Traditionally, Inconel 718 has been produced through vacuum induction melting. However, it has become increasingly popular in the additive manufacturing field. It is used in a variety of engineering applications, including aero engines and liquid fueled rocket components. Its excellent fatigue strength and corrosion resistance make it suitable for these applications.

In order to analyze the shape, morphology and physico-chemical properties of four states of Inconel 718 powder, FESEM was used. Optical microscopy was also used to examine internal porosity and defects. The images were processed with ImageJ 1.53a software and SEM/BSE to calculate the particle-size distribution.

The results showed that the hardness of the powder particles did not significantly vary between the powder states. The average hardness of the particles is within the range of 240-250 HV. This value is characteristic of annealed Inconel 718 and statistically insignificant.

The results show that the average density of the powder is 60%. The bulk density is measured in grams per cubic meter. The apparent density is measured according to the ASTM B212 standard. The tapped density is calculated by dividing the weight of the powder in the cup by its volume.

The rheological tests include shear test, variable flow rate test, stability test, and wall friction test. The results show that the virgin Inconel powder has good flowability. It is recommended to further optimize the powder for better flowability.

The results also show that the hardness and the tensile strength of the powder are good. These properties indicate that the current Inconel powder is acceptable for 3D printing. The yield strength of the powder reduces when it is subjected to higher temperatures.

tags: Semiconductors semiconductor industry