GH901 is an austenitic age-hardening alloy based on Fe-43Ni-12Cr, adding titanium, aluminum and equivalent strengthening elements, and contains a small amount of boron and lower carbon, and is metastable γ"[Ni3(Ti, Al)] phase dispersion strengthening, a small amount of aluminum can inhibit the transformation of γ" to η-Ni3Ti phase.
The alloy has high yield strength and lasting 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 disc parts (turbine discs, compressor discs, journals, etc.), static structural parts, turbine Parts such as outer ring and fasteners.
GH901 Austenitic age hardening superalloy
GH901 Heat Treatment System
1090ºC±10ºC, 2~3h, water cooling or oil cooling+775ºC±5ºC, 4h, air cooling+700~720ºC, 24h, air cooling.
GH901 Variety Specifications and Status
Various disc forgings, rolled rings, bars and other forgings. The state may be heat treated or not.
GH901 Melting and casting process
The alloy is produced by the double process of vacuum induction and vacuum arc remelting, or vacuum induction and electroslag remelting process.
GH901 Application Overview and Special Requirements
The alloy is widely used in the rotating parts and fasteners of aero-engines and ground gas turbines working below 650 ºC in foreign countries, and has a long service life. It has also been used in aero-engines in China, and it is a mature alloy that has been tested in use.
When the alloy is forged, if the process parameters are selected or operated improperly, its properties will show obvious directionality and may cause notch sensitivity, but as long as the process is strict, this phenomenon will not occur. The coefficient of expansion of this alloy is close to that of ferritic heat-strength alloy steel, which enables two materials to be joined without special provisions on the heat account.
1.1, GH901 material grade
GH901 (GH109)
1.2, GH901 similar grades
Incoloy901 (US), Nimonic901 (UK), Z8NCDT42 (France), 2.4662 (Germany)
1.3. Technical standard of GH901 material
WS9-7029 Billet-1996 "GH901 Alloy Shaft Bar"
WS9-7029 Disc Blank - 1996 "Bake Blank for GH901 Alloy Turning Parts"
WS9-7029 Forgings-1996 "GH901 Alloy Disc and Shaft Forgings"
WS9-7031-1996 "GH901 Alloy Hot Rolled and Forged Bars"
WS9-7031 Ring Billet-1996 "Ring Billet for GH901 Alloy Rolled Ring Parts"
WS9-7031 Rings-1996 "GH901 Alloy Rolled Rings"
WS9-7031-1996 "GH901 Alloy Flash Welding Ring Profile"
1.4. Chemical composition of GH901 (GH128)
Table 1-1
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
organizational structure
3.1 Transformation temperature
The γ phase starts to dissolve at about 950°C, and the η phase starts to dissolve at 975°C.
3.2 Alloy structure
In the standard heat treatment state, the alloy structure is a spherical γ phase precipitated on the austenite matrix with a small amount of MC and M3B2 phases. The γ phase is dispersed in the grain, with a diameter of about 14~20mm, accounting for about 10%~12% of the weight of the alloy, and its chemical composition is approximately (Ni0.95Fe0.03Cr0.02) a (Ti0.85Al0.15). The total amount of MC and M2B2 phases is about 0.27%~0.35% of the alloy weight.
Process performance
The alloy has good hot forming properties.
4.1. Forging
Larger ingots are not allowed to be cooled directly to room temperature, but should be hot handled and moved directly into the forging furnace to prevent passing through the aging temperature range during cooling and reheating. The ingot should be forged into a square billet with a maximum side length of 205mm, and then quickly cooled and trimmed. During forging, the process parameters should be strictly controlled to prevent serious unevenness of coarse and fine grains (there is a clear boundary between the two) to ensure stable performance.
4.2 Welding performance
Argon arc welding can be carried out, using GH901 alloy welding wire.
4.3 Heat treatment process of parts
The heat treatment of the engine turbine disk should avoid excessive heating.
GH901 Physical and chemical properties
2.1, GH901 thermal performance
2.1.1. Melting temperature range of GH901 Melting point is 1360ºC
2.2, GH901 density
ρ=8.21g/cm3
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