elongation of
8 percent at room temperature under a tensile stress of
115,000 p.s.i.
The test bars of this example had a rupture life in
excess of 120 hours under a load of 25,000 p.s.i. at a
temperature of about 1600° F. in air; a rupture life of
70 1157 hours under a load of 20,000 p.s.i. at a temperature
The test bars of this example had a rupture life in
of about 1600° F. in air; a rupture life of 795 hours under
excess of 100 hours under a load of 15,000 p.s.i. at a
a load of 15,000 p.s.i. at a temperature of about 1700° F.
temperature of about 1700" F. in air and a rupture life
in air; and a rupture life in excess of 100 hours under a
in excess of 100 hours under a load of 10,000 p.s.i. at
load of 13,000 p.s.i. at a temperature of about 1800" F.
‘a temperature of about 1800° F. in air.
75 in arr.
95,000 p.s.i.
3,028,199
Example 11
‘The test bars of this example had a rupture life of
1100 hours under a load of 25,000 p.s.i. at a temperature
of about 1600° F. in air; and a rupture life in excess of
100 hours under a load of 14,000 p.s.i. at a temperature
alloy composition containing about 20 percent of chro
mium; about 10 percent of tungsten; about 0.75 percent 5 of about 1800" F. in air.
Example 15
of colurnbium; about 1.0 percent of tantalum; about 0.04
percent of zirconium; about 0.5 percent of carbon; and.
A 5 pound alloy melt and test bars of the same dimen
the balance, essentially cobalt, all by weight, were pre
sions as set forth in Example 1 of a cobalt base metal
pared in the same manner as set forth in Example 1.
alloy composition containing about 20 percent of chro
The test bars of this example had an elongation of 4.5 10 mium; about 10 percent of tungsten; about 1 percent of
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in Example 1 of a cobalt base metal
percent at room temperature under a tensile stress of
columbium; about 0.48 percent of zirconium; about 0.5
percent of carbon; and the balance, essentially cobalt, all
98,000 p.s.i.
The test bars of this example had a rupture life in
by weight, were prepared in the same manner as set forth
excess of 100 hours under a load of 25,000 p.s.i. at a 15 in Example 1.
temperature of about 1600’ F. in air; a rupture life in
The test bars of this example had an elongation of
excess of 100 hours under a load of 19,000 p.s.i. at a
9 percent at room temperature under a tensile stress of
temperature of about 1700° F. in air; and a rupture life
in excess of 100 hours under a load of 14,000 p.s.i. at a
temperature of about 1800“ F. in air.
97,000 p.s.i.
The test bars of this example had a rupture life in ex
cess of 100 hours under a load of 24,000 p.si. ‘at a tem
perature of about 1600“ F. in air; a rupture life in excess
of 100 hours under a load of 17,000 p.s.i. at a tempera
ture of about 1700° F. in air; and a rupture life in excess
of 100 hours under a load of 12,000 p.s.i. at a tempera~
Example 12
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in Example 1 of a cobalt base metal
alloy composition containing about 20 percent of chro
mium; about 10 percent of tungsten; about 0.75 percent
of colurn‘oium; about 1.0 percent of tantalum; about 0.04
percent of zirconium; about 0.5 percent of carbon; about
' ture of about 1800" F. in air.
Example 16
A 5 pound alloy melt and test bars of the same dimen
3.5 percent of molybdenum; and the balance, essentially
sions as set forth in Example 1 of a cobalt base metal
cobalt, all by weight, were prepared in the same manner 30 alloy composition containing ‘about 20 percent of chro
as set forth in Example 1.
mium; about 10 percent of tungsten; about 1 percent of
The test bars of this example had an elongation of
columbium; about 0.48 percent of zirconium; about 0.5
3.5 percent at room temperature under a tensile stress
percent of carbon; about 1.5 percent of silicon; and the
of 100,000 p.s.i.
balance, essentially cobalt, all by weight, were prepared
The test bars of this example had a rupture life in
excess of 100 hours under a load of 25,000 p.s.i. at a
in the same manner as set forth in Example 1.
temperature of about 1600° F. in air; a rupture life in
percent at room temperature under a tensile stress 0
The test bars of this example had an elongation of 2.5
excess of 100 hours under a load of 18,000 p.s.i. at a
97,000 p.s.i.
