In the context of "270065-1 SE Seminar für Physikalische Chemie und Materialchemie (2021S)":

On the influence of process parameters on properties of additively manufactured metallic alloys

Prof. Dr. Thomas Niendorf, Institut für Werkstofftechnik, Metallische Werkstoffe, Universität Kassel, Deutschland, https://www.uni-kassel.de/forschung/cinsat/ueber-cinsat/mitglieder/metallische-werkstoffe 

Additive manufacturing (AM) enables the realization of components with unprecedented geometric complexity. Due to the special characteristics of the AM processes, i.e. rapid solidification and intrinsic heat treatment, virtually new materials can be produced. It is of utmost importance that the geometry and microstructure of a certain component / material are established at the same time. Thus, in-depth knowledge of the relationships between process, geometry, microstructure and properties is of crucial importance.

The assessment of the process-structure-property relationships of various metallic alloys, which were processed using powder bed AM techniques, is the focus of the present work. Based on experimental investigations it is revealed that the specific properties of AM processes must be taken into account when the local geometry of a component is changed significantly. The presented work, thus, spans the whole range from the general fundamentals of AM to specific properties of appropriately processed alloys, such as the damage behavior under cyclic loading.

Design and optimization of alloys for additive manufacturing

Dr. Christian Leinenbach, EMPA Dübendorf, https://www.empa.ch/web/s204/christian-leinenbach

In the last couple of years, metal additive manufacturing (AM) has emerged from a mere prototyping technology to a real manufacturing technology with applications in many industry sectors (e.g. aerospace, biomedical engineering, power generation). The layer-by-layer consolidation during laser powder bed fusion or laser direct metal deposition results in unique time-temperature profiles in the materials, which can lead to out-of-equilibrium microstructures, meta-stable phases, micro-segregation and cracking. Up until now, only a small number of conventional alloys is currently used for AM. Many traditional wrought and cast alloys were not optimized for processing via AM and they might have to be optimized to make them printable. On the other hand, the special processing conditions during AM with the very rapid heating and cooling cycles and the short consolidation times can allow for the fabrication of alloys and composites that are otherwise difficult or impossible to fabricate.

In this presentation, I will talk about the material challenges in metal AM and our activities with regard to the design and optimization of structural alloys for laser-based AM technologies. In addition, I will talk about our approaches to use AM for fabricating parts with locally tailored microstructures and novel functionalities.

Meeting link:

https://univienna.zoom.us/j/94949341126?pwd=TVZ3d2w0elZRalZxMnlsaVN6eGE3UT09

Meeting ID: 949 4934 1126

Code: 652558