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Advanced Manufacturing: an investigation of the effect of process gases on the magnetic and mechanical properties of maraging 300 steel samples produced by powder bed fusion

Abstract

Additive manufacturing of metallic parts has been expanding as far as defects inherent to the process, which can infer in material's performance, are being managed. The Powder Bed Fusion process is characterized by the successive layers' consolidation through the energy derived from a laser. During the material fusion and layers' structuration, the material is exposed to thermal cycles with high cooling rates that can promote an oxidation reaction through the residual oxygen level present in the process atmosphere. Thus, the gases used in the build chamber have the purpose of protecting the melt pool solidification against other elements (e.g., O2). The gases also have the function of removing possible process' subproducts (fumes, sparks, powder particles) that can remain in the laser beam trajectory and attenuate the material's energy incidence, generating defects on the fabricated part. Several process parameters can change the properties of metallic parts produced by Powder Bed Fusion; however, the effects of using different protection gases and parts' positioning on the build platform for the products' magnetic and mechanical properties still need further investigations. In this context, comprehending the interaction among different gases with different build positions can promote innovative discoveries about the samples' behavior of magnetic and mechanical properties. Tests for the mechanical and magnetic characterization enable evidencing the phenomena in the fabrication context and their correlation with the intricate cause and effect system inherent to the process. Considering the maraging steel 300 relevance for additive manufacturing applications, this project aims to investigate the effects of atmosphere gases on maraging steel 300 parts positioned in different localizations of the build platform of Powder Bed Fusion, mainly regarding the mechanical and magnetic performance. (AU)

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VEICULO: TITULO (DATA)
VEICULO: TITULO (DATA)