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Inconel 718 Precipitation strengthening nickel base superalloy

Inconel 718 Precipitation Enhanced Nickel-Based Superalloy

Inconel 718 Features and Applications Overview:

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.

Inconel 718 Similar Plaques:

GH4169 GH169 (China), NC19FeNb (France), W.Nr.2.4668 NiCr19Fe19Nb5 (Germany)

Inconel 718 chemical composition:

Alloy
Grade

%

Ni

Cr

Fe

Mo

Nb

Co

C

Mn

Si

S

Cu

Al

Ti

Inconel
718

Min

50

17

Margin

2.8

4.75

0.20

0.65

Maximum

55

21

3.3

5.50

1.0

0.08

0.35

0.35

0.015

0.30

0.80

1.15

Inconel 718 Physical Properties:

Density
g/cm3

Melting point

Thermal conductivity
λ/(W/m•℃)

Specific heat capacity
J/kg•℃

Elastic Modulus
GPa

Shear modulus
GPa

Resistivity
μΩ•m

Poisson's ratio

Linear expansion coefficient
a/10-6℃-1

8.24

1260
1320

14.7(100℃)

435

199,9

77,2

1.15

0.3

11.8(20~100℃)

Inconel 718 mechanical properties: (at 20 ℃ minimum detection of mechanical properties)

Heat treatment methods

Tensile strength σb / MPa

Yield strength σp0.2 / MPa

Elongation rate σ5 /%

Brinell hardness HBS

Solution treatment

965

550

30

≥363

Inconel 718 Production Executive Standard:

Standard

Bar

Forgings

Plate (with) material

Wire

Pipe

American Society for Testing and Materials

ASTM B637

ASTM B637

ASTM B670
ASTM B906

American Aerospace Materials Technical Specification

AMS 5662
AMS 5663
AMS 5664

AMS 5662
AMS 5663
AMS 5664

AMS 5596
AMS 5597

AMS 5832

AMS 5589
AMS 5590

American Society of Mechanical Engineers

ASME SB637

ASME SB637

Inconel 718 microstructure:
The standard heat treatment of the organization of the alloy from the gamma matrix γ ', γ', δ, NbC phase composition
Inconel 718 process performance and requirements:
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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