Equivalent alloy:
GH90(China), UNS No7090 (US), Nimonic90 (English),
Chemical composition:
|
Alloy |
% |
NI |
CR |
FE |
MO |
NB |
CO |
C |
MO |
SI |
S |
CU |
A1 |
TI |
|
Nimonic 90 |
The minimum |
Margin |
18.0 |
|
|
|
15.0 |
|
|
|
|
|
1.0 |
2.0 |
|
The maxmum |
21.0 |
1.5 |
|
|
21.0 |
0.13 |
0.4 |
0.8 |
0.015 |
0.2 |
2.0 |
3.0 |
Physical properties:
|
The density |
Melting point |
Thermal conductivity |
Specific heat capacity |
Modulus of elasticity |
Shear modulus |
Linear expansion coefficient of |
|
8.2 |
1400 |
21.76(100℃) |
|
225 |
|
12.71(20~100℃) |
Minimum mechanical properties at room temperature:
|
Heat treatment |
Tensile strengthσb/MPa |
The yield strengthσp0.2/MPa |
elongationσ5 /% |
hardness |
|
Solution treatment |
820 |
590 |
8 |
|
Metallographic microstructure structure:
This alloy is mainly strengtheningPHase is gamma '- Ni3 (Ti, Al), in the intracrystalline with square makings shut precipitation of different size, on the grain boundary can also see the shape of the gamma'PHase and carbide precipitation on the grain boundary is discontinuous chains.
The main characteristics:
Limitation of the alloy is improved high temperature deformation of nickel and cobalt base alloy, contains a high amount of cobalt and a variety of reinforcement element, the alloy in 815 ~815℃has higher tensile strength and creep resistance, good resistance to oxidation and corrosion resistance ability, in cold and hot again and again under the action of alternating have high fatigue strength and good formability and weldability. Lower than1040℃has good oxidation resistance and corrosion resistance ability, at above1040℃are prone to intergranular oxidation.
Process performance and requirements:
1、Alloy during forging are prone to crack, to allow heavy hammer blow. Ingot furnace temperature is not higher than700℃, low temperature area to preheat the first 20-30 minutes, finally the heating temperature of1150℃to1180℃, open forging temperature is not lower than1050℃, the final forging temperature is not lower than950℃.
2、The size of the average grain size of the alloy and the forging deformation degree, finish forging temperature are closely related.Alloy in the solid solution state can be inert gas tungsten arc welding and flash butt welding.
3、furnace charging preheating 20-30 minutes after low temperature area, 1150-1180℃heat into the high temperature area.
The above data is for your reference, should you have any special requirements, please contact us!