US2023416877A1PendingUtilityA1
Super-heat-resistant alloy
Assignee: KOREA INSTITUTE MATERIALS SCIENCEPriority: Nov 9, 2020Filed: Nov 9, 2021Published: Dec 28, 2023
Est. expiryNov 9, 2040(~14.3 yrs left)· nominal 20-yr term from priority
C22C 19/057C22C 19/03C22C 30/00
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Claims
Abstract
Provided is a super-heat-resistant alloy consisting of aluminum (Al): 4.0 wt % to 5.2 wt %, cobalt (Co): 1.0 wt % to 10.0 wt %, chromium (Cr): 5.0 wt % to 8.0 wt %, molybdenum (Mo): 0.5 wt % to 2.0 wt %, tantalum (Ta): 7.0 wt % to 10.0 wt %, titanium (Ti): 0 wt %<Ti≤1.5 wt %, tungsten (W): 7.0 wt % to 10.5 wt %, and nickel (Ni): balance, and not containing rhenium (Re).
Claims
exact text as granted — not AI-modified1 . A super-heat-resistant alloy consisting of aluminum (Al): 4.0 wt % to wt %, cobalt (Co): 1.0 wt % to 10.0 wt %, chromium (Cr): 5.0 wt % to 8.0 wt %, molybdenum (Mo): 0.5 wt % to 2.0 wt %, tantalum (Ta): 7.0 wt % to 10.0 wt %, titanium (Ti): 0 wt %<Ti≤1.5 wt %, tungsten (W): 7.0 wt % to 10.5 wt %, and nickel (Ni): balance, and not containing rhenium (Re),
wherein a creep resistance sustainability of the super-heat-resistant alloy according to Equations 1 and 2 below is greater than or equal to 60%.
Stable creep resistance time (hours)= t max −t min <Equation 1>
in a period of time satisfying
[ε t(i) −ε t(i−1) ]/[t ( i )− t ( i− 1)]≤0.005(%/hours)
(where ε t(i) denotes a creep strain of the super-heat-resistant alloy at time t(i), ε t(i−1) denotes a creep strain of the super-heat-resistant alloy at time t(i−1), t max denotes a maximum time value in the period of time, and t min denotes is a minimum time value in the period of time.)
Creep resistance sustainability=[(Stable creep resistance time)/(Total CreepLife)×100] <Equation 2>
(where the stable creep resistance time and the total creep life are measured under conditions of 1100° C. and 137 MPa.)
2 . The super-heat-resistant alloy of claim 1 , wherein the time stable creep resistance time according to Equation 1 is 150 hours or more.
3 . A super-heat-resistant alloy consisting of aluminum (Al): 4.0 wt % to wt %, cobalt (Co): 1.0 wt % to 10.0 wt %, chromium (Cr): 5.0 wt % to 8.0 wt %, molybdenum (Mo): 0.5 wt % to 2.0 wt %, tantalum (Ta): 7.0 wt % to 10.0 wt %, titanium (Ti): 0 wt %<Ti≤1.5 wt %, tungsten (W): 7.0 wt % to 10.5 wt %, hafnium (Hf): 0 wt %<Hf≤1.5 wt %, and nickel (Ni): balance, and not containing rhenium (Re),
wherein a creep resistance sustainability of the super-heat-resistant alloy according to Equations 1 and 2 below is greater than or equal to 60%.
Stable creep resistance time (hours)= t max −t min <Equation 1>
in a period of time satisfying
[ε t(i) −ε t(i−1) ]/[t ( i )− t ( i− 1)]≤0.005(%/hours)
(where ε t(i) denotes a creep strain of the super-heat-resistant alloy at time t(i), ε t(i−1) denotes a creep strain of the super-heat-resistant alloy at time t(i−1), t max denotes a maximum time value in the period of time, and t min denotes is a minimum time value in the period of time.)
Creep resistance sustainability=[(Stable creep resistance time)/(Total CreepLife)×100] <Equation 2>
(where the stable creep resistance time and the total creep life are measured under conditions of 1100° C. and 137 MPa.)
4 . The super-heat-resistant alloy of claim 3 , wherein the stable creep resistance time according to Equation 1 is 150 hours or more.
5 . The super-heat-resistant alloy of claim 1 , wherein the super-heat-resistant alloy does not contain iron (Fe).
6 . The super-heat-resistant alloy of claim 1 , wherein a lattice misfit δ of the super-heat-resistant alloy according to Equation 3 below is higher than −0.35% and lower than −0.28%.
Lattice
Misfit
δ
=
2
×
α
γ
′
-
α
γ
α
γ′
+
α
γ
[
Equation
3
]
(where α γ denotes a lattice parameter of a matrix γ, and α γ′ denotes a lattice parameter of a precipitate γ′.)
7 . The super-heat-resistant alloy of claim 1 , wherein a γ lattice parameter distribution parameter of the super-heat-resistant alloy according to Equation 8 below is greater than 0.12.
γ
Lattice
Parameter
Distribution
Parameter
=
∑
i
(
k
i
×
x
i
×
V
i
γ
)
>
0
.
1
2
[
Equation
8
]
(where k i denotes a partitioning coefficient of each alloying element and indicates x i γ /x i γ′ , x i denotes an atomic fraction (at. %) of each alloying element, x i γ denotes an atomic fraction (at. %) of each alloying element in a matrix γ phase, x i γ′ denotes an atomic fraction (at. %) of each alloying element in a precipitate γ′ phase, and V i γ denotes a Vegard coefficient of each alloying element in the matrix γ phase.)Join the waitlist — get patent alerts
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