The Effect of Heat Treatment on the Structure and Mechanical Properties of IN718 Manufactured by Laser Melting in Selected Areas

(The Effect of Heat Treatment on the Structure and Mechanical Properties of IN718 Manufactured by Laser Melting in Selected Areas)

The unique alloy composition design of IN718 makes it have good comprehensive
properties, namely higher strength, creep resistance and fatigue life, good
ductility, excellent oxidation resistance, especially under 650℃, its mechanical
properties Has good stability. Many parts of modern aero-engines, such as
turbine discs, blades, brakes, shafts, stators, seals, supports, pipes,
fasteners, etc., are all made of IN718.

The structure and mechanical properties of IN718 manufactured by selective
laser melting are determined by IN718 pre-alloyed powder. Four cylindrical
specimens with high density (99.8%) in different manufacturing directions were
manufactured, and their manufacturing directions were respectively 0 degree, 45 degree,
45degree*45degree, and 90° to the scanning direction. Due to the directional growth of
cellular dendrites, the typical structure of the deposited samples is
supersaturated columnar dendrites and segregation of Nb and Mo elements inside.
This diversified structure is not suitable for direct aging treatment of
deposited samples, and it also makes the alloy too sensitive to the
solid-liquid-liquid temperature that is rapidly heated to the homogenization
temperature.

Compared with forged materials, the alloy can obtain a series of better
mechanical properties when the deposited samples are in a homogenized and aging
state. The anisotropic properties of the material in the deposited state are
weaker, which is manifested in that the material has a lower Young's modulus,
yield strength and tensile strength in the manufacturing direction compared with
the heat-treated state. This is because the crystal grains maintain the geometry
and crystal texture formed during solidification.

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(The Effect of Heat Treatment on the Structure and Mechanical Properties of IN718 Manufactured by Laser Melting in Selected Areas)