Material grade GH907
Similar grade Incoloy 907 (USA)
GH907 alloy overview
GH907 alloy is a low-expansion superalloy based on Fe-Co-Ni.
It is comprehensively strengthened with Nb, Ti, Si and trace B. It has high strength, low expansion coefficient, good thermal fatigue performance and high temperature below 650ºC.
Almost constant elastic modulus. Low-expansion superalloy is a new type of structural material developed by relying on "Invar effect" and "aging strengthening".
With its low expansion coefficient, the clearance control of aero-engines can be realized, and it is especially suitable for manufacturing various types of aero-engine rings. piece.
GH907 Chemical Composition
Heat treatment system There are two heat treatment systems for the alloy
System A; 1040 (' soil l5 (', 1h, air-cooled or quick-dry 800C±15C.l6h, furnace-cooled to 620C±15C.8h at a speed of 55C/h, air-cooled.
System B: 980C=15C, 1h, air cooling or fast cooling +775C±15(', 12h, furnace cooling to 620C ± 15C 8h at a speed of 55C/h, air cooling.
Welding performance The alloy has satisfactory welding performance and can be welded by argon arc welding, electron beam welding and brazing. electron beam welded
The joint strength factor is greater than 85%. Not only the same material can be welded, but also can be welded with various alloys such as GH4169 and GH141.
GH907 alloy characteristics introduction
Incoloy907 is developed on the basis of Incoloy903 by appropriately reducing the Al content (generally controlling Al≤0.1wt%) and increasing the Nb content.
This alloy significantly improves notch durability while maintaining good ductility and a low coefficient of expansion, but with a slight reduction in instantaneous strength.
There are γ'-NigAl phase, Niz (TiAl)], ζ phase (Fe, Ni, Co); (Nb, Ti) and a small amount of Laves phase (Fe2Nb) in the alloy structure, which has a more complex structure.
The z-phase is mainly distributed at the grain boundary, which hinders the grain boundary slip and effectively improves the notch lasting strength.
The Laves phase content is very small and has little effect on performance.
The alloy can obtain good comprehensive properties mainly through the proper coordination of γ' phase and Z phase.
When studying the same type of alloys in my country, it was found that the Si content and thermal process parameters are very sensitive to the properties of the alloy.
Controlling the Si content at about 0.25wt% can achieve better lasting properties.
GH907 alloy 1 is an austenitic superalloy that is based on Fe-Ni-Co and is precipitation-strengthened by Nb and Ti.
Because the alloy has low thermal expansion coefficient, almost constant elastic modulus, high tensile strength, good resistance to high-pressure hydrogen embrittlement, good resistance to cold and thermal fatigue and good welding performance below 650 °C, the main
It is used to manufacture static parts such as aero-engine turbine outer ring, compressor casing and sealing ring.
The operating temperature is generally around 650 °C.
In recent years, GH907 alloy has been used in other engine models, and its maximum operating temperature is close to 700ºC.
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GH907 is a Fe-Ni-Co-based precipitation hardening low-expansion deformation superalloy, which is comprehensively strengthened by adding niobium, titanium, silicon and trace boron elements.
The alloy has high strength below 650 ºC, low expansion coefficient, good thermal fatigue resistance and almost constant elastic modulus.
The Curie point is between 400°C and 450°C. The expansion coefficient of alloys below the Curie point is basically unchanged.
It is suitable for making all kinds of aviation and aerospace engine rings and casings used below 650ºC.
main products include bars, forgings, plates and strips.
Chemical composition of GH907:
Carbon c : ≤0.06
Chromium cr: ≤1.00
Nickel ni: 35.00~40.00
Cobalt co: 12.00~16.00
Tungsten w:
Molybdenum mo:
Aluminum al: ≤0.20
Titanium ti: 1.30~1.80
Iron fe: Yu
Niobium nb: 4.30~5.20
Boron b: ≤0.012
Silicon si: 0.07~0.35
Manganese mn: ≤1.00
Phosphorus p: ≤0.015
Sulfur s: ≤0.015
Copper cu: ≤0.500
Product Overview and Features
Material Technical Standards
GB/T 14992 Classification and designation of high temperature materials of superalloys and intermetallic compounds
GJB 5261 Specification for Low Expansion Superalloy Bars
HB 7682 Low expansion GH907 superalloy ring blanks and rings
Heat treatment process of HB/Z 140 superalloy for aviation
Q/GYB 05067GH2907 Alloy Cold Rolled Sheet and Strip
Q/GYB 05069 HGH2907 alloy cold drawn wire for welding
Melting process
Vacuum induction furnace + vacuum arc remelting, or vacuum induction furnace + electroslag remelting smelting process.
Melting temperature range 1332ºC~1400ºC
density 8.28g/cm3
Magnetic properties
Ferromagnetic below 450ºC, paramagnetic above 450ºC.
Heat treatment system
From HB/Z 140, GJB 5261, HB 7682, Q/'GYB 05067 and Q/GYB 05069, there are two standard heat treatment regimes:
System A: 1040ºC±15ºC×1 h/AC or fast cooling +800ºC±15ºC×16h/FC(55ºC/h)→620ºC±15ºC×8h/AC, suitable for brazing parts
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