GH4698(GH698、Зи4698、XH73MTTЮ)
1.Composition(wt%)
|
C
|
Cr
|
Ni
|
Mo
|
Al
|
Ti
|
Fe
|
Nb
|
Mg
|
|
≤0.08
|
13.0-16.0
|
balance
|
2.8-3.2
|
1.3-1.7
|
2.35-2.75
|
≤2.0
|
1.8-2.2
|
≤0.008
|
|
B
|
Zr
|
Ce
|
Si
|
Mn
|
P
|
S
|
Cu
|
- |
|
≤0.005
|
≤0.05
|
≤0.005
|
≤0.6
|
≤0.4
|
≤0.015
|
≤0.007
|
≤0.07
|
- |
2.Physical Properties
|
Density
(g/cm3)
|
Thermal expansion coefficient
(20-100℃)(10-6 ℃-1)
|
Thermal conductivity
λw/（m·℃）（50℃）
|
Electric resistance
/Ω·mm2/m
|
|
8.31
|
12.11
|
23.5
|
0.332
|
|
Melting
℃
|
Poisson ratio
|
Specific heat capacity
J/(kg·℃)
|
Elastic modulus
(GPa)
|
|
1340-1365
|
0.40
|
422.2
|
219.5-223.7
|
3.Properties
1.Mechanical properties
|
Condition
|
Temperature/℃
|
бb N/mm2
|
б0.2N/mm2
|
δ5/%
|
ψ/%
|
Ak/KJ/m2
|
|
Annealing+ageing
|
20
|
1127-1244.6
|
705.6-774.2
|
24-33
|
27-32
|
588-1078
|
|
450
|
1009.4-1146.6
|
666.4-686
|
27-35
|
33-38
|
784-1372
|
|
550
|
999.6-1127
|
646.8-705.6
|
25-32
|
30-40
|
784-1274
|
|
650
|
989.8-1107.4
|
617.4-725.2
|
17-28
|
19-28
|
686-1078
|
|
700
|
891.8-1029
|
686-754.6
|
8-24
|
12-26
|
588-1078
|
|
750
|
793.8-901.6
|
617.4-695.8
|
6-22
|
12-23
|
588-980
|
|
800
|
666.4-744.8
|
568.4-637
|
7-25
|
12-25
|
686-1078
|
2.Endurance
|
Condition
|
Temperature/℃
|
Smooth specimens
|
Notch specimens
|
|
б/N/mm2
|
τ/h
|
δ%
|
ψ/%
|
бH/N/mm2
|
τ/h
|
|
Annealing+ageing
|
450
|
1029
|
>100
|
-
|
-
|
-
|
-
|
|
550
|
980
|
>100
|
17-16
|
13-16
|
-
|
-
|
|
600
|
833
|
>100
|
3-8
|
9-12
|
-
|
-
|
|
650
|
725.2
|
>100
|
4-8
|
4-10
|
882
|
>100
|
|
700
|
539
|
>100
|
3-8
|
6-10
|
-
|
-
|
|
750
|
411.6
|
>100
|
5-9
|
8-11
|
411.6
|
>100
|
|
800
|
313.6
|
45-90
|
3-9
|
8-12
|
-
|
-
|
3.Creep and fatigue properties
|
Condition
|
Temperature
℃
|
Creep properties
|
Fatigue properties
|
|
б
N/mm2
|
τ/h
|
RD%
|
SS
|
NS
r=0.75mm
|
|
б-1
N/mm2
|
N
(cycle)
|
бH-1
N/mm2
|
N
(cycle)
|
|
Annealing+ageing
|
600
|
705.6
|
100
|
<0.2
|
-
|
-
|
-
|
-
|
|
650
|
646.8
|
100
|
<0.2
|
333.2
|
<107
|
284.2
|
>107
|
|
700
|
411.6
|
100
|
<0.2
|
-
|
-
|
-
|
-
|
|
750
|
382.2
|
100
|
<0.2
|
362.6
|
>107
|
284.2-294
|
>107
|
Note:RD= residual deformation ; SS=smooth specimens ; NS= notch specimens
4.After long term ageing properties
（1）Mechanical properties
|
Condition
|
20℃
|
750℃
|
|
бb
N/mm2
|
б0.2
N/mm2
|
δ
%
|
ψ
%
|
Ak
kj/m2
|
бb
N/mm2
|
б0.2
N/mm2
|
δ
%
|
ψ
%
|
|
Standard heat treatment
(+700℃,600h)
|
1362.2
|
872.2
|
25
|
31
|
686
|
852.6
|
617.5
|
33
|
43
|
（2）Endurance properties
|
Condition
|
Temperature
/℃
|
SS
|
NS
r=0.5mm
|
|
Standard heat treatment
(+700℃,600h)
|
750
|
б
N/mm2
|
τ
h
|
δ
%
|
ψ
%
|
б
N/mm2
|
τ
h
|
|
411.6
|
204
|
21
|
25
|
617.4
|
88
|
Note:RD= residual deformation ; SS=smooth specimens ; NS= notch specimens
(3)Fatigue properties
|
Condition
|
Temperature
/℃
|
б/N/mm2
|
N
t(cycle)
|
|
Standard heat treatment
(+700℃,600h)
|
750
|
362.6
|
>107
|
4.Characteristics
Good endurance strength ,tensile strength and plasticity, stable organization for long term use and good integrated properties in 550-800℃.
Oxidation resistance：
|
Temperature
/℃
|
Soaking time
/h
|
Weight gains
/g/(m2•h)
|
|
900
|
100
|
0.0708
|
|
1000
|
100
|
0.2326
|
5.Structure
Nickel base alloy, with the Ni3 (Al, Ti, Nb) phase aging strengthening.
Existing γˊand a trace of carbide and boride phase on the austenite （γ）matrix after solid solution treatment.
Keeping stable organization and properties after ageing of 1000hours in 650-750℃, and no new phase precipitation.
6.Applications
Provided in the form of turbine disc working up to 550-800 ℃, compressor plate, guide piece, bearing ring and
other time work and heavy-duty engine parts.
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