_
'
temperature of about 1700° F. in air; and a rupture life
The test bars of this example had a rupture life in
in excess of 100 hours under a load of 12,000 p.s.i. at a 40 excess of 100 hours under a load of 24,000 p.s.i. at a
temperature of about 1800” F. in air.
temperature of about 1600° F. in air; a rupture life in
Example 13
excess of 100 hours under a load of 18,000 p.s.i. at a
temperature of about 1700° F. in air; and a rupture life
A 5 pound alloy melt and test bars of the same dimen
in
excess of 100 hours under ‘a load of 10,000 p.s.i. at a
sions as set forth in Example 1 of a cobalt base metal alloy
temperature of about 1800“ F. in air.
composition containing about 20 percent of chromium;
'
about 7.5 percent of tungsten; about 1.5 percent of co
Example 17
lumbium; about 0.5 percent of carbon; about 2.5 percent
of tantalum; about 0.04 percent of zirconium; and the
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in Example 1 of a cobalt base metal
balance, essentially cobalt, all by weight, were prepared
in the same manner as set forth in Example 1.
The test bars or" this example had an elongation of 10
percent at room temperature under a tensile stress of
110,000 p.s.i.
The test bars of this example had a rupture life in
excess of 100 hours under a load of 25,000 p.s.i. at a
temperature of about 1600“ F. in air; a rupture life in
excess of 100 hours under a load of 20,000 p.s.i. at a
temperature of about 1700° F. in air; and a rupture life
in excess of 100 hours under a load of 15,000 p.s.i. at a
temperature of about 1800° F. in air.
_ Example 14
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in Example 1 of a cobalt base metal
alloy composition containing about 20 percent of chro
mium; about 7.5 percent of tungsten; about 1.5 percent
of columbium; about 2.5 percent of tantalum; about
0.04 percent of zirconium; about 0.50 percent of carbon;
50
alloy composition containing ‘about 20 percent of chro
mium; about 10 percent of tungsten; about 1.5 percent of
columbium; about 1 percent of zirconium; about 0.5 per
cent of carbon; and the balance, essentially cobalt, all by
weight, were prepared in the same manner as set forth
in Example 1.
The test bars of this example had an elongation of
4 percent at room temperature under a tensile stress of
117,000 p.s.i.
The test bars of this example had a rupture life in
60 excess of 100 hours under a load of 25,000 p.s.i. at a
temperature of about -l600° F. in air; a rupture life in
excess of 100 hours under a load of 20,000 p.s.i. at a
temperature of about 1700° F. in air; and a rupture life
in excess of 100 hours under a load of 15,000 p.s.i. ‘at a
temperature of ‘about 1800’ F. in air.
'
Example 18
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in Example 1 of a cobalt base metal
manner as set forth in Example 1.
alloy composition containing about 20 percent of chro
mium; about 10 percent of tungsten; about 1.5 percent of
columbium; about 1 percent of zirconium; about 0.5 per
The test bars of this example had an elongation of
8 percent at room temperature under a tensile stress of
ance, essentially cobalt, all by weight, were prepared in
about 1 percent of molybdenum; and the balance, essen
tially cobalt, all by weight, were prepared in the same
105,600 p.s.i.
cent of carbon; about 0.2 percent of boron; and the bal
75 the same manner as set forth in Example 1.
8,026,199
8
7
The test bars of this example had an elongation of
3 percent at room temperature under a tensile stress of
117,000 p.s.i.
The test bars of this example had a rupture life in ex
cess of 100 hours under -a load of 25,000 p.s.i. at a tem
perature of about 1600° F. in air; a rupture life in excess
of 100 hours under a load of 20,000 p.s.i. at a temperature
of about 1700° F. in air; and a rupture life in excess
alloy composition containing about 20 percent of chro
mium; about 10 percent of tungsten; about 5 percent of
columbium; about 0.01 percent of zirconium; about 0.65
percent of carbon; about 2.5 percent of iron; and the ‘bal
ance, essentially cobalt, all by “weight, were prepared in
the same manner as set forth in Example 1.
