US2015275334A1PendingUtilityA1
Aluminium Oxide Forming Nickel Based Alloy
Assignee: SANDVIK INTELLECTUAL PROPERTYPriority: Nov 19, 2008Filed: Jun 9, 2015Published: Oct 1, 2015
Est. expiryNov 19, 2028(~2.3 yrs left)· nominal 20-yr term from priority
B22F 3/02C22C 19/058B22F 3/15Y10T428/12C22C 1/0433C22C 19/05
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Claims
Abstract
Nickel based alloy intended for use at high temperatures wherein it comprises in percent by weight (wt-%) C 0.05-0.2, Si max 1.5, Mn max 0.5, Cr 15-20, Al 4-6, Fe 15-25, Co max 10, N 0.03-0.15, O max 0.5, one or more elements selected from the group consisting of Ta, Zr, Hf, Ti and Nb 0.25-2.2, one or more elements selected from the group consisting of REM max 0.5, balance Ni, and normally occurring impurities.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . Dispersion strengthened nickel based alloy comprising in percent by weight (wt-%)
C
0.05-0.2
Si
max 1.5
Mn
max 0.5
Cr
15-20
Al
4-6
Fe
15-25
Co
max 10
N
0.03-0.15
O
max 0.5
one or more elements selected from
0.25-2.2
the group consisting of Ta, Zr, Hf, Ti and Nb
one or more elements selected from
max 0.5
the group consisting of REM
balance Ni and normally occurring impurities,
wherein the dispersion strengthened nickel based alloy includes dispersed particles having a composition that includes C or N and one or more elements selected from the group consisting of Ta, Zr, Hf, Ti and Nb, and wherein the dispersed particles have an average diameter of less than 0.5 μm.
2 . Nickel based alloy according to claim 1 , wherein the alloy comprises 16-21.5 wt-% Fe.
3 . Nickel based alloy according to claim 1 , wherein the alloy comprises 17-20 wt-% Cr.
4 . Nickel based alloy according to claim 1 , wherein the alloy comprises max 1 wt-% Si.
5 . Nickel based alloy according to claim 1 , wherein the alloy comprises one or more dements selected from the group consisting of REM in a total content of 0.05-0.25 wt-%.
6 . Nickel based alloy according claim 1 wherein the alloy comprises one or more elements selected from the group consisting of Ta, Zr, Hf, Ti and Nb in a total content of 0.3-1.5 wt-%.
7 . Nickel based alloy according to claim 1 wherein the alloy comprises 0.1-0.5 wt-% Hf.
8 . Nickel based alloy according claim 1 , wherein the alloy comprises 0.05-0.35 wt-% Zr.
9 . Nickel based alloy according to claim 1 , wherein the alloy comprises 0.05-0.5 wt-% Ta.
10 . Nickel based alloy according to claim 1 , wherein the alloy comprises 0.05-0.4 wt-% Ti.
11 . Nickel based alloy according claim 1 , wherein the alloy comprises 0.1-0.8 wt-% Nb.
12 . Nickel based alloy according to claim 1 , wherein the alloy comprises from greater than 4 to 5.5 wt-% Al.
13 . Nickel based alloy according to claim 1 , wherein the alloy comprises 200-2000 ppm O.
14 . Nickel based alloy according to claim 1 , wherein the alloy comprises 52-62 wt-% Ni.
15 . Nickel based alloy according to any claim 1 , wherein the alloy is essentially free from carbides having a composition of M 7 C 3 , wherein M is a metal.
16 . Powder of a dispersion strengthened nickel based alloy comprising in percent by weight (wt-%):
C
0.05-0.2
Si
max 1.5
Mn
max 0.5
Cr
15-20
Al
4-6
Fe
15-25
Co
max 10
N
0.03-0.15
O
max 0.5
one or more elements selected from
0.25-2.2
the group consisting of Ta, Zr, Hf, Ti and Nb
one or more elements selected from
max 0.5
the group consisting of REM
balance Ni and normally occurring impurities.
17 . Solid component comprising an aluminium oxide forming nickel based alloy wherein the nickel based alloy is compacted, such as by hot isostatic pressing or cold isostatic pressing, of a powder according to claim 16 .
