Einschlusscharakterisierung über die Prozessstufen des Additive Manufacturing eines PH - Stahls

Research output: ThesisMaster's ThesisResearch

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Abstract

In the last decades, Additive Manufacturing developed from a pure prototype - production - process to a manufacturing technology for functional components. The evolution lead to a high variety of processes with a digital data set as common ground. Differences compared to traditional manufacturing process are shown by a vertical, layer by layer component set up consuming raw material as well as regulated amounts of energy. In this Master Thesis, samples provided by a steel producer are investigated. The specimens come from different steps of the process chain - raw material/powder/printed component. Raw material consumed by the atomization process was taken out of three different production routes for semi-finished goods (VIM, VIM + DESU, VIM + VAR). The investigated powder was produced by a close couple gas atomization (CCGA) and the printed sample was made by selective laser melting (SLM). Results show that the analyzed material as well as the atomization and printing process investigated in this thesis are not able to conserve advantages concerning steel cleanness generated by additional remelting over the whole process route. The atomization minimizes the sulfide and nitride inclusion content in consequence of the high cooling rate whereas the content of oxygen increases. During 3D printing oxide modification is forced towards thermodynamic equilibrium. In addition, inclusions get bigger and are concentrated on the edge of the single welding lines.

Details

Translated title of the contributionCharacterization of inclusions in different process steps of an additive manufactured PH - steel
Original languageGerman
QualificationDipl.-Ing.
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Award date19 Oct 2018
Publication statusPublished - 2018