GH901 is an austenitic age-hardening alloy based on Fe-43Ni-12Cr, with titanium, aluminum and equal strengthening elements added. It also contains trace amounts of boron and lower carbon. It is metastable γ"[Ni3(Ti, Al)] phase dispersion strengthening, and trace amounts of aluminum can inhibit the transformation of γ" to eta-Ni3Ti phase. The alloy has high yield strength and durable strength below 650°C, good oxidation resistance below 760°C, and stable structure for long-term use. This alloy is a relatively mature alloy developed in the early stage and is widely used in the manufacture of rotating disk parts (turbine disk, compressor disk, journal, etc.), static structural parts, turbines of aviation and ground gas turbine engines operating below 650°C. Outer rings and fasteners and other parts.
1. Chemical composition of cobalt-based alloy (GH901)
|
C
|
Cr
|
Ni
|
Mo
|
Al
|
Ti
|
Fe
|
B
|
|
0.02～0.06
|
11.0～14.0
|
40.0～45.0
|
5.0～6.5
|
≤0.30
|
2.8～3.1
|
Remain
|
0.01～0.02
|
|
Mn
|
Si
|
P
|
S
|
Cu
|
Bi
|
Pb
|
Ag
|
|
no greater than
|
no greater than
|
no greater than
|
no greater than
|
no greater than
|
no greater than
|
no greater than
|
no greater than
|
|
0.50
|
0.40
|
0.020
|
0.008
|
0.20
|
0.0001
|
0.001
|
0.0005
|
2. Cobalt-based alloy (GH901) similar brands：
Incoloy901 (USA), Nimonic901 (UK), Z8NCDT42 (France), 2.4662 (Germany)
3. Cobalt-based alloy (GH901) processing performance:
Cobalt-based alloy (GH901) has good hot forming properties.
1. Forging
Larger steel ingots are not allowed to be cooled directly to room temperature, but should be moved directly into the forging heating furnace to prevent them from passing through the aging temperature range during cooling and reheating. The ingot should be forged into a billet with a side length of 205mm, and then quickly cooled and trimmed. During forging, process parameters should be strictly controlled to prevent serious unevenness of coarse and fine grains (there is an obvious boundary between the two) and ensure stable performance.
2. Welding performance
Argon arc welding can be performed using GH901 alloy welding wire.
3. Parts heat treatment process
When heating the engine turbine disk heat treatment, excessive heating speed should be avoided.
4. Antioxidant properties of GH901
Oxidation rate after 100h test in air medium, corrosion resistance of GH901 alloy is prone to pit corrosion in hydrochloric acid solution.
|
θ/℃
|
600
|
700
|
800
|
900
|
1000
|
|
Oxidation rate/（g/(m3·h））
|
0.0072
|
0.0140
|
0.0522
|
0.1665
|
0.2367
|
