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

2020-10-09 14:46:46  News

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 significantly 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. It has a wide range of application prospects in aerospace, biomedical, automotive, abrasive tools and other fields.

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Inconel 625 (IN625) is a nickel-based superalloy. It mainly uses the reliable solution strengthening effect of elements such as molybdenum (Mo) and niobium (Nb) in the Ni-Cr matrix to obtain high-temperature strength and creeps resistance. The corrosion resistance and solderability in the environment are also acceptable. However, due to 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 with subtractive materials. During the machining process, the machine tool wears quickly, and this material Or it isn't easy to control its performance during forging.


As an essential additive manufacturing technology, LPBF provides enormous potential for the production of complex parts. The current research on LPBF forming IN625 alloy mainly focuses on adjusting its structure and properties by changing process parameters and subsequent heat treatment. Because the LPBF process involves complex issues such as metallurgy, physics, chemistry, and thermal coupling, and the matching relationship between process parameters is very complicated, the current IN625 LPBF process parameters are not yet mature. For example, there is often sizeable residual stress in the sample, which leads to cracks. Holes, cracks, inclusions and other defects often appear between layers.


Due to the texture in the LPBF-IN625 alloy, the performance anisotropy of the sample often appears, but sometimes the performance difference between the forming surfaces is not ideal. Besides, non-equilibrium solidification leads to a significant increase in the stable solution limit of the alloy elements in the base metal, making the performance of LPBF parts different from traditional bulk materials. So far, the research on the LPBF of IN625 has mainly focused on the microhardness and tensile properties. At the same time, there are few studies on other important properties such as high-temperature tensile strength, corrosion resistance, and creep properties.


TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years' experience in providing super high-quality chemicals and Nanomaterials. The 3D printing metal powder produced by our company has high purity, sufficient particle size and impurity content. Lower, please contact us if necessary.


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