<p>In this study, tensile test samples of 18Ni-300 maraging steel (MS) were fabricated using selective laser melting (SLM) to investigate the effects of built orientations and post heat treatments on the evolution of the microstructure and the mechanical properties of the samples. The microstructure of the as-fabricated (AF) samples consists of primary α-martensite phase and fine cellular microstructure with the retained austenite γ-phase aggregated at the boundaries of the cells, resulting in an enhanced mechanical performance compared with traditional counterparts under the same condition (without post-heat treatments). Random grain orientations with weak textures are revealed in all as-built samples. The XY-built samples display better tensile performance when compared to the Z-built samples due to the fine grain sizes and retained γ phase. With heat-treatment, the microstructure can be homogenized. Equiaxed grains are revealed within the samples, and the mechanical properties have been significantly improved, even superior to the conventional counterparts. However, the ductility of the hardened samples is lower than the traditional counterparts.</p><p>&nbsp;</p>

Microstructure and Mechanical Properties of 18ni-300 Maraging Steel Fabricated by Selective Laser Melting

Paper Proceedings: https://asmedigitalcollection.asme.org/MSEC/MSEC2021/volume/85062

2021 International Manufacturing Science and Engineering Conference (MSEC2021)

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