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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