| Application: | Industrial |
|---|---|
| Standard: | GB, ASTM |
| Purity: | >99.5% |
| Alloy: | Alloy |
| Powder: | Not Powder |
| Transport Package: | Wooden |
| Customization: |
|---|
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Audited Supplier GH90 is an aging-strengthened nickel-based wrought superalloy, which contains a relatively high amount of cobalt and various strengthening elements.
The alloy has high tensile strength and creep resistance at 815 ~ 870 ºC, good oxidation resistance and corrosion resistance, high fatigue strength under the repeated alternating action of cold and heat, and good formability and welding. sex.
It mainly supplies hot-rolled and cold-drawn bars, cold-rolled sheets, strips and cold-drawn wires.
Used in turbine engine turbine disks, blades, high temperature fasteners, clamps, sealing rings and elastic elements, etc.
Foreign name: GH90
Similar brand: Nimonic90 (UK)
Properties: Age-strengthened nickel-based wrought superalloy
Contains: higher amount of cobalt and various strengthening elements
basic introduction
1.1, material grade
GH90
1.2, similar grades
Nimonic90 (UK)
1.3. Technical standards of materials
WS9 7014-1996 "Cold wire drawing material for GH90 alloy spring"
WS9 7015.1-1996 "Spring wire of GH90 alloy cold drawn and solution treated"
WS9 7015.2-1996 "Spring Flat Wire of GH90 Alloy Cold Drawing and Solution Treatment"
WS9 7016-1996 "GH90 Alloy Cold Drawn Bar"
WS9 7086-1996 "GH90 Alloy Cold Rolled Sheet and Strip (Hard State)"
WS9 7087-1996 "GH90 Alloy Cold Rolled Sheet and Strip (Soft State)"
1.4, Chemical composition
Table 1-1.
C Cr Ni Co Al Ti
≤0.13 18.0~21.0 margin 15.0~21.0 1.0~2.0 2.0~3.0
Mn Si P S Ag Pb Bi B Cu Fe Zr
≤0.4 ≤0.8 ≤0.02 ≤0.015 ≤0.0005 ≤0.002 ≤0.0001 ≤0.20 ≤0.2 ≤1.5 ≤0.15
Note: Wire regulations (pb)≤0.001%.
1.5. Heat treatment system
1.5.1. Cold drawn bar: 1080ºC±10ºC, see Table 1-2 for holding time, air cooling or water cooling +750ºC±10ºC, 4h, air cooling.
Table 1-2
Diameter or smaller section size/mm ≤3 >3~6 >6~12.5 >12.5~25
t/h 1 2 4 8
1.5.2. Sheet and strip (soft state): softening treatment at 1100~1150ºC, 1~10min, cooling in appropriate medium +750ºC±10ºC, 4h, air cooling.
1.5.3. Sheet and strip (hard state): 700~725ºC, 4h, air cooling.
1.5.4 Cold drawing material for spring: +600ºC±10ºC, 16h, air cooling or +650ºC±10ºC, 4h air cooling.
1.5.5 Spring wire for cold drawing and solution treatment: 1080ºC±10ºC, 8h, air cooling +700~750ºC±10ºC, 4h, air cooling.
1.6. Variety Specifications and Supply Status
Supply cold-drawn bar or cold-drawn hexagonal bar with diameter or inscribed circle diameter not greater than 25mm; cold-rolled sheet with thickness not greater than 4mm and cold-rolled strip with thickness not greater than 0.8mm; spring with diameter not greater than 8mm Brushed material.
The supply status of cold-drawn bars is divided into: according to the use, the bars for upsetting are delivered in a cold-drawn and polished state (when the buyer requires delivery in a solid solution state, it should be indicated in the contract); bars for machining Delivered in the state of solution and descaling.
Cold-rolled sheet and strip (soft state) are delivered after softening treatment, alkaline pickling, and trimming; cold-rolled sheet and strip (hard state) are delivered after cold-rolling and trimming.
The wire for spring is delivered in cold drawn state or solution treated state after cold drawing.
1.7. Melting and casting process
Alloys are smelted using one of the following four processes:
(1) Induction melting and electroslag remelting;
(2) Vacuum induction melting and electroslag remelting;
(3) Vacuum induction melting and vacuum arc remelting;
(4) Vacuum induction melting.
1.8. Application overview and special requirements
The alloy is used in engines as high temperature spring elements, high temperature fasteners, combustion chamber collars, stop pins and other components. In foreign countries, it is also used as turbine working blades, turbine disks and other parts.
Physical and chemical properties
2.1. Thermal performance
2.1.1. Melting temperature range Melting point 1400ºC
2.1.2. Thermal conductivity
table 2-1
θ/°C 600 700 800
λ/(W/(m·C)) 21.76 23.93 25.57
2.1.3. Linear expansion coefficient
Table 2-2
θ/°C 20~100 20~200 20~300 20~400 20~500 20~600 20~700 20~800 20~900
α/10-6C-1 12.71 13.09 13.51 14.04 14.52 15.03 15.58 16.36 17.38
2.2. Density
ρ=8.20g/cm3
2.3. Electrical properties
2.4. Magnetic properties
The alloy is non-magnetic.
2.5, chemical properties
The alloy has good oxidation resistance and corrosion resistance below 1040 °C; intergranular oxidation is easy to occur when it is above 1040 °C.
Metallographic structure
The main strengthening phase of the alloy is γ'-Ni3 (Ti, Al), which is precipitated in the grain as square particles of different sizes. This shape of γ' phase can also be seen on the grain boundary, and the carbides are on the grain boundary. Precipitates in discontinuous chains.
Process performance requirements
1. The alloy is prone to internal cracks during forging, heavy hammer blows are not allowed, and low temperature chamfering is not allowed. The charging temperature of the ingot shall not be higher than 700ºC, the final heating temperature shall be 1150ºC±10ºC, the opening forging temperature shall not be lower than 1060ºC, and the final forging temperature shall not be lower than 950ºC.
2. The average grain size of the alloy is closely related to the deformation degree and final forging temperature of the forging.
3. The alloy can be inert gas shielded tungsten arc welding and flash in the solid solution state
After the furnace is installed, preheat the low temperature area for about 20-30 minutes, and push it into the high temperature area to heat at 1150-1180ºC
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