| Application: | Industrial |
|---|---|
| Standard: | GB, ASTM |
| Purity: | >99.5% |
| Alloy: | Alloy |
| Powder: | Not Powder |
| Transport Package: | Wooden |
| Customization: |
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Audited Supplier GH710 Overview
GH710 is a nickel-chromium-cobalt-based precipitation-hardening, forgeable and castable refractory superalloy with addition of various strengthening elements such as titanium and aluminum. It has high strength, high anti-sulfur corrosion, anti-oxidation performance and good tissue stability below 900 ºC. It can manufacture turbine rotor blades and discs, as well as integral gas turbine rotors, with operating temperatures up to 980 °C. Bars, forgings or blanks can be supplied.
GH710 technical standard
HB 5423-1989 "GH710 Alloy Cake Blank Forgings for Aviation"
C3S129-1989 "GH710 Alloy Cake Blank Forgings"
GH710 Chemical Composition
Element C Cr Ni Co W Mo Al Ti Fe B Zr Ce Si Mn Cu
MIN 16.5 Balance 13.5 1.0 2.5 2.0 4.5 0.01
MAX 0.10 19.5 16.0 2.0 3.5 3.0 5.5 1.0 0.03 0.06 0.02 0.15 0.15 0.1
GH710 corresponding grades: GH4710, Udimet710
GH710 Heat Treatment System
The standard heat treatment system for blank forgings is: 1170°C±10°C, 4h, air cooling+1080°C±10°C, 4h, air cooling+845°C±10°C, 24h, air cooling+760±10°C, 16h, air cooling.
GH710 Variety Specifications and Technological Status
We can supply free-forging billets and bars, all of which are delivered without heat treatment.
GH710 Melting and Casting Process
The alloy used for forgings is smelted by vacuum induction furnace and vacuum arc remelting, or vacuum induction melting and electroslag remelting process can also be used.
GH710 application overview and special requirements
The alloy can be used at 760-950 ºC, and has been used to manufacture integral turbine disks of turboshaft engines, and has been used for a long time in helicopters and oil field generators.
GH710 process performance and requirements
(1) Formability
There is serious element segregation in the ingot. The dendrites in the as-cast structure are serious, and a large number of primary γ' phases and MC phases are enriched between the dendrites, which makes the hot forming properties of the ingots poor, and cracks are prone to occur during deformation. After the ingot is homogenized at 1140 ºC for 8 hours, or 1160 ºC for more than 4 hours, the hot forming ability can be improved.
The forging heating temperature is 1130-1140 °C, and the final forging temperature is greater than 1000 °C. The rolling heating temperature is 1150 °C, and the final rolling temperature is greater than 980 °C. During the hot working process, attention should be paid to uniform temperature and uniform deformation.
(2) Heat treatment process of parts
There are two optional temperatures for the first solid solution of parts heat treatment: 1170ºC±10ºC or 1150ºC±10ºC. For alloys treated at two temperatures, the former has coarse grains and the latter is fine, and the properties related to grain size are affected.
During heat treatment, the parts should be heated slowly and uniformly. Usually, the step heating method is used to heat up, and the solution treatment temperature is strictly controlled to ensure the quality.
(3) Surface treatment process
Argon protection can be used to eliminate residual stress annealing on the surface, as well as surface strengthening by shot peening, electropolishing and other processes. To ensure safe and reliable use of parts, attention should be paid to surface integrity.
GH710 Machining and Grinding Performance
(1) The machinability is poor, about twice the difference compared with the GH4033 alloy.
(2) The depth of the heat-affected layer on the surface of the electric pulse machining increases with the increase of the working current. The working current changes obviously in the range of 10-20A. The maximum heat-affected layer depth of the sample is 0.27mm.
(3) The grinding process is fully cooled, and local grinding burns will affect the performance of the parts.
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