Installationsföreläsning för adjungerad professor vid Material och Tillverkning IMS - Håkan Brodin (Siemens Energy)

Abstract
Additive manufacturing has so far found its use in certain application areas such as medical implants, aerospace components, spare parts in the oil and gas industry and for industrial gas turbines. The latter application involves manufacturing of components in alloys, typically nickel- or cobalt based, that can be difficult or even impossible to weld unless certain actions and measures are taken. The components are subject to extreme loading conditions in terms of temperature and mechanical load whilst surviving gas turbine operation up to five years without failure. For production of gas turbine hot gas path components (components that typically are exposed to the hot combustion gas) precision casting is traditionally the preferred manufacturing method. If additive manufacturing can be used, the design freedom will enable benefits such as better efficiency with less fuel consumption and lower emissions.
The current talk will address materials and process research questions that have been and need to be considered when implementing a new manufacturing technology. The focus of the talk is towards the industrialization of powder bed fusion – laser beam, an additive manufacturing technique that has been proven to yield a good material quality for readily weldable materials. In industrialization of the powder bed fusion technique, it is, from a materials standpoint, important to include aspects of all steps of the manufacturing chain (Figure 1). Material and the powder properties will of course determine the basic ability to produce components. A combination of modelling and alloy system characterization for printability is needed, especially since small tweaks of existing alloys have gained limited success. However, both the process development for the printer equipment and subsequent post processing e.g., heat treatment must be considered during the alloy development for a successful alloy development and component industrialization.

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