US2013167979A1PendingUtilityA1
Method of predicting quench cracking in components formed by high deformation processes
Est. expiryDec 29, 2031(~5.4 yrs left)· nominal 20-yr term from priority
F01D 5/02C21D 9/0068F01D 5/3007C21D 1/00F05D 2230/40C22C 19/03F05D 2230/25C22F 1/002F01D 5/34C22F 1/10
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Claims
Abstract
A process for heat treating a component formed of an alloy. The process includes manipulating uniaxial strain test data of the alloy using a triaxiality factor to determine an equivalent multiaxial stress state. Conditions are then applied to the multiaxial stress state to identify a cooling path for the component. The cooling path includes boundaries for heat treatment temperatures and cooling rates that do not exceed predetermined stresses or strains and/or avoid predetermined residual stress patterns in the alloy. The component is then heated to a heat treatment temperature and quenched according to the cooling path identified in the applying step.
Claims
exact text as granted — not AI-modified1 . A process of heat treating a component formed of an alloy, the process comprising:
manipulating uniaxial strain test data of the alloy using a triaxiality factor to determine an equivalent multiaxial stress state; applying conditions to the multiaxial stress state to identify a cooling path for the component, wherein the cooling path comprises boundaries for heat treatment temperatures and cooling rates that do not exceed predetermined stresses or strains and/or avoid predetermined residual stress patterns in the alloy; and then heating the component to a heat treatment temperature and quenching the component according to the cooling path identified in the applying step.
2 . The process of to claim 1 , wherein the alloy is a precipitation-strengthened alloy.
3 . The process of claim 2 , wherein the precipitation-strengthened alloy is a nickel-base alloy comprising gamma prime precipitates.
4 . The process of claim 2 , further comprising performing uniaxial strain tests on the alloy to obtain the uniaxial strain test data prior to the manipulating step.
5 . The process of to claim 2 , wherein the temperature of the heating step is a supersolvus temperature of the precipitation-strengthened alloy.
6 . The process according to claim 2 , wherein the precipitation-strengthened alloy has a gamma prime volume fraction of about 49% and above with a solvus temperature higher than about 1150° C.
7 . The process of to claim 1 , wherein portions of the component have different average grain sizes following the heating step.
8 . The process of claim 1 , further comprising calculating the triaxiality factor for the precipitation-strengthened alloy by inputting the uniaxial strain test data into the equation:
F
T
=
2
(
σ
1
+
σ
2
+
σ
3
)
(
σ
1
-
σ
2
)
2
+
(
σ
2
-
σ
3
)
2
+
(
σ
3
-
σ
1
)
2
prior to the manipulating step, wherein F T is the triaxiality factor and σ 1 , σ 2 , and σ 3 are principle stresses.
9 . The process of claim 1 , wherein the manipulating step comprises calculating equivalent strain at fracture for multi-axial loading by inputting the uniaxial strain test data and the triaxiality factor into the equation:
ɛ
f
=
Min
[
ɛ
u
F
T
;
ɛ
u
(
2
1
-
F
T
)
]
wherein F T is the triaxiality factor, ε u is the fracture strain for uniaxial loading, and ε f is the equivalent strain at fracture for multi-axial loading.
10 . The process according to claim 1 , wherein the component is a rotating component of a gas turbine engine.
11 . The process according to claim 10 , wherein the rotating component is a turbine disk.
12 . A process of heat treating a turbine disk of a gas turbine engine, the process comprising:
manipulating uniaxial strain test data on a precipitation-strengthened alloy using a triaxiality factor to determine an equivalent multiaxial stress state, wherein the turbine disk is formed of the precipitation-strengthened alloy; applying conditions to the multiaxial stress state to identify a cooling path for the turbine disk, wherein the cooling path comprises boundaries for heat treatment temperatures and cooling rates that do not exceed predetermined stresses or strains and/or avoid predetermined residual stress patterns in the precipitation-strengthened alloy; and then heating the turbine disk to a heat treatment temperature and quenching the turbine disk according to the cooling path identified in the applying step.
13 . The process of to claim 12 , wherein the precipitation-strengthened alloy is a nickel-base alloy comprising gamma prime precipitates.
14 . The process of to claim 12 , wherein the precipitation-strengthened alloy has a gamma prime volume fraction of about 49% and above with a solvus temperature higher than about 1150° C.
15 . The process of claim 12 , further comprising performing uniaxial strain tests on the alloy to obtain the uniaxial strain test data prior to the manipulating step.
16 . The process of to claim 12 , wherein the heat treatment temperature is a supersolvus temperature of the precipitation-strengthened alloy.
17 . The process of to claim 12 , wherein portions of the turbine disk have different average grain sizes following the heating step.
18 . The process of claim 12 , further comprising calculating the triaxiality factor for the precipitation-strengthened alloy by inputting the uniaxial strain test data into the equation:
F
T
=
2
(
σ
1
+
σ
2
+
σ
3
)
(
σ
1
-
σ
2
)
2
+
(
σ
2
-
σ
3
)
2
+
(
σ
3
-
σ
1
)
2
prior to the manipulating step, wherein F T is the triaxiality factor and σ 1 , σ 2 , and σ 3 are principle stresses.
19 . The process of claim 12 , wherein the manipulating step comprises calculating triaxiality-based strain-to-crack values by inputting the uniaxial strain test data and the triaxiality factor into the equation:
ɛ
f
=
Min
[
ɛ
u
F
T
;
ɛ
u
(
2
1
-
F
T
)
]
wherein F T is the triaxiality factor, ε u is the fracture strain for uniaxial loading, and ε f is the equivalent strain at fracture for multi-axial loading.
20 . The process of claim 12 , further comprising forging a preform formed of the precipitation-strengthened alloy to produce the turbine disk.Join the waitlist — get patent alerts
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