Untersuchungen zur gezielten Beeinflussung der lokalen Eigenschaften von Eisengusswerkstoffen mittels 3D-gedruckter Kerne

Translated title of the contribution: Investigations on the specific influence of the local properties of cast iron materials by means of 3D-printed cores

Maximilian Brait

Research output: ThesisMaster's Thesis

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Abstract

Lightweight design concepts demand a constant pursuit of materials with excellent mechanical casting properties associated with economical manufacturing processes. It is of great importance to influence and predict local microstructure and its properties, especially in topology optimization. The main focus of this work is the possibility to influence local properties selectively with 3D printed cores. A trial casting with internal core and different wall thicknesses was constructed, simulated, calculated by casting technique and poured. The use of 3D-printed cores and targeted cooling measures locally influenced microstructures. With simple compressed air cooling, an increase in strength of more than 70% in the cast state was achieved, without additional heat treatment. By exact control of the local cooling, high strengths in combination with good tension properties can be combined in one component and high heat treatment costs can be avoided. Using recorded cooling curves, the boundary conditions in the simulation were adapted and more accurate predictions of the expected local properties were made. The knowledge gained in the experiments forms the basis for the design and topology optimization of real components, using local cooling rates and microsructure properties of cast iron materials.
Translated title of the contributionInvestigations on the specific influence of the local properties of cast iron materials by means of 3D-printed cores
Original languageGerman
QualificationDipl.-Ing.
Awarding Institution
  • Montanuniversität
Supervisors/Advisors
  • Schumacher, Peter, Supervisor (internal)
Award date25 Oct 2019
Publication statusPublished - 2019

Bibliographical note

no embargo

Keywords

  • Spheroidal graphite cast iron
  • structural properties
  • cooling rate
  • printed cores

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