The test bars of this example had an elongation of 1
percent at room temperature under a tensile stress of
108,000 p.s.i.
of 100 hours under a load of 15,000 p.s.i. at a temperature
The test bars of this example had a rupture life in
10
of about 1800° F. in air.
excess of 100 hours under a load of 25,000 p.s.i. at a tem
Example 19
perature of about 1600° F. in air; a rupture life
A 5 pound alloy melt and test bars of the same dimen
in excess of 100 hours under a load of 20,000 p.s.i. at a
sions as set forth in Example 1 of a cobalt base metal
temperature of about 1700° F. in air; and a rupture life
alloy composition containing about 20 percent of chro 15 in excess of 100 hours under a load of 13,500 p.s.i. at a
mium; about 7.5 percent of tungsten; about 1.5 percent
temperature of about 1800“ F. in air.
of columbium; about 2.5 percent of tantalum; about 0.5
percent of zirconium; about 0.5 percent of carbon; about
0.1 percent of boron; and the balance, essentially cobalt,
Example 23
A 5 pound alloy melt and test bars of the same dimen
all by weight, were prepared in the same manner as set 20 sions as set forth in Example 1 of a cobalt base metal
97,000 p.s.i.
alloy composition containing about 20 percent of chro
mium; about 10 percent of tungsten; about 3.1 percent of
columbium; about 6.2 percent of tantalum; about 0.5 per
cent of zirconium; about 1.3 percent of carbon and the
excess of 100 hours under a load of 25,000 p.s.i. at a
in the same manner as set forth in Example 1.
forth in Example 1.
The test bars of this example had an elongation of
4 percent at room temperature under a tensile stress of
The test bars of this example had a rupture life in 25 balance, essentially cobalt, all by weight, were prepared
temperature of about 1600° F. in air; a rupture life in
The test bars of this example had an elongation of 0.6
excess of 100 hours under a load of 20,000 p.s.i. at a
percent at room temperature under a tensile stress of
temperature of about 1700° F. in air; and a rupture life
147,000 p.s.i.
in excess of 100 hours under a load of 15,000 p.s.i. at a 30
temperature of 1800" F. in air.
The test bars of this example had a rupture life in ex
cess of 100 hours under a load of 25,000 p.s.i. at a tem
perature of about 1600° F. in air; a rupture life in excess
of 100 hours under a load of 20,000 p.s.i. at a tempera
A 5 pound alloy melt and test bars of the same dimen
ture of about 1700° F. in air; and a rupture life in excess
sions as set forth in Example ’1 of a cobalt base metal 35 of 100 hours under a load of 15,00 p.s.i. at a temperature
of about 1800" F. in air.
alloy composition containing about 20 percent of chro
Example 20
mium; about 10 percent of tungsten; about 1.5 percent of
columbium; about 2.0 percent of zirconium; about ‘0.5
Example 24
percent of carbon; and the balance, essentially cobalt,
all by weight, were prepared in the same manner as set
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in vExample 1 of a cobalt base metal
forth in Example 1.
The test bars of this example had an elongation of
alloy composition containing about 20 percent ‘of chro
mium; about 7.5 percent of tungsten; about 1.5 percent
of columbium; about 2.5 percent of tantalum; about 0.5
percent of zirconium; about 0.6 percent of carbon; and
The test bars of this example had a rupture life in ex 45 the ‘balance, essentially cobalt, all by Weight, were pre
2 percent at room temperature under a tensile stress of
119,000 p.s.i.
pared in the same manner as set forth in Example 1.
cess of 100 hours under a load of 25,000 p.s.i. at a tem
The test bars of this example had an elongation of 3
perature of about 1600° F. in air; a rupture life in excess
percent at room temperature under a tensile stress of
of 100 hours under a load of 20,000 p.s.i. at a tempera
110,000 p.s.i.
ture of about 1700° F. in air; and a rupture life in excess
The test ‘bars of this example had a rupture life in
of 100 hours under a load of 15,000 p.s.i. at a temperature 50
excess of 100 hours under a load of 25,000 p.s.i. at a
of 1800° F. in air.
