GH3128 (GH128) is a nickel-based alloy that is solid solution strengthened with tungsten and molybdenum and strengthened with boron, cerium and zirconium.
Electric welding and other characteristics.
Its comprehensive properties are better than similar nickel-based solid solution alloys such as GH3044 and GH3536.
It is suitable for the production of combustion chamber flame tubes, afterburner casings, regulating plates and other high-temperature parts of aircraft engines in long-term operation at 950°C.
The main products are cold-rolled sheets, and hot-rolled steel sheets can also be supplied , bars, forgings, wire and pipe fittings.
Availability Heat treatment and tempering temperature is 1140 ~ 1180 ºC, air cooling. The high temperature characteristics are tested after filling solution treatment at 1200ºC.
Cold-rolled sheet 0.8-4.0mm, hot-rolled steel plate 4-14mm, cold-drawn electrode Φ0.3-10mm.
Cold-rolled steel sheets and hot-rolled steel sheets are passivated in solution and pickling; electrodes are in cold-drawn, semi-hard or solid solution and pickling passivation.
Non-vacuum pump or vacuum induction furnace plus electroslag remelting.
The alloy is suitable for the production of aircraft engine combustion chambers and afterburner parts that work below 950 °C, and the actual application effect is excellent.
Chemical composition of GH3128:
C(%):≤0.05
Cr(%): 19.0~22.0
Mo(%): 7.50~9.00
Ni (%): remaining
W(%): 7.50~9.00
Al(%): 0.40~0.80
Nb(%):-
Ti(%): 0.40~0.80
Fe(%):≤2.0
Si(%)≤:0.80
GH3128 process performance:
Relative density g/cm3 (8.81)
Melting point °C (1340)
Thermal conductivity λ/(W/m•ºC)(11.3(100ºC))
Specific heat J/kg·ºC(--)
Elastic Die GPa (208)
Shear modulus GPa (---)
Resistance μΩ·m (1.37)
Poisson's ratio(--)
Thermal expansion coefficient a/10-6ºC-1 (11.25(20~100ºC)).
Heat treatment process method (aging treatment)
Compressive strength σb/MPa (735)
Tensile strength σp0.2/MPa (--)
Tensile strength σ5/% (40)
Tensile strength HBS (--)
The main purpose of GH3128 (GH128)
Aircraft engine combustion chamber flame tube, afterburner cover, regulating sheet
*Parts of gas turbine combustion chamber
*Turbo engine combustion chamber parts
*Afterburner parts
GH3128 alloy composition structure
The alloy has a single-phase austenitic structure in the heat-tempered condition, with a small amount of finely distributed TiN and M6C.
Process performance and regulations
1. The furnace temperature should not be higher than 700ºC during ingot forging, and the final forging temperature should exceed 900ºC.
2. The average grain size of the alloy is closely related to the deformation degree of the forging and the final forging temperature.
3. The alloy can be welded by argon arc welding machine, welding, seam welding and other methods.
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