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Inconel 718 Precipitation Enhanced Nickel-Based Superalloy
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Inconel 718 Features and Applications Overview:
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The alloy has a good overall performance in the temperature range of -253 ~ 700 ℃. The yield strength below 650 ℃ ranks first in the deformed superalloy and has good resistance to fatigue, radiation, oxidation and corrosion as well as good Processing performance, good welding performance. Can produce a variety of complex shapes of parts and components, in the aerospace, nuclear energy, petroleum industry and extrusion die, in the above temperature range has been very widely used.
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Inconel 718 Similar Plaques:
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GH4169 GH169 (China), NC19FeNb (France), W.Nr.2.4668 NiCr19Fe19Nb5 (Germany)
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Inconel 718 chemical composition：
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Alloy
Grade
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%
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Ni
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Cr
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Fe
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Mo
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Nb
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Co
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C
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Mn
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Si
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S
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Cu
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Al
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Ti
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Inconel
718
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Min
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50
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17
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Margin
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2.8
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4.75
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0.20
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0.65
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Maximum
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55
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21
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3.3
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5.50
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1.0
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0.08
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0.35
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0.35
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0.015
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0.30
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0.80
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1.15
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Inconel 718 Physical Properties：
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Density
g/cm3
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Melting point
℃
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Thermal conductivity
λ/(W/m•℃)
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Specific heat capacity
J/kg•℃
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Elastic Modulus
GPa
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Shear modulus
GPa
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Resistivity
μΩ•m
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Poisson's ratio
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Linear expansion coefficient
a/10-6℃-1
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8.24
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1260
1320
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14.7(100℃)
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435
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199,9
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77,2
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1.15
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0.3
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11.8(20~100℃)
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Inconel 718 mechanical properties: (at 20 ℃ minimum detection of mechanical properties)
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Heat treatment methods
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Tensile strength σb / MPa
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Yield strength σp0.2 / MPa
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Elongation rate σ5 /%
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Brinell hardness HBS
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Solution treatment
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965
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550
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30
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≥363
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Inconel 718 Production Executive Standard：
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Standard
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Bar
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Forgings
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Plate (with) material
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Wire
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Pipe
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American Society for Testing and Materials
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ASTM B637
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ASTM B637
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ASTM B670
ASTM B906
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American Aerospace Materials Technical Specification
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AMS 5662
AMS 5663
AMS 5664
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AMS 5662
AMS 5663
AMS 5664
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AMS 5596
AMS 5597
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AMS 5832
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AMS 5589
AMS 5590
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American Society of Mechanical Engineers
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ASME SB637
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ASME SB637
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Inconel 718 microstructure：
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The standard heat treatment of the organization of the alloy from the gamma matrix γ ', γ', δ, NbC phase composition
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Inconel 718 process performance and requirements：
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1, Due to the high niobium content in Inconel718 alloy, the degree of niobium segregation in the alloy is directly related to the metallurgical process.
2, in order to avoid the element segregation in the ingot too heavy, the ingot diameter of not more than 508mm.
3, the homogenized alloy has good hot workability, ingot billet heating temperature shall not exceed 1120 ℃.
4, the alloy grain size and the average forging deformation degree, final forging temperature is closely related.
5, the alloy has satisfactory welding performance, available welding, electron beam welding, seam welding, spot welding and other methods of welding.
6, different alloy solution treatment and aging process will get different material properties. Due to the low diffusion rate of the γ "phase, Inconel 718 alloys get the best mechanical properties through prolonged aging.
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