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Place of Origin
HS-CODE
75-
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Detailed Description
InconelX-750(NO7750) the aging strengthening nickel-based superalloy
Features and applications overview:
InconelX-750 is a nickel-base superalloy aging strengthened by γ'[Ni3(Al、Ti、Nb)] phase, and has good corrosion resistance and oxidation resistance under 980°C, rather high strength under 800°C, quite good resistance under 540°C. It also has good formability and weldability. The alloy is mainly for manufacturing high-strength and corrosion resistant annulus parts, structural parts, bolts, and other parts of aircraft engine operating at 800°C, and flat springs and coil springs with medium or lower stress and relaxation resistance working at 540°C. It can also be used for manufacturing turbine blades of gas turbine and other parts.
InconelX-750's similar grades:
GH4145 GH145(China)、NCl5FeTNbA(France)、W.Nr.2.4668 NiCr15Fe7TiAl(Germany) NCF750(Japan)
Chemical composition, %:
Nickel + Cobalt...........................70 min
Chromium..................................14.0-17.0
Iron.............................................5.0-9.0
Carbon........................................0.08 max
Manganese..................................1.0 max
Silicon.........................................0.05 max
Sulfur...........................................0.01 max
Copper..........................................0.5 max
Aluminium....................................0.4-1.0
Titanium........................................2.35-2.75
Physical properties：
Density, g/cm3 ......................................................................................8.25
Melting Range, °C................................................................................1395-1425
Thermal conductivity, λ/(W/m•°C), at 100°C ......................................14.7
Specific heat, J/kg•°C.............................................................................430
Elastic modulus, GPa..............................................................................214
Electrical resistivity, μΩ•m....................................................................1.22
Coefficient of linear expansion, a/10-6°C-1, at 20-100°C.............13.1
Mechanical properties：(the minimum value detected at room temperature)
Tensile strength, σb/MPa.....................................930
Yield strength,σp0.2/MPa...............................515
Elongation,σ5 /%...................................................................30
The way of heat treatment is solution treatment
Available products and specifications:
Bar: ASTM B637, AMS 5667, AMS 5668, AMS 5669, AMS 5670, AMS 5671, AMS 5741, AMS 5749, ASME SB637
Forging: ASTM B637, AMS 5667, AMS 5668, AMS 5670, AMS 5671, AMS 5747, AMS 5749, ASME SB637
Plate/Strip: AMS 5542, AMS 5598
Wire: AMS 5698, AMS 5598
Pipe: AMS 5582
The metallurgical structure of Inconel X-750:
The structure of the alloy in the state of standard heat-treatment consists of γ matrix、Ti(C、N)、Nb(C、N)、M23C6 carbides and γ'[Ni3(Al、Ti、Nb)] phase. γ' is the main strengthening phase of the alloy and it accounts for 14.5%.
The process performance and requirements of Inconel X-750:
The alloy is easy to shape when the forging temperature is between 950 and 1220°C. The solution treatment follows the intense molding step.
The average size of the grain size of the alloy is closely related to the forging deformation degree and the final forging temperature.
The alloy has good weldability and is suitable for any welding. Aging treatment after welding enables the alloy to obtain the strength of near perfect heat treatment.
The heat processing of the parts shall be operated in the sulfur-free neutral or reducing atmosphere in order to avoid vulcanization.
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