Abstract
This paper focuses on the precipitates found in the 300 grade maraging steel built by Selective Laser Melting (SLM), which is globally one of the fastest-growing Additive Manufacturing (AM) technology. The test samples were built layer by layer via full melting and rapid solidification of the deposited powder bed of 300 grade maraging steel, using an M2 Concept Laser machine. The samples were aged at 510 °C for 2 h, and then air-cooled. Optical microscopy, scanning electron microscopy, transmission electron microscopy, atom probe tomography, and hardness testing were used. No precipitates were found in the structure of the as-built samples. However, for the heat-treated samples, two distinct phases with three different morphologies were detected. These phases were as follow: spherical and plate-like precipitates enriched in Ti and Ni with considerable amounts of Mo, and spherical precipitates enriched in Mo of Fe7Mo6 stoichiometry.
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