18 . Use of the nickel based ahoy according to claim 1 , in products in the form of tube, rod, strip, plate or wire.
19 . Use of the nickel based alloy according to claim 1 , as construction material for heat treatment furnaces, in rollers for roller hearth furnaces, as muffle tubes for annealing in protective atmosphere, as construction material for heating elements, combustion chamber material in gas turbines, as gas-to-gas heat exchangers for example in the glass manufacturing industry or in gas turbines, as tubular reactors in high temperature processes, as transportation belts woven of wire intended for heat treatment furnaces, in radiation tubes for heating of heat treatment furnaces or as protection tubes for thermocouples.
20 . Nickel based alloy according to claim 1 , wherein the alloy includes dispersed particles having an average diameter of 50-200 nm.
21 . Nickel based alloy according to claim 1 , wherein more than 85% of the dispersed particles have a diameter of less than 300 nm.
22 . Nickel based alloy according to claim 1 , wherein, at room temperature, the alloy has a yield strength Rp 0.2 of 400 to 530 N/mm 2 , a yield strength Rp 1.0 of 510 to 600 N/mm 2 , a tensile strength R m of 815 to 1000 N/mm 2 , and an elongation to fracture of 31 to 37%, and wherein each of the yield strength Rp 0.2 , the yield strength Rp 1.0 , the tensile strength R m , and the elongation to fracture are an average of three samples.
23 . Nickel based alloy according to dam 22, wherein, at 500° C., the alloy has a yield strength Rp 0.2 of 375 to 465 N/mm 2 , a tensile strength R m of 815 to 890 N/mm 2 , and an elongation to fracture of 24 to 29%, and wherein each of the yield strength Rp 0.2 , the tensile strength R m , and the elongation to fracture are an average of three samples.
24 . Nickel based alloy according to claim 22 , wherein, at 600° C., the alloy has a yield strength Rp 0.2 of 430 to 575 N/mm 2 , a tensile strength R m of 815 to 850 N/mm 2 , and an elongation to fracture of 19 to 28%, and wherein each of the yield strength Rp 0.2 , the tensile strength R m , and the elongation to fracture are an average of three samples.
25 . Nickel based alloy according to claim 22 , wherein an impact strength of the alloy has an average value of 45 to 120 J.
26 . Dispersion strengthened nickel based alloy comprising in percent by weight (wt-%)
C
0.12-0.2
Si
0.04-0.08
Mn
0.06-0.10
Cr
17-19
Al
4.5-5.2
Fe
17-21
Co
0.02-0.35
N
0.00-0.10
O
0.02-0.04
Y
0.15-0.3
Ta + Zr + Hf
1.15 to 2.2
balance Ni and normally occurring impurities,
wherein the alloy has a time to rupture of at least 500 hours when measured by a creep test at 1200° C. with a 5 MPa load.
27 . Nickel based alloy according to claim 26 , wherein the alloy has a time to rupture of 500 to 4000 hours when measured by a creep test at 1200° C. with a 5 MPa load.
28 . Nickel based alloy according to claim 26 , wherein the alloy has a time to rupture of at least 4000 hours when measured by a creep test at 1200° C. with a 5 MPa load.
29 . Dispersion strengthened nickel based alloy manufactured by powder metallurgy techniques, the dispersion strengthened nickel based alloy comprising in percent by weight (wt-%)
C
0.12-0.2
Si
0.04-0.08
Mn
0.06-0.10
Cr
17-19
Al
4.5-5.2
Fe
17-21
Co
0.02-0.35
N
0.00-0.10
O
0.02-0.04
Y
0.15-0.3
Ta + Zr + Hf
1.15 to 2.2
balance Ni and normally occurring impurities,
wherein the alloy has a time to rupture of at least 500 hours when measured by a creep test at 1200° C. with a 5 MPa load.
30 . Nickel based alloy according to claim 29 , wherein the dispersion strengthened nickel based alloy includes dispersed particles and wherein more than 85% of the dispersed particles have a diameter of less than 300 nm
31 . Nickel based alloy according to claim 30 , wherein the dispersed particles have a composition that includes C or N and one or more elements selected from the group consisting of Ta, Zr, Hf, Ti and Nb.Join the waitlist — get patent alerts
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