The GH4145 alloy is mainly a nickel-based superalloy with γ"[Ni3(Al, Ti, Nb)] phase for aging strengthening.
It has good corrosion resistance and oxidation resistance below 980 ºC, and has high strength below 800 ºC.
It has good relaxation resistance below 540°C, and also has good formability and welding performance.
The alloy is mainly used to manufacture flat springs and coil springs that are resistant to relaxation and require high strength for aero-engines that work below 800°C.
It can also be used to manufacture gas turbine turbine blades, etc.
The available varieties are sheet, strip, bar, forging, ring, wire and tube.
material grade
GH4145 (GH145)
Similar grades
Inconel X-750 (USA), NiCr15Fe7TiAl (Germany), NC15FeTNbA (France), NCF750 (Japan)
technical standards for materials
Q/3B 4088-1994 "GH4145 Alloy Capillary"
Q/3B 4098-1995 "GH4145 Alloy Wire"
Q/3B 4198-1993 "GH4145 Alloy Cold Rolled Sheet and Strip"
chemical composition
Table 1-1
C Cr Ni+Co Al Ti Fe Nb+Ta
≤0.08 14.0~17.0 ≥70.0 0.40~1.00 2.25~2.75 5.00~9.00 0.70~1.20
Co Mn Si S Cu P
≤1.00 ≤1.00 ≤0.50 ≤0.010 ≤0.50 ≤0.015
Note: Mn and Si in the table are the contents of rods, forgings, rings and wires. Plates, strips and pipes are: Mn≤0.35%, Si≤0.35%.
Physical and chemical properties
Thermal performance
It has good corrosion resistance and oxidation resistance below 980 °C, high strength below 800 °C, good relaxation resistance below 540 °C, and good formability and welding performance. This alloy is mainly used to manufacture flat springs and coil springs that are resistant to relaxation and require high strength for aero-engines that work below 800 °C. [1]
Melting temperature range
1395~1425ºC
Thermal conductivity
See Table 2-1
|
θ/ºC
|
50
|
100
|
300
|
500
|
900
|
|
λ/(W/(m·C))
|
14.7
|
15.9
|
20.1
|
25.1
|
37.3
|
2.1.3, GH4145 (GH145) linear expansion coefficient see table 2-2
|
θ/ºC
|
20~200
|
20~300
|
20~400
|
20~500
|
20~600
|
20~700
|
20~800
|
|
α/10-6C-1
|
13.1
|
13.5
|
14.1
|
14.4
|
15.0
|
15.6
|
16.2
|
density
ρ=8.25g/cm3
Electrical properties
Resistivity ρ=1.22*10-6Ω.m at 50ºC
Metallographic structure
The structure of the alloy in the standard heat treatment state is composed of γ matrix, Ti(C, N), Nb(C, N), M23C6 carbide and γ'[Ni3(Al, Ti, Nb)] phase, and the γ' content is about 14.5% , is the main strengthening phase of the alloy.
Process performance requirements
1. The forging temperature of the alloy is easy to form between 1220 and 950 °C. The alloy is solution treated after the vigorous forming process.
2. The average grain size of the alloy is closely related to the deformation degree and final forging temperature of the forging.
3. The alloy has good welding performance and can be welded in various ways. Aging treatment after welding can obtain approximately the strength of the fully heat-treated state.
4. The heat treatment of parts is carried out in a neutral or reducing atmosphere without sulfur to avoid vulcanization.
Heat treatment system
The solution heat treatment system for plates, strips and pipes in the supply state is 980°C ± 15°C, air-cooled. For the intermediate heat treatment system of materials and parts, the following processes can be selected for heat treatment.
Annealing: 955~1010ºC, water cooling.
Annealing of welded parts before welding: 980ºC, 1h.
Stress relief annealing of welded parts: 900ºC, moisturizing for 2h.
Stress relief annealing: 885ºC±15ºC, 24h, air cooling.
Specifications and Availability
Bars, forgings, rings, hot-rolled sheets, cold-rolled sheets, strips, tubes and wires can be supplied in various sizes.
Plates and strips are generally supplied after hot or cold rolling, annealing or solution, pickling and polishing.
Bars, forgings and rings can be supplied in the forged or hot rolled state; they can also be supplied in solution treatment after forging; bars can be supplied after solution and polished or turned, and can be supplied in cold when the order requires Pull state into place.
The wire can be supplied in the solid solution state; for the wire with a nominal diameter or thickness below 6.35mm, it can be solid solution and supplied with a cold drawing deformation of 50% to 65%; the nominal diameter or side length is greater than 6.35mm. Wire, after solution treatment, is supplied with a cold drawing deformation of not less than 30%. For wires with a nominal diameter or side length not greater than 0.65mm, they can be supplied with a cold-drawing deformation of not less than 15% after solution treatment as required. [1]
Melting and casting process
The alloy is remelted by electric arc furnace plus vacuum consumable, vacuum induction plus electroslag, electroslag plus vacuum consumable remelting or vacuum induction plus vacuum consumable remelting.
Application overview and special requirements
The alloy is mainly used to manufacture corrosion-resistant flat wave springs, circumferential coil springs, helical compression springs, spring clips and sealing rings with a working temperature below 540°C for aero-engines.
Company Profile
Test Equipment :
Company strength:
Certificate:
Welcome to contact us,thanks
Our products sales all over the world as well. From the following two websites you can also get more information about our company:
http://xingda-alloy.en.made-in-china.com
http://xingda-alloy.en.made-in-china.com
Welcome to contact us,thanks
Audited Supplier 
){kind=link}
){kind=link}