temperature of about 1600° F. in air; a rupture life in
Example 21
excess of 100 hours under a load of 20,000 p.s.i. at a
A 5 pound alloy melt and test bars of the same dimen
temperature of about 1700° F. in air; and a rupture life
sions as set forth in Example 1 of a cobalt base metal alloy
in
excess of 100 hours under a load of 10,000 p.s.i. at a
composition containing about 20 percent of chromium; 55 temperature of about 1800" F. in air.
about 10 percent of tungsten; about 1.5 percent of colum
Example 25
bium; about 2 percent of zirconium; about 0.5 percent
of carbon; about 0.2 percent of silicon; about 2.5 percent
A 5 pound alloy melt and test bars of the same dimen
of nickel; about 2.5 percent of iron; and the balance, es
sions as set forth in Example 1 of a cobalt base metal
60
sentially cobalt, all by weight, were prepared in the same
alloy composition containing about 20 percent of chro
manner as set forth in Example 1.
mium; about 7.5 percent of tungsten; about 1.5 percent
The test bars of this example had an elongation of 6.5
of columbium; about 2.5 percent of tantalum; about 0.5
percent at room temperature under a tensile stress of
percent of zirconium; about 0.8 percent of carbon; about
124,000 p.s.i.
1.0 percent of nickel; and the balance, essentially cobalt,
The test bars of this example had a rupture life in 65 all by weight, were prepared ‘in the same manner as set
excess of 100 hours under a load of 25,000 p.s.i. at a tem
forth in Example 1.
perature of about 1600° F. in air; a rupture life in excess
The test bars of this example had an elongation of 2.5
of 100 hours under a load of 20,000 p.s.i. at a temperature
percent at room temperature under a tensile stress of
of about 1700° F. in air; and a rupture life in excess of 100
122,000 p.s.i.
hours under a load of 15,000 p.s.i. at a temperature of 70
The test bars of this example had a rupture life in ex~
about 1800” F. in air.
cess of 100 hours under a ‘load of 20,000 p.s.i. at a tem
Example 22
perature of about 1700° F. in air; and a rupture life in
excess of 100 hours under a load of 15,000 p.s.i. at a
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in Example 1 of a cobalt base metal 75 temperature of about 1800° F. in air.
3,026,199
9
10
Example 26
conium; from about 0.1 to about 1.3 percent of carbon;
and the balance cobalt.
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in Example 1 of a cobalt base metal
4. A metal alloy consisting essentially of by weight:
from about 15 to about 30 percent of chromium; from
alloy composition containing about 20 percent of chro
mium; about 7.5 percent of tungsten; about 1.5 percent
of columbium; about 2.5 percent of tantalum; about 0.5
percent of zirconium; about 1.0 percent of carbon; and
the balance, essentially cobalt, all by weight, were pre
percent of boron; from about 0.5 to about 5 percent of
columbium; tantalum in an amount such that if the
ture of about 1700° F . in air; and a rupture life in excess
up to 3.5 percent of molybdenum, but not more than
about 5 to about 15 percent of tungsten; up to about 0.2
columbium is present in the alloy in an amount of more
than 3 percent then the combined amount of columbium
pared in the same manner as set forth in Example 1.
The test bars had an elongation of 2.5 percent at a 10 and tantalum in the alloy is less than or equal to 20 per
cent of the alloy; and if the columbium is in an amount
room temperature under a tensile stress of 115,000 p.s.i.
of equal to or less than 3 percent, the tantalum should
The test bars of this example had a rupture life in excess
not exceed twice the amount of columbium in the alloy;
of 100 hours under a load of 20,000 psi. at a tempera
of 100 hours under a load of 15,000 psi. at a tempera
ture of about 1800° F. in air.
Example 27
about 50 percent of the amount of tungsten in the alloy;
from about 0.01 to about 3 percent of zirconium; from
about 0.1 to about 1.3 percent of carbon; and the balance
cobalt.
