Research Progress of Laser Powder Bed Melting Forming Inconel625 Nickel-based Alloy

(Research Progress of Laser Powder Bed Melting Forming Inconel625 Nickel-based Alloy)

Additive manufacturing, also known as 3D printing, is an advanced
manufacturing technology developed in the past 30 years. In theory, additive
manufacturing technology can transform any CAD model into a physical entity,
which greatly increases the geometric design freedom and manufacturing
capabilities of complex parts.

For metals, laser powder bed melting (LPBF) mainly uses high-energy laser
beams to melt preset thin layers of metal powder layer by layer, which can form
high-performance parts after solidification and cooling. It is one of the most
promising additive manufacturing technologies. one. This technology is
especially suitable for the forming and processing of small-batch,
high-precision, personalized, and complex structure parts, and has a wide range
of application prospects in the fields of aerospace, biomedicine, automobiles,
and abrasive tools.

Most of the Ni-based alloys formed by LPBF have obvious anisotropy, most of
the grains grow along the <100> direction, and a large number of fine
grains are distributed at the boundary of the molten pool, and the texture
presents a typical {100}<001> type Cube texture. The grain growth
direction of the formed part is closely related to the scanning strategy. When
the cross scanning method is adopted, the fastest grain growth direction
<100> is perpendicular to the forming substrate; when the unidirectional
scanning is adopted, the grain growth direction is 60% to the forming direction.
When the laser point light source moves, the heat flow direction is not
completely symmetrical to the growth direction.

Inconel 625 (IN625) is a nickel-based superalloy, which mainly uses the solid
solution strengthening effect of elements such as molybdenum (Mo) and niobium
(Nb) in the Ni-Cr matrix to obtain high-temperature strength and creep
resistance. The corrosion resistance and solderability in the environment are
also good. However, because of its high hardness, low thermal conductivity and
high work hardening rate, IN625 is considered to be an alloy that is difficult
to process or is difficult to manufacture from subtractive materials. During the
machining process, the machine tool wears quickly, and this material Or it is
difficult to control its performance during forging.

Characterize the macroscopic defects and microstructures of IN625 alloy
as-cast and post-treatment, and deeply explore the formation mechanism of
macroscopic defects (pores, microcracks, spheroidization, unmelted zone) and the
evolution mechanism of microstructure (grain boundaries, second Phase,
dislocation, sub-grain boundary, stacking fault, etc.)

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(Research Progress of Laser Powder Bed Melting Forming Inconel625 Nickel-based Alloy)