Analysis of the influence of different height during 3D printing on parts from MS1 maraging steel before and after heat treatment

Jirková Hana - University of West Bohemia (Czech Republic)

Additive technologies are currently a fast-growing industry that finds application in various industries. With appropriately designed print parameters, including suitably located supports, it is possible to produce complex shape components. To obtain components with the required mechanical properties, it is necessary to perform heat treatment after 3D printing. After the heat treatment, not only the required structure is achieved but also the internal stress is removed. One factor that must also be taken into account during the design process is the height of the individual components placed on the platform. The different height of some parts leads to the formation of a significant transition that is evident during metallographic observation.

From the powder of MS1 maraging steel, the part significantly higher than the others was printed on a platform. The printing was performed by direct metal sintering (DMLS). The metallographic evaluation of the printed part was carried out, including hardness profiles. This was followed by solution annealing at different holding times. The results showed that annealing at 820 °C leads to the removal of the transition on the separately printed part and eliminates the step change of properties caused by printing concentrated on only one component.

Keywords: 3D printing, maraging steel, annealing

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