5. A metal alloy consisting essentially of by weight:
A 5 pound alloy melt and test bars of the same dimen
sions as set forth in Example 1 of a cobalt base metal 20 from about 15 to about 30 percent of chromium; from
about 5 to about 15 percent of tungsten; from about 0.5
alloy composition containing about 20 percent of chromi
to about 5 percent of columbium; tantalum in an amount
um; about 7.5 percent of tungsten; about 1.5 percent of
such that if the columbium is present in the alloy in an
columbium; about 2.5 percent of tantalum; about 0.5
amount of more than 3 percent then the combined
percent of zirconium; about 1.3 percent of carbon; about
5 percent of nickel; and the balance, essentially cobalt, 25 amount of columbium and tantalum in the alloy is less
than or equal to 20 percent of the alloy; and if the
all by weight, were prepared in the same manner as set
forth in Example 1.
The test bars of this example had an elongation of 2
columbium is in an amount of equal to or less than 3
percent, the tantalum should not exceed twice the amount
of columbium in the alloy; from ‘about 0.01 to about 3
percent at room temperature under a tensile stress of
30 percent of zirconium; from about 0.1 to about 1.3 percent
98,000 p.s.i.
of carbon; up to about 1.5 percent of silicon; up to about
The test bars of this example had a rupture life in
5 percent of nickel; up to about 5 percent of iron; and the
excess of 100 hours under a load of 20,000 psi. at a
balance cobalt.
temperature of about 1700° F. in air; and a rupture life
6. A metal alloy consisting essentially of by weight:
in excess of 100 hours under a load of 15,000 psi. at a 35
from about 15 to about 30 percent of chromium; from
temperature of about 1800“ F. in air.
about 5 to about 15 percent of tungsten; up to about 0.2
The above detailed description of this invention has
been given for clearness of understanding only. No un
percent of boron; from about 0.5 to about 5 percent of
columbium; tantalum in an amount such that if the
necessary limitations should be understood therefrom, as
modifications will be obvious to those skilled in the art. 40 columbium is present in the alloy in an amount of more
than 3 percent then the combined amount of columbium
I claim:
and tantalum in the alloy is less than or equal to 20 per
1. A metal alloy consisting essentially of by weight:
cent of the alloy; and if the columbium is in an amount
from about 15 to about 30 percent of chromium; from
of equal to or less than 3 percent, the tantalum should
about 5 to about 15 percent of tungsten; from ‘about 0.5
to about 5 percent of columbium; from about 0.01 to 45 not exceed twice the amount of columbium in the alloy;
up to 3.5 percent of molybdenum, but not more than
about 3 percent of zirconium; from about 0.1 to about
1.3 percent of carbon; and the balance cobalt.
2. A metal alloy consisting essentially of by weight:
from about 15 to about 30 percent of chromium; from
about 5 to about 15 percent of tungsten; from about 0.5
to about 5 percent of columbium, tantalum in an amount
such that if the columbium is present in the alloy in an
amount of more than 3 percent then the combined
amount of columbium and tantalum in the alloy is equal
to or less than 20 percent of the alloy; and if the colum 55
bium is in an amount equal to or less than 3 percent,
then the tantalum should not exceed twice the amount
of columbium in the alloy; from about 0.01 to about 3
percent of zirconium; from about 0.1 to about 1.3 percent
60
of carbon; and the balance cobalt.
3. A metal alloy consisting essentially of by weight:
from about 15 to about 30 percent of chromium, from
about 5 to about 15 percent of tungsten; up to about 0.2
percent of boron; from about 0.5 to about 5 percent of
columbium; horn about 0.01 to about 3 percent of zir- 6
about 50 percent of the amount of tungsten in the alloy;
from about 0.01 to about 3 percent of zirconium; from
about 0.1 to about 1.3 percent of carbon; up to about 1.5
percent of silicon; up to about 5 percent of nickel; up to
about 5 percent of iron; and the balance cobalt.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,247,643
Rohn et a1 ____ _.‘_. _______ __ July 1, 1941
2,515,774
2,684,299
Johnson _____________ __ July 18, 1950
Binder _______________ __ July 20, 1954
443,821
686,180
542,813
Great Britain __________ __ Mar. 6, 1936
Great Britain _________ __ Jan. 21, 1953
Canada _____________ __ June 25, 1957
FOREIGN PATENTS
OTHER REFERENCES
Materials and Methods, September 1953; Number 260,
page